TY - GEN
A1 - Friedrich, Jörg Florian
A1 - Kühn, Gerhard
A1 - Mix, Renate
A1 - Retzko, Iris
A1 - Gerstung, Vanessa
A1 - Weidner, Steffen
A1 - Schulze, Rolf-Dieter
A1 - Unger, Wolfgang
ED - Mittal, K. L.
T1 - Plasma polymer adhesion promoters for metal-polymer systems
T2 - 2nd International Symposium on Polyimides and Other High Temperature Polymers: Synthesis, Characterization and Applications
CY - Newark, NJ, USA
DA - 2001-12-03
KW - r.f. pulsed plasma
KW - Plasma polymers with functional groups
KW - Copolymers
KW - Adhesion promoting interlayers
KW - Metal-polymer systems
PY - 2003
SN - 90-6764-378-5
VL - 2
SP - 359
EP - 388
PB - VSP
CY - Utrecht
AN - OPUS4-6967
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Ghode, Archana
A1 - Kühn, Gerhard
A1 - Weidner, Steffen
A1 - Geng, Shiming
A1 - Retzko, Iris
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
ED - Schindel-Bidinelli, E.
T1 - Polymeroberflächenfunktionalisierungen im gepulsten Plasma mit nachfolgender chemischer Behandlung
T2 - 14. Internationales Symposium Swissbonding ; 14. Internationaler Kongreß Swiss Bonding ; 14th Swiss Bonding 00
CY - Rapperswil, Schweiz
DA - 2000-05-16
PY - 2000
SP - 31
EP - 44
PB - SWIBOTECH GmbH
CY - Bülach
AN - OPUS4-6980
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
A1 - Weidner, Steffen
A1 - Geng, Sh.
A1 - Wigant, L.
A1 - Wöll, Ch.
A1 - Erdmann, J.
A1 - Gorsler, H.-V.
T1 - Characterization of plasma-modified organic surfaces by electron spectroscopy, SEIRA, and MALDI-TOF-MS
T2 - 6th European Conference on Applications of Surface and Interface Analysis
CY - Montreux, Switzerland
DA - 1995-10-09
PY - 1995
SP - TC 11
PB - Wiley
CY - Chichester
AN - OPUS4-7001
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MassChrom2D - a software that combines chromatographic separation and mass spectrometric identification to analyze the composition of copolymers
T2 - 60th ASMS Conference on Mass Spectrometry and Allied Topics
CY - Vancouver, Canada
DA - 2012-05-20
PY - 2012
AN - OPUS4-25954
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI - Untersuchung zur Oberflächenmodifizierung von Polymeren nach Plasmabehandlung
T2 - 4. MALDI-Anwendertreffen (Shimadzu)
CY - Duisburg, Germany
DA - 1997-11-26
PY - 1997
AN - OPUS4-11280
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Just, Ulrich
A1 - Werthmann, Barbara
A1 - Weidner, Steffen
T1 - Referenzmaterialien für die Polymeranalytik - Verfahren zur Charakterisierung und Bewertung
PY - 1998
SN - 0943-6677
VL - 49
IS - 6
SP - 223
EP - 228
PB - Rubikon
CY - Gaiberg bei Heidelberg
AN - OPUS4-11261
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Weidner, Steffen
T1 - Rezension: Kompakte Zusammenfassung - MALDI-TOF Mass Spectrometry of Synthetic Polymers. Von H. Pasch, W. Schrepp. Springer, Heidelberg 2003, 298 Seiten. geb., 79,95 Euro. ISBN 3-540-44259-6
PY - 2003
DO - https://doi.org/10.1002/nadc.20030511123
SN - 1439-9598
SN - 1521-3854
VL - 51
IS - 11
SP - 1173
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-4678
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Sample spot heterogeneity investigated by MALDI-imaging mass spectrometry
T2 - 18th International Mass Spectrometry Conference
CY - Bremen, Germany
DA - 2009-08-30
PY - 2009
AN - OPUS4-19989
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Identification of End Group Heterogeneity of Modified Polyamide 6.6 utilizing Two-Dimensional Chromatography/MALDI-MS
T2 - 51st ASMS Conference
CY - Montreal, Canada
DA - 2003-06-08
PY - 2003
AN - OPUS4-4655
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MassChrom2D zur Bestimmung der Zusammensetzung von Copolymeren aus MALDI und LC Daten
T2 - 16. Kolloquium MALDI und Synthetische Polymere
CY - Berlin, Germany
DA - 2012-05-08
PY - 2012
AN - OPUS4-26135
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Lauer, Franziska
A1 - Seifert, Stephan
A1 - Kneipp, Janina
A1 - Weidner, Steffen
T1 - Simplifying the preparation of pollen grains for MALDI-TOF MS classification
N2 - Matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) is a well-implemented analytical technique for the investigation of complex biological samples. In MS, the sample preparation strategy is decisive for the success of the measurements. Here, sample preparation processes and target materials for the investigation of different pollen grains are compared. A reduced and optimized sample preparation process prior to MALDI-TOF measurement is presented using conductive carbon tape as target. The application of conductive tape yields in enhanced absolute signal intensities and mass spectral pattern information, which leads to a clear separation in subsequent pattern analysis. The results will be used to improve the taxonomic differentiation and identification, and might be useful for the development of a simple routine method to identify pollen based on mass spectrometry.
KW - MALDI
KW - Conductive carbon tape
KW - Pollen
KW - Sample pretreatment
KW - Principal component analysis
PY - 2017
DO - https://doi.org/10.3390/ijms18030543
SN - 1422-0067
SN - 1661-6596
VL - 18
IS - 3
SP - 543-1
EP - 543-11
PB - MDPI
AN - OPUS4-41733
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Polymer characterization using sophisticated liquid chromatographic techniques combined with MALDI- and ESI-TOF mass spectrometry
T2 - 55th ASMS conference on Mass Spectrometry
CY - Indianapolis, IN, USA
DA - 2007-06-03
PY - 2007
AN - OPUS4-14745
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-MS zur Aufklärung des Mechanismus der homogen katalysierten Polymerisation flüssigkristalliner Seitengruppenmethacrylate
T2 - III. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren"
CY - Berlin, Germany
DA - 1999-05-17
PY - 1999
AN - OPUS4-11301
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - UV- und IR-MALDI-TOF-MS zur Bestimmung von Molmasse und chemischer Heterogenität von synthetischen Polymeren
T2 - 4. Deutsches Bruker Daltonik MALDI-TOF-MS Anwendertreffen
CY - Fulda, Germany
DA - 1999-04-15
PY - 1999
AN - OPUS4-11282
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-MS zur Charakterisierung der Oligomeren nach hydrolytischem und plasmachemischem Abbau von Polymeren
T2 - I. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren"
CY - Berlin, Germany
DA - 1997-06-02
PY - 1997
AN - OPUS4-11276
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF-MS of low-molar mass polyethylene and waxes
T2 - 49th Conference of the American Society of Mass Spectrometry
CY - Chicago, IL, USA
DA - 2001-05-25
PY - 2001
AN - OPUS4-11302
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Erste Untersuchungen zur Infrarot-MALDI-MS von Polymeren
T2 - II. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren"
CY - Berlin, Germany
DA - 1998-05-04
PY - 1998
AN - OPUS4-11281
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF-MS zur Analytik von synthetischen Polymeren
T2 - Seminar zur Makromolekularen Chemie im SS 1999, TU Berlin, AK Prof. Springer
CY - Berlin, Germany
DA - 1999-11-13
PY - 1999
AN - OPUS4-11300
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Mechanism of homogeneously catalyzed polymerization of liquid-crystalline sidegroup monomers investigated by means of MALDI-TOF-MS (No. 433)
T2 - 219th ACS National Meeting
CY - San Francisco, CA, USA
DA - 2000-03-26
PY - 2000
AN - OPUS4-11314
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Modifizierung plasmabehandelter Polyolefinoberflächen mit kovalent gebundenen Funktionsmolekülen
T2 - Workshop "Medicine meets Material", TEMA Berlin, Institut für Nichtmetallische Werkstoffe der TU Berlin
CY - Berlin, Germany
DA - 1999-01-29
PY - 1999
AN - OPUS4-11312
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Determination of molecular mass and molecular mass distribution of polymers by matrixassisted laser desorption/ionization - time of fightmass spectrometry (MALDI TOF MS)
T2 - ISO TC 61/SC 5 Meeting
CY - Yokohama, Japan
DA - 2006-09-18
PY - 2006
AN - OPUS4-13822
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF mass spectrometry for the analysis of synthetic polymers
T2 - eingelad. Vortrag im National Institute for Advanced Industrial Science and Technology (AIST)
CY - Tsukuba, Japan
DA - 2006-09-14
PY - 2006
AN - OPUS4-13827
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-ToF mass spectrometry for the characterization of biobased polymers suitable for depollution
N2 - In this work, bio-based polymers were synthesized and designed as polymers phases for adsorption of a variety of pollutants from aqueous solutions. The obtained adsorption results showed that the integration of bio-sourced synthons generate attractive hydrophilicity, and wettability of the resulting adsorbent phase. Such polymers phases enable stronger interactions with the organic and inorganic pollutants in water.
A wide variety of different bio-based polymers structures (e. g. poly(ethersulfones, poly(etherphosphines or poly(etherpyridines) with different functional groups were successfully designed in order to adapt chemical structure to different pollutants type and matrice nature.
In order to characterize and to determine the correlation between polymer structures and nature of interaction with pollutants, different analytical technics (NMR, GPC, ATG, DSC, Mass spectrometry) were successfully used. Amongst them, MALDI TOF mass spectrometry plays a superior role since this technique enables the simultaneous determination of the polymer structure, polymer end groups and molecular weight.
This work focusses on the characterization of synthesized polymers. The chemical structure of the repeating unit, the nature of the end groups, as well as the molecular weight, which are all important for the specific interactions of the polymer with the pollutants were clearly determined and suggestions to improve these interactions by changing the synthetic pathway could be given.
T2 - 12. Journees maghreb-europe. Matériaux et Applications aux Dispositifs et Capteurs
CY - Monastir, Tunisia
DA - 08.11.2022
KW - MALDI TOF MS
KW - Biobased polymers
KW - Depollution
PY - 2022
AN - OPUS4-56237
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF MS und MALDI-MSI zur Identifikation und Klassifizierung von Pollen
N2 - Es werden die letzten Ergebnisse präsentiert, die es ermöglichen, einzelne Pollenkörner unterschiedlicher Arten in Mischungen mittels MALDI-TOF Massenspektrometrie bzw. MALDI-TOF Imaging zu messen und unter Zuhilfenahme multivariater Auswertemethoden zu klassifizieren.
T2 - 24. Bruker MALDI Anwendertreffen
CY - Leipzig, Germany
DA - 18.02.2019
KW - MALDI-TOF Massenspektrometrie
KW - Pollenkörner
KW - Klassifizierung
KW - MALDI Imaging
KW - Multivariate Analyse
PY - 2019
AN - OPUS4-47441
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Falkenhagen, Jana
A1 - Krüger, Ralph-Peter
A1 - Much, Helmut
A1 - Schulz, Günter
A1 - Weidner, Steffen
ED - Grellmann, W.
T1 - Characterization and identification of new polymer structures by optimization and coupling of HPLC and MALDI-TOF-MS
T2 - Polymerwerkstoffe 2000
CY - Halle (Saale), Germany
DA - 2000-09-25
PY - 2000
SN - 3-86010-605-8
PB - Martin-Luther-Univ.
CY - Halle
AN - OPUS4-2250
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Beispiele für zweidimensionale Kopplungen von Chromatographie und MALDI-TOF-Massenspektrometrie zur Analyse von Polymeren
T2 - BAM-Abt. VI-Seminar
CY - Berlin, Germany
DA - 2003-09-25
PY - 2003
AN - OPUS4-11139
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Phasenverhalten Cholesterin enthaltender Seitengruppenpolymere
T2 - TU Berlin, AK Prof. Springer
CY - Berlin, Germany
DA - 1995-11-13
PY - 1995
AN - OPUS4-11275
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI Mass spectrometry of synthetic polymers – making molecular elephants to fly
N2 - The importance of MALDI TOF mass spectrometry for the analysis of synthetic polymers is shown and some specific issues influencing the analysis e.g. polymer mass dispersity, matrix and matrix homogeneity, nature of cations and end groups, sequence distribution are discussed by means of examples.
T2 - Merck Polymer Seminar
CY - Online meeting
DA - 29.04.2021
KW - MALDI-ToF MS
KW - Ionization
KW - Desorption
KW - Polymers
PY - 2021
AN - OPUS4-52545
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - LC-MALDI Coupling for "quantitative" Analysis of Polymers
T2 - NIST
CY - Gaithersburg, MD, USA
DA - 2002-11-06
PY - 2002
AN - OPUS4-11138
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Sötebier, Carina
A1 - Weidner, Steffen
A1 - Jakubowski, Norbert
A1 - Panne, Ulrich
A1 - Bettmer, J.
T1 - Separation and quantification of silver nanoparticles and silver ions using reversed phase high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry in combination with isotope dilution analysis
N2 - A reversed phase high performance liquid chromatography coupled to an inductively coupled plasma mass spectrometer (HPLC-ICP-MS) approach in combination with isotope dilution analysis (IDA) for the separation and parallel quantification of nanostructured and ionic silver (Ag) is presented. The main focus of this work was the determination of the ionic Ag concentration. For a sufficient stabilization of the ions without dissolving the nanoparticles (NPs), the eluent had to be initially optimized. The determined Ag ion concentration was in a good agreement with results obtained using ultrafiltration. Further, the mechanism of the NP separation in the HPLC column was investigated. Typical size exclusion effects were found by comparing results from columns with different pore sizes. Since the recovery rates decreased with increasing Ag NP size and large Ag NPs did not elute from the column, additional interactions of the particles with the stationary phase were assumed. Our results reveal that the presented method is not only applicable to Ag NPs, but also to gold and polystyrene NPs. Finally, IDA-HPLC-ICP-MS experiments in single particle mode were performed to determine the particle cut-off size. The comparison with conventional spICP-MS experiments resulted in a similar diameter and particle size distribution.
KW - ICP-MS
KW - Silver nanoparticles
KW - HPLC
KW - Isotope dilution analysis
KW - Field flow fractionation
KW - Toxicology
PY - 2016
DO - https://doi.org/10.1016/j.chroma.2016.09.028
SN - 0021-9673
VL - 1468
SP - 102
EP - 108
PB - Elsevier B.V.
AN - OPUS4-38642
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Just, Ulrich
A1 - Weidner, Steffen
A1 - Wittke, Wolfgang
A1 - Friedrich, Jörg Florian
A1 - Rittig, F.
A1 - Gruber, F.
T1 - 2D-Characterization of Polyamides using Chromatography and MALDI-TOF-MS
T2 - Waters International GPC 2003 and ISPAC-16-Symposium
CY - Baltimore, MD, USA
DA - 2003-06-09
PY - 2003
AN - OPUS4-2631
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF MS in der Synthese hochmolekularer Polylaktid Homo- und Copolymere
N2 - Die MALDI-TOF Massenspektrometrie stellt eine wichtige Methode zur simultanen Bestimmung von Molmassen, Molmassenverteilungen und Endgruppen von synthetischen Polymeren dar. In dem Vortrag wird gezeigt, welche zusätzlichen Informationen über die Art der Polymerisation, der Nebenreaktionen und der Topologie der gebildeten hochmolekularen Polylaktid-Homo- und Copolymere im Verlauf ihrer Synthese erhalten werden können.
T2 - Bruker Anwendertreffen
CY - Online meeting
DA - 05.03.2021
KW - MALDI
KW - Polylaktide
PY - 2021
AN - OPUS4-52278
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Hoskins, Jessica
A1 - Falkenhagen, Jana
A1 - Weidner, Steffen
ED - Udomkichdecha, W.
ED - Böllinghaus, Thomas
ED - Manonukul, A.
ED - Lexow, J.
T1 - Characterization of randomly branched polymers utilizing liquid chromatography and mass spectrometry
N2 - Branching in polymers is an important way to modify the materials properties, however the characterization of random branching in polymeric materials is a challenge in polymer analysis. In this work, liquid adsorption chromatography methods are developed for a commercially available hyperbranched polyester (Boltorn™). This Chromatographie techniques was then coupled to offline MALDI-TOF MS analysis, a first in the analysis of randomly branched polymers. The coupling of these two techniques provides superior MALDI-TOF spectra, enabling the easy identification of structural subdistributons based on theoretical molecular weight. Detailed analysis of the MALDI-TOF spectra shows that these Chromatographie conditions separate cyclic Boltorn polymers (with no core molecule) from non-cyclic polymers (with core molecule), and these are the only two architectures observed. MALDI MS also confirms that the Chromatographie Separation mode is adsorption, but further analysis is needed to determine if there is a Separation by degree of branching.
KW - Hyperbranched polyesters
KW - Polymer mass spectrometry
KW - Polymer chromatography
KW - Liquid adsorption chromatography
KW - MALDI-TOF MS
KW - Carbon capture
KW - Climate change
KW - Lubricant
KW - Micro manufacturing
KW - Multiphysics simulations
KW - WMRIF
PY - 2014
SN - 978-3-319-11339-5
SN - 978-3-319-11340-1
SP - 1
EP - 10
PB - Springer
AN - OPUS4-32519
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI Imaging MS von Polymeren
T2 - BRUKER-Anwendertreffen
CY - Kassel, Germany
DA - 2011-03-21
PY - 2011
AN - OPUS4-23603
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kricheldorf, H. R.
A1 - Weidner, Steffen
A1 - Meyer, A.
T1 - About the Influence of (Non-)Solvents on the Ring Expansion Polymerization of l-Lactide and the Formation of Extended Ring Crystals
N2 - Ring-expansion polymerizations (REPs) catalyzed by two cyclic tin catalysts (2-stanna-1.3-dioxa-4,5,6,7-dibenzazepine [SnBiph] and
2,2-dibutyl-2-stanna-1,3-dithiolane [DSTL]) are performed at 140 °C in bulk.
Small amounts (4 vol%) of chlorobenzene or other solvents are added to
facilitate transesterification reactions (ring–ring equilibration) in the solid poly(l-lactide)s. In the mass range up to m/z 13 000 crystalline PLAs displaying a so-called saw-tooth pattern in the MALDI-TOF mass spectra are obtained indicating the formation of extended-ring crystals. The characteristics of extended-ring crystallites and folded-ring crystallites are discussed. Furthermore, extremely high melting temperatures (Tm’s up to 201.2 °C) and melting enthalpies (𝚫Hm’s up to 106 J g−1)) are found confirming that 𝚫Hm max, the 𝚫Hm of a perfect crystal, is around or above 115 J g−1 in contrast to literature data.
KW - Polylactide
KW - MALDI-TOF MS
KW - Ring-expansion polymerization
KW - Biobased
PY - 2023
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-573063
DO - https://doi.org/10.1002/macp.202200385
VL - 224
IS - 5
SP - 1
EP - 8
PB - Wiley VHC-Verlag
AN - OPUS4-57306
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Differences in MALDI Ionization of neat linear and cyclic poly(L-lactide)s
N2 - In addition to molar mass distribution (MMD) synthetic polymers often exhibit an additional chemical heterogeneity distribution, expressed by different end groups and other structural variations (e.g. tacticity, copolymer composition etc.). Ionization in MALDI MS is always strongly affected by such chemical properties. For example, the abundance of cyclics in MALDI TOF mass spectra is frequently reported to greatly exceed that of linears. Thus, the MALDI ionization behavior of various neat end-capped linear poly(L-lactide)s and one cyclic poly(L-lactide) was investigated and compared with that of blends of both structures. Moreover, the influence of the cationizing salt was investigated too.
Neat compounds and various blends of cyclic and linear species were prepared and studied using two MALDI TOF mass spectrometers under identical conditions with regard to sample preparation and instrumental conditions, except for the laser power and the salt used for cationization. Polymer samples were additionally characterized by NMR and SEC.
The steady increase of the laser intensity caused an exponential increase of the peak intensities of both linear and cyclic polylactides.The response of linear polylactides (in the investigated molecular mass range), whether as neat polymer or in blends with other linear polylactides was almost similar. This clearly supports our assumption that ionization in MALDI is probably unaffected by the end group structure.The variation of the laser power shows only little effect on the intensity ratio of linear-to linear and cyclic-to-linear polylactides in blends. Whereas neat linear polylactides at all laser intensities have a significantly higher abundance than neat cyclics, in mixtures of both an overestimation of cyclic species in MALDI TOF mass spectra of polylactides was found. However, this is far less distinct than frequently reported for other polymers.Concluding, peak suppression of linear polymers in mixtures of both architectures can be excluded, which also means, that polylactides showing only peaks of cyclic compounds in their MALDI - TOF mass spectra do not contain a significant fraction of linear analogues.
Our study is the first systematic comparison of the MALDI ionization of neat and blended cyclic and linear polylactides.
T2 - ASMS 2020 Reboot
CY - Online meeting
DA - 01.06.2020
KW - MALDI
KW - Ionization
KW - Linear
KW - Cyclic
KW - Polylactide
PY - 2020
AN - OPUS4-50852
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Polymer mass spectrometry at BAM with special emphasis on MALDI and ESI
N2 - Since its introduction mass spectrometric techniques like Matrix-assisted Laser Desorption/ionization (MALDI) and Electrospray Ionization (ESI) have become indispensable for synthetic polymer analyses. Ideally, various polymer properties (monomer structure, masses, mass distribution, end groups) can be determined simultaneously. However, in real life these experiments are always affected by important structural parameters and instrumental limitations.
A short introduction focussing on latest findings with respect to ionisation principles and mechanisms will be given. Recent results from our group will be presented and efforts to avoid common drawbacks of polymer mass spectrometry will be discussed. In this regard, MALDI - Imaging mass spectrometry and the 2D hyphenation of MS with different chromatographic separation techniques were especially useful, since they can provide additional information and reduce the complexity of polymer analyses.
T2 - 21. European Symposium on Polymer Spectroscopy
CY - Linz, Austria
DA - 13.01.2020
KW - Mass spectrometry
KW - MALDI-TOF MS
KW - ESI-TOF MS
KW - Polymer
PY - 2020
AN - OPUS4-50260
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF Massenspektrometrie von Polymeren - Anwendungen, Probleme, Trends
T2 - Kolloquium zum Thema "Untersuchungen von synthetischen bzw. Biopolymeren mit MALDI-TOF-MS"
CY - Dresden, Germany
DA - 2009-12-10
PY - 2009
AN - OPUS4-20151
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Krüger, Rita
A1 - Kelm, Jürgen
A1 - Kretzschmar, Hans-Jürgen
A1 - Schulze, Dietmar
A1 - Trubiroha, Peter
A1 - Weidner, Steffen
T1 - Eine neue Klasse von Ozonschutzmitteln - verbesserter Ozonschutz durch teilweisen Einbau in die Polymermatrix
T2 - IRC '03 ; International Rubber Conference 2003 ; Internationale Kautschuk-Tagung 2003
CY - Nürnberg, Deutschland
DA - 2003-06-30
PY - 2003
SP - 139
EP - 142
PB - DKG, Dt. Kautschuk-Ges.
CY - Frankfurt, Main
AN - OPUS4-2608
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Gerstung, Vanessa
A1 - Mix, Renate
A1 - Kühn, Gerhard
A1 - Weidner, Steffen
ED - d'Agostino, R.
T1 - Pulsed plasma initiated homo- and copolymerisation - molar masses
T2 - 16th International Symposium on Plasma Chemistry (ISPC-16)
CY - Taormina, Italy
DA - 2003-06-22
PY - 2003
IS - CD-ROM
PB - Dep. of Chemistry, Univ.
CY - Bari
AN - OPUS4-2710
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Zweidimensionale Charakterisierung von PA 6.6 durch Kopplung von LAC und MALDI-MS
T2 - 7. Kolloquium "MALDI und synthetische Polymere"
CY - Berlin, Germany
DA - 2003-05-13
PY - 2003
AN - OPUS4-3094
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Falkenhagen, Jana
A1 - Krüger, Ralph-Peter
A1 - Schulz, Günter
A1 - Weidner, Steffen
T1 - Polymer characterization by LC / MALDI-MS coupling
T2 - Bayreuther Polymer Symposium 2001
CY - Bayreuth, Germany
DA - 2001-09-16
PY - 2001
CY - Bayreuth
AN - OPUS4-2256
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Kühn, Gerhard
A1 - Ghode, Archana
A1 - Weidner, Steffen
A1 - Retzko, Iris
A1 - Unger, Wolfgang
A1 - Friedrich, Jörg Florian
ED - Mittal, K. L.
T1 - Chemically well-defined surface functionalization of polyethylene and polypropylene by pulsed plasma modification followed by grafting of molecules
T2 - 2nd International Symposium on Polymer Surface Modification: Relevance to Adhesion
CY - Newark, NJ, USA
DA - 1999-05-24
KW - Plasma modification
KW - Chemical conversion of functional groups
KW - Spacers
KW - Polypropylene
KW - Polyethylene
PY - 2000
SN - 90-6764-327-0
VL - 2
SP - 45
EP - 64
PB - VSP
CY - Utrecht
AN - OPUS4-6975
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Friedrich, Jörg Florian
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
A1 - Koprinarov, Ivaylo
A1 - Kühn, Gerhard
A1 - Weidner, Steffen
A1 - Vogel, Lydia
ED - Mittal, K.
T1 - Plasma Pretreatment of Polymer Surfaces - Relevance to Adhesion of Metals
T2 - 5th Symposium on Metallized Plastics ; 6th Symposium on Metallized Plastics
CY - Los Angeles, CA, USA
DA - 1996-05-05
PY - 1998
SN - 90-6764-290-8
SP - 271
EP - 293
PB - VSP
CY - Utrecht
AN - OPUS4-6987
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
A1 - Roessner, D.
A1 - Friedrich, Jörg Florian
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
ED - Olefjord, I.
ED - Nyborg, L.
ED - Briggs, D.
T1 - Changes in molecular weight distribution of polymers by plasma treatment
T2 - 7th European Conference on Applications of Surface and Interface Analysis
CY - Göteborg, Sweden
DA - 1997-06-16
PY - 1997
SN - 0-471-97827-2
SP - 795
EP - 799
PB - Wiley
CY - Chichester
AN - OPUS4-6997
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI/MS - A New Technique in Characterizing Chemical Heterogeneity of Degradation Products of Poly(Ethylene Terephthalate)s
T2 - International GPC Symposium '96
CY - San Diego, CA, USA
DA - 1996-09-08
PY - 1996
AN - OPUS4-11125
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-MS - supplementary to chromatographic techniques in characterizing chemical heterogeneity of oligomer ethylene terephthalates
T2 - GdCH - Jahrestagung (Arbeitskreis Chromatographie)
CY - Leipzig, Germany
DA - 1995-11-06
PY - 1995
AN - OPUS4-11119
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Characterization of Technical Waxes using chromatographic techniques and MALDI-MS
T2 - 10th International Conference on Macromolecules
CY - Bratislava, Slovakia
DA - 1995-09-18
PY - 1995
AN - OPUS4-11117
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Neue Wege zur analytischen Charakterisierung komplexer Polymersysteme
T2 - Berliner Polymerentage 2000
CY - Berlin, Germany
DA - 2000-10-09
PY - 2000
AN - OPUS4-11134
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI von geregelten und ungeregelten Polyamiden nach kritischer Chromatographie
T2 - VII. Anwendertreffen MALDI-TOF-MS zur Charakterisierung von synthetischen Polymeren
CY - Berlin, Germany
DA - 2002-05-14
PY - 2002
AN - OPUS4-11136
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Charakterisierung der molekularen und chemischen Heterogenität von Polyoxymethylen (POM)
T2 - BASF
CY - Ludwigshafen am Rhein, Germany
DA - 2005-06-17
PY - 2005
AN - OPUS4-11143
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Beispiele für die Anwendung von MALDI-MS in der Polymeranalytik und zur Untersuchung von plasmamodifizierten Polymeroberflächen
T2 - Hoechst AG, Werk Kalle Albert
CY - Wiesbaden, Germany
DA - 1995-09-25
PY - 1995
AN - OPUS4-11274
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Schulz, Eckhard
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
T1 - Verbesserungen der mechanischen Festigkeiten von Faser-Polymer-Verbundwerkstoffen durch Vorbehandlung der Fasern im Niederdruckplasma
T2 - Vortragsbände des 8. Internationalen Techtextil-Symposiums 1997
CY - Frankfurt am Main, Deutschland
DA - 1997-05-12
PY - 1997
VL - 8
SP - 1(?)
EP - 16(?)
PB - Messe Frankfurt
CY - Frankfurt am Main
AN - OPUS4-7287
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
A1 - Falkenhagen, Jana
A1 - Friedrich, Jörg Florian
A1 - Krüger, Ralph-Peter
A1 - Schulz, Günter
A1 - Much, Helmut
T1 - Liquid Adsorption Chromatography near Critical Conditions of Adsorption coupled with Matrix-assisted Laser/Ionization Mass Spectrometry
T2 - 47th ASMS Conference on Mass Spectrometry and Allied Topics
CY - Dallas, TX, USA
DA - 1999-06-13
PY - 1999
CY - Dallas, Tex
AN - OPUS4-2165
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Falkenhagen, Jana
A1 - Krüger, Ralph-Peter
A1 - Schulz, Günter
A1 - Weidner, Steffen
T1 - Polymer Characterization by LC / MALDI-MS Coupling
T2 - Vortragstagung "Funktionspolymere für Systemlösungen"
CY - Darmstadt, Germany
DA - 2002-03-18
PY - 2002
AN - OPUS4-1805
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Meyer, Andreas
A1 - Weidner, Steffen
A1 - Kricheldorf, Hans R.
T1 - Star-shaped poly(l-lactide)s based on pentaerythritol: About crystallization and polycondensation plus disproportionation and ring formation in the solid state
N2 - Star-shaped poly( L-lactide)s (s-PLAs), were prepared by ring-opening polymerization of with pentaerythritol and catalyzed by tin(II) 2-ethylhyexanoate (SnOct out in bulk at either 120 ◦ C or 160 ◦ L-lactide (LA) initiated 2 ). Two small series of ROPs were carried C with variation of the LA/initiator ratio. Matrix-assisted laser desorption/ ionization time-of-flight (MALDI-TOF) mass spectra revealed traces of cycles in 120 ◦ C samples only at low initiator/catalyst ratios. In contrast, higher fractions of cycles were detected in samples prepared at 160 C, suggesting a "back-biting" origin. The influence of arm length and thermal history on crystallinity was investigated by differential scanning calorimetry (DSC) and wide-angle x-ray scattering (WAXS). It was shown that annealing increased the melting temperature (T ◦ ◦ m ) and crystallinity. However, annealing at 140 ◦ C for 14 d also caused significant solid-state transesterification. In addition, crystallites composed of s-PLAs with extended arms and, simultaneously, crystallites composed exclusively of extended rings were formed, identified by their typical "sawtooth" pattern in the MALDI mass spectra. Small angle x-ray scattering (SAXS) indicated that the crystal thickness was lower than that of linear PLAs annealed under identical conditions, but increased upon annealing at 140 C.
KW - MALDI-TOF MS
KW - Polylactide
KW - Crystallisation
KW - AStar-shaped polymers
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-636832
DO - https://doi.org/10.1016/j.polymer.2025.128709
SN - 0032-3861
VL - 334
SP - 1
EP - 11
PB - Elsevier Ltd.
AN - OPUS4-63683
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Sample spot heterogeneity investigated by MALDI-imaging mass spectrometry
T2 - 18th International Mass Spectrometry Conference
CY - Bremen, Germany
DA - 2009-08-30
PY - 2009
AN - OPUS4-19375
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Rösler, Alexander
A1 - Weidner, Steffen
A1 - Klamroth, Tillmann
A1 - Müller, Axel HE
A1 - Schlaad, Helmut
T1 - Kinetics of anionic polymerization of β‐myrcene in hydrocarbon solvents
N2 - AbstractThe kinetics of anionic polymerization of β‐myrcene initiated by sec‐butyllithium were examined in saturated and unsaturated hydrocarbon solvents, i.e. cyclohexane, cyclohexene, 4‐vinylcyclohexene and dl‐limonene. Polymerizations usually proceeded in a living manner, i.e. in the absence of termination and chain transfer reactions, in all solvents, to produce well‐defined polymyrcenes with high content (85%) of cis‐1,4 units. However, polymyrcenyllithium chains exhibited limited long‐term stability in 4‐vinylcyclohexene solution, most probably due to chain transfer to solvent. Reaction orders with respect to the concentration of active chains were found to be one‐quarter in cyclohexane increasing to one‐half in unsaturated solvents, indicating that the polymyrcenyllithium chains are present as tetrameric or dimeric associates, respectively. Apparent activation energies were found to be 81 kJ mol−1 in cyclohexane and 77 kJ mol−1 in dl‐limonene solution, which are close to the values obtained by quantum chemical calculations. © 2025 The Author(s). Polymer International published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
KW - Myrcene
KW - Anionic polymerization
KW - Reaction order
KW - Activation energy
KW - Microstructure
KW - Quantum chemical calculation
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-636840
DO - https://doi.org/10.1002/pi.6772
SN - 0959-8103
SP - 1
EP - 8
PB - Wiley
AN - OPUS4-63684
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - SFC of new liquid-crystalline cholesteryl esters
T2 - InCom '96, International Symposium on Instrumentalized Analytical Chemistry and Computer Technology
CY - Düsseldorf, Germany
DA - 1996-03-25
PY - 1996
AN - OPUS4-11194
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Krüger, Ralph-Peter
A1 - Falkenhagen, Jana
A1 - Much, Helmut
A1 - Schulz, Günter
A1 - Weidner, Steffen
T1 - Charakterisierung von synthetischen Polymeren durch Kopplung flüssigchromato-graphischer Trennmethoden mit der MALDI-TOF-Massenspektrometrie
T2 - 1. Berliner Werkstofftag
CY - Berlin, Deutschland
DA - 1999-09-16
PY - 1999
AN - OPUS4-2242
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Liquid Adsorption Chromatography near Critical Conditions of Adsorption coupled with Matrix-assisted Laser Desorption / ionization Mass Spectrometry
T2 - 47th Conference of The American Society of Mass Spectrometry
CY - Dallas, TX, USA
DA - 1999-06-11
PY - 1999
AN - OPUS4-2240
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
A1 - Just, Ulrich
A1 - Werthmann, Barbara
A1 - Decker, Renate
A1 - Schwarz, Bärbel
A1 - Borowski, Renate
T1 - MALDI/MS - A New Technique in Characterizing Chemical Heterogeneity of Degradation Products of Poly(Ethylene Terephthalate)s
T2 - International GPC Symposium '96
CY - San Diego, CA, USA
DA - 1996-09-08
PY - 1996
SP - 632
EP - 651
CY - Milford, Mass.
AN - OPUS4-11905
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - LC-MALDI coupling for the analysis of polymers
T2 - National Meeting of the Centre National de la Recherche Scientifique (CNRS)
CY - Strasbourg, France
DA - 2004-06-03
PY - 2004
AN - OPUS4-11308
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Falkenhagen, Jana
A1 - Weidner, Steffen
ED - Barner-Kowollik, C.
ED - Gründling, T.
ED - Falkenhagen, Jana
ED - Weidner, S.
T1 - Hyphenated techniques
KW - MALDI
KW - Chromatography
KW - Coupling techniques
PY - 2012
SN - 978-3-527-32924-3
SP - 209
EP - 235
PB - Wiley-VCH Verlag GmbH & Co. KGaA
AN - OPUS4-26395
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Multivariate statistics applied to MALDI-TOF MS data of pollen samples
N2 - Pollen represent one major cause for human allergic diseases. Currently the characterization and identification of pollen is time-consuming since it mainly relies on the microscopic determination of the genus-specific pollen morphology. A variety of new analytical approaches, like Raman - and fluorescence spectroscopy have been proposed in order to develop fast and reliable pollen identification. Recently matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) was initially applied for the rapid investigation of such complex biological samples. Taxonomic differences and relations of single pollen grains could be identified.
Both commercially available lyophilized pollen and fresh pollen acquired from biological samples collected in parks and in the Botanical Garden Berlin in the years 2013-2015 were investigated. The samples were prepared by formic acid extraction in the gas phase and spotted with HCCA matrix. A variety of new approaches, like a newly developed MALDI target with micrometer sample spots sizes, were tested for their suitability. The obtained mass spectral data were investigated by principal component analysis (PCA).
The applicability of MALDI-TOF mass spectrometry for the classification of pollen according to their taxonomic relationships was proven. Specifically, chemical differences in the mass spectra at the levels of plant order, genus and in many cases even of species could be identified. Based on these results, further investigations have been undertaken to optimize the sample preparation for the classification of single pollen grains in mixtures of pollens. A novel MALDI-target design was developed to enhance the phenotypic information of pollens in their mass spectra. The combination of mass spectral patterns and multivariate statistics provide a powerful tool for the investigation of structural correlations within mixtures. The results can be used to improve the reconstruction of taxonomic relations of single species in various mixtures and might be useful for the development of a fast routine method to identify pollen based on mass spectrometry.
T2 - 64th ASMS Conference on Mass Spectrometry and Allied Topics
CY - San Antonio, TX, USA
DA - 05.06.2016
KW - Pollen
KW - MALDI-TOF Mass Spectrometry
KW - Multivariate statistics
PY - 2016
AN - OPUS4-36837
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Friedrich, Jörg Florian
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
A1 - Giebler, Rainer
A1 - Koprinarov, Ivaylo
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
ED - Mittal, K. L.
T1 - Significance of interfacial redox reactions and formation of metal-organic complexes for the adhesion of metals on pristine and plasma-treated polymers
KW - Oxygen low-pressure plasma treatment of polymers
KW - Metal-polymer interactions
KW - Peel strength
PY - 2000
SN - 90-6764-327-0
VL - 2
SP - 137
EP - 171
PB - VSP
CY - Utrecht
AN - OPUS4-6979
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Schulz, Eckhard
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
T1 - Improvement in Mechanical Strength of Fibre Polymer Composites by Fibre Pretreatment in Low-Pressure Plasmas
T2 - Vortragsbände des 8. Internationalen Techtextil-Symposiums 1997
CY - Frankfurt am Main, Deutschland
DA - 1997-05-12
PY - 1997
SP - 1(?)
EP - 16(?)
PB - Messe Frankfurt
CY - Frankfurt am Main
AN - OPUS4-7286
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Wigant, L.
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
A1 - Geng, Sh.
A1 - Erdmann, J.
A1 - Gorsler, H.-V.
T1 - Plasmavorbehandlungen von Polymeroberflächen
T2 - 2. Freiberger Polymertag
CY - Freiberg
DA - 1995-05-30
PY - 1995
SP - 17 Seiten
CY - Freiberg
AN - OPUS4-7014
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kricheldorf, H. R.
A1 - Weidner, Steffen
A1 - Meyer, A.
T1 - Poly(L-lactide): Optimization of Melting Temperature and Melting Enthalpy
N2 - Twice recrystallized L-lactide was polymerized with a dozen of different tin or bismuth catalysts in bulk at 160°C for 24 h and was annealed at 150°C afterwards. In two cases Tm values above 197.0°C were obtained. The parameters causing a scattering of the DSC data were studied and discussed. The samples prepared with SnCl2, 2,2-dibutyl-2-stanna-1,3-ditholane (DSTL) or cyclic tin(II) bisphenyldioxide (SnBiph) were subject to annealing programs with variation of time and temperatures, revealing that the Tm´s did not increase. However, an increase of Hm was achieved with maximum values in the range of 93-96 J g-1 corresponding to crystallinities off around 90%. Further studies were performed with once recrystallized L-lactide. Again, those samples directly crystallized from the polymerization process showed the highest Tm values. These data were compared with the equilibrium Tm0 and Hm0 data calculated by several research groups for perfect crystallites. A Tm0 of 213+/-2°C and a Hm0 of 106 J g-1 show the best agreement with the experimental data. The consequences of annealing for the thickness growth of crystallites are discussed on the basis of SAXS measurements. Finally, a comparison of cyclic and linear poly L-lactide)s is discussed.
KW - Polylactide
KW - MALDI-TOF MS
KW - Transesterification
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-538656
DO - https://doi.org/10.1039/D1MA00957E
SP - 1
EP - 10
PB - Royal Society for Chemistry
AN - OPUS4-53865
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kricheldorf, H. R.
A1 - Weidner, Steffen
T1 - ROP of L-lactide and ε-caprolactone catalyzed by tin(ii) andtin(iv) acetates–switching from COOH terminated linear chains to cycles
N2 - The catalytic potential of tin(II)acetate, tin(IV)acetate, dibutyltin-bis-acetate and dioctyl tin-bis-acetate was compared based on polymerizations of L-lactide conducted in bulk at 160 or 130°C. With SnAc2 low-Lac/Cat ratios (15/1–50/1) were studied and linear chains having one acetate and one carboxyl end group almost free of cyclics were obtained. Higher monomer/catalyst ratios and lower temperatures favored formation of cycles that reached weight average molecular weights (Mw's) between 100,000 and 2,500,000. SnAc4 yielded mixtures of cycles and linear species under all reaction conditions. Dibutyltin- and dioctyl tin bis-acetate yielded cyclic polylactides under most reaction conditions with Mw's in the range of 20,000–80,000. Ring-opening polymerizations performed with ε-caprolactone showed similar trends, but the formation of COOH-terminated linear chains was significantly more favored compared to analogous experiments with lactide. The reactivity of the acetate catalysts decreased in the following order: SnAc2> SnAc4>Bu2SnAc2~Oct2SnAc2
KW - Polylactide
KW - MALDI-TOF MS
KW - Catalyst
KW - Ring-opening polymerization
KW - Tin acetates
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-521923
DO - https://doi.org/10.1002/pol.20200866
VL - 59
IS - 5
SP - 439
EP - 450
PB - Wiley Online Library
AN - OPUS4-52192
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Entmischungsphänomene in der MALDI dried-droplet Probenpräparation und deren Vermeidung
T2 - Anakon 2015
CY - Graz (Österreich)
DA - 2015-03-23
PY - 2015
AN - OPUS4-33053
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Mahoney, C.M.
A1 - Weidner, Steffen
ED - Barner-Kowollik, C.
ED - Gründling, T.
ED - Falkenhagen, Jana
ED - Weidner, S.
T1 - Surface analysis and imaging techniques
KW - Surface analysis
KW - Imaging techniques
PY - 2012
SN - 978-3-527-32924-3
SP - 149
EP - 207
PB - Wiley-VCH Verlag GmbH & Co. KGaA
AN - OPUS4-26396
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CHAP
A1 - Weidner, Steffen
ED - Matyjaszewski, K.
ED - Möller, M.
T1 - Mass spectrometry: MALDI (Matrix-Assisted Laser Desorption/Ionization) and ESI (Electrospray Ionization)
N2 - In recent years mass spectrometric methods, in particular matrix-assisted laser desorption/ionization (MALDI) and electrospray ionization (ESI) time-of-flight (TOF) mass spectrometry (MS) have become indispensable tools for analyzing molecular masses and mass distributions of polymers. Moreover, these techniques offer the advantage of being able to determine simultaneously chemical functionality, and compositional and topological distributions of polymers. Especially in combination with liquid and/or gas phase separation methods, a comprehensive polymer characterization can be achieved and the difficulties of MS to analyze chemically heterogeneous polymers, copolymers, and samples with broad molecular mass distribution can be overcome.
KW - MALDI
KW - ESI
KW - Polymere
KW - Electrospray ionization
KW - Mass spectrometry
KW - Matrix-assisted laser desorption/ionization
KW - Tandem MS
KW - Time of flight
PY - 2012
SN - 978-0-444-53349-4
DO - https://doi.org/10.1016/B978-0-444-53349-4.00023-6
VL - 2
IS - Chapter 2.05
SP - 93
EP - 109
PB - Elsevier
CY - Amsterdam
AN - OPUS4-26098
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - You, Zengchao
A1 - Meier, Florian
A1 - Weidner, Steffen
ED - Weidner, Steffen
T1 - Comparison of miniaturized and conventional asymmetrical flow field flow fractionation (AF4) channels for nanoparticle separation
N2 - The performance of a miniaturized channel for the separation of polymer and metal nanoparticles (NP) using Asymmetrical Flow Field-Flow Fractionation (AF4) was investigated and compared with a conventional AF4 system. To develop standard separation methods, experimental parameters like cross flow, gradient profile and injection time were varied and optimized.
Corresponding chromatographic parameters were calculated and compared. Our results indicate that the chromatographic resolution in the miniaturized channel is lower, whereas significantly shorter analyses time and less solvent consumption were obtained. Moreover, the limit of detection (LOD) and limit of quantification (LOQ) obtained from hyphenation with a UV-detector are obviously lower than in a conventional channel, which makes the miniaturized channel interesting for trace analysis.
KW - Nanoparticles separation asymetrical flow field flow fractionation
PY - 2017
DO - https://doi.org/10.3390/separations4010008
SN - 2297-8739
VL - 4
IS - 1
SP - 8, 1
EP - 11
AN - OPUS4-47196
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CHAP
A1 - Weidner, Steffen
A1 - Falkenhagen, Jana
ED - Li, L.
T1 - LC-MALDI MS for polymer characterization
KW - Mass spectrometry
KW - Polymers
PY - 2010
SN - 978-0-471-77579-9
N1 - Serientitel: Chemical analysis: a series of monographs on analytical chemistry and its applications – Series title: Chemical analysis: a series of monographs on analytical chemistry and its applications
VL - 175
IS - Chapter 11
SP - 247
EP - 265
PB - John Wiley & Sons
AN - OPUS4-26406
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Cyclic polylactides via ring-expansion polymerization
N2 - We will report on a new kind of ring-expansion polymerization (REP) of cyclic esters based of three classes of catalysts.
In contrast to REP described previously these new polymerizations are characterized by a self-extrusion of the catalysts resulting in cyclic homopolyesters as the only reaction product. These REP of L-lactide were performed in bulk at temperatures between 100 and 180°C without racemization. A simplified scheme of a REP catalyzed by BuCa or SnBi is presented below. With meso-lactide temperatures down to 60°C were realized. Depending on catalyst, time and temperature with equal quantities of even and odd-numbered cycles a strong predominance of either even or odd-numbered cycles was found.
T2 - 255th ACS National Meeting
CY - New Orleans, LA, USA
DA - 18.03.2018
KW - MALDI-TOF MS
KW - Poly(lactide)
KW - Polymerisation
KW - Catalysts
PY - 2018
AN - OPUS4-44833
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF-MS for the determination of polymerization mechanisms of biodegradable polymers
N2 - Eine neue Art einer Ring-Expansion Polymerization (REP) von zyklischen Polylaktiden mittels neuer Katalysatoren wird präsentiert.
MALDI-TOF Massenspektrometrie und andere analytische Techniken wurden zur Aufklärung des Mechanismus eingesetzt. Dabei zeigte sich, dass im Gegensatz zu anderen REP, ausschließlich zyklische Polymere gebildet wurden. Diese stellen neue Kandidatenmaterialien für zukünftige neue CRM dar.
T2 - 22. MALDI-Kolloquium
CY - Berlin, Germany
DA - 15.05.2018
KW - MALDI-TOF MS
KW - Polylaktid
KW - Zyklen
PY - 2018
AN - OPUS4-44835
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Improved analysis of ultra-high mass polymers in MALDI-TOF mass spectrometry
T2 - ASMS 2015
CY - St. Louis (USA)
DA - 2015-05-30
PY - 2015
AN - OPUS4-33446
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
A1 - Koprinarov, Ivaylo
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
ED - Schindel-Bidinelli, E.
T1 - Umweltfreundliches Metallisieren von Kunststoffen durch Plasmavorbehandlung in einem geschlossenen Reaktor
T2 - Swissbonding 97 ; 11. Internationales Symposium Klebtechnik und Umwelt ; 11th International Symposium Bonding and Sealing Technology
CY - Rapperswil, Schweiz
DA - 1997-05-26
PY - 1997
SP - 1(?)
EP - 3(?)
PB - SWIBOTECH
CY - Rorbas
AN - OPUS4-6994
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Rösler, Alexander
A1 - Weidner, Steffen
A1 - Klamroth, Tillmann
A1 - Müller, Axel HE
A1 - Schlaad, Helmut
T1 - Kinetics of anionic polymerization of β‐myrcene in hydrocarbon solvents
N2 - AbstractThe kinetics of anionic polymerization of β‐myrcene initiated by sec‐butyllithium were examined in saturated and unsaturated hydrocarbon solvents, i.e. cyclohexane, cyclohexene, 4‐vinylcyclohexene and dl‐limonene. Polymerizations usually proceeded in a living manner, i.e. in the absence of termination and chain transfer reactions, in all solvents, to produce well‐defined polymyrcenes with high content (85%) of cis‐1,4 units. However, polymyrcenyllithium chains exhibited limited long‐term stability in 4‐vinylcyclohexene solution, most probably due to chain transfer to solvent. Reaction orders with respect to the concentration of active chains were found to be one‐quarter in cyclohexane increasing to one‐half in unsaturated solvents, indicating that the polymyrcenyllithium chains are present as tetrameric or dimeric associates, respectively. Apparent activation energies were found to be 81 kJ mol−1 in cyclohexane and 77 kJ mol−1 in dl‐limonene solution, which are close to the values obtained by quantum chemical calculations. © 2025 The Author(s). Polymer International published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
KW - Myrcene
KW - Anionic polymerization
KW - MALDI TOF MS
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-649039
DO - https://doi.org/10.1002/pi.6772
SN - 0959-8103
SP - 1
EP - 8
PB - Wiley
AN - OPUS4-64903
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Weidner, Steffen
A1 - Kricheldorf, Hans R.
T1 - Transesterification in the solid state of cyclic and linear poly(l-lactide)s
N2 - Poly(l-lactide)s are synthesized and annealed at 120 °C and changes of the molecular weight distribution (MWD) are monitored by matrix-assited laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry. For example, benzyl alcohol+SnOct2 causes equilibration of odd- and even-numbered chains and the final goal of the transesterification is the most probable distribution. The underlying intermolecular transesterification is even observed at 100 and 80 °C in the solid state. However, cyclic tin mercaptide catalysts transform the initial most probable distribution into a MWD with maxima, which display a conspicuous fine structure due to a preferential crystallization of certain ring sizes. The optimum ring sizes for the crystallization are provided by ring-ring equilibration. The gradual formation of a special morphology shifts the melting temperature to values up to 187 °C. Annealing of commercial poly(l-lactide) with a cyclic tin catalyst also yields a distribution of mass peaks with a maximum showing the characteristic fine structure.
KW - Equilibration
KW - Mass spectrometry
KW - Polylactides
KW - Ring-opening polymerization
KW - Transesterification
PY - 2017
DO - https://doi.org/10.1002/macp.201700114
SN - 1521-3935
SN - 1022-1352
VL - 218
IS - 14
SP - 1700114-1
EP - 1700114-10
PB - Wiley-VCH
AN - OPUS4-41732
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Weidner, Steffen
A1 - Falkenhagen, Jana
A1 - Much, Helmut
A1 - Krüger, Ralph-Peter
A1 - Friedrich, Jörg Florian
T1 - Determination of chemical and molecular-weight distributions of heterogeneous polymers by means of MALDI-MS coupled with chromatography
T2 - 219th ACS national meeting
CY - San Francisco, CA, USA
DA - 2000-03-26
PY - 2000
SN - 0032-3934
VL - 41
IS - 1
SP - 655
EP - 656
PB - American Chemical Society
CY - Newark, NJ
AN - OPUS4-2169
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Friedrich, Jörg Florian
A1 - Unger, Wolfgang
A1 - Lippitz, Andreas
A1 - Koprinarov, Ivaylo
A1 - Weidner, Steffen
A1 - Kühn, Gerhard
ED - Nowack, H.
T1 - Wechselwirkungen zwischen plasmamodifizierten Polymeroberflächen und Metallen
T2 - 5. Internationale Fachtagung - ND-Plasma-Technologie
CY - Duisburg, Deutschland
DA - 1997-09-22
PY - 1997
VL - 5
SP - 1(?)
EP - 17(?)
PB - Print-Service
CY - Mülheim
AN - OPUS4-6995
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Hyphenated coupling methods for polymer characterization and identification
T2 - Dutch Polymer Workshop
CY - Jena, Germany
DA - 2013-12-09
PY - 2013
AN - OPUS4-30268
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Abbau und Zersetzungsverhalten von Polymeren und Komposit‐ Materialien auf Polyurethanbasis
N2 - Polyurethane zeichnen sich durch ihre große Flexibilität des Anwendungsbereiches aus. Im Rahmen dieses Vortrags wird ein neues Themenfeldprojekt der BAM vorgestellt und erste Ergebnisse präsentiert.
T2 - Deutsche Gesellschaft für Materialprüfung, Fachausschuss Polymerwerkstoffe
CY - Darmstadt, Germany
DA - 10.11.2016
KW - Polyurethane
KW - Abbauverhalten
PY - 2016
AN - OPUS4-38332
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - ^Mass spectrometry of synthetic polymers applications and limitations of the MALDI-TOF technique
T2 - APST 2 (Advances in Polymer Science and Technology)
CY - Linz, Austria
DA - 2011-09-28
PY - 2011
AN - OPUS4-25271
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Sample spot heterogeneity investigated by MALDI-imaging mass spectrometry
T2 - 57th ASMS Conference On Mass Spectrometry and Allied Topics
CY - Philadelphia, PA, USA
DA - 2009-05-31
PY - 2009
AN - OPUS4-19191
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF Imaging Mass Spectrometry - an universal detector for copolymer chromatography
T2 - ASMS-Conference on Mass Spectrometry
CY - Denver, CO, USA
DA - 2011-06-04
PY - 2011
AN - OPUS4-23732
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI TOF MS zur Aufklärung von Kristallisationsprozessen in Polyestern
N2 - MALDI TOF Massenspektrometrie wurde verwendet, um Kristallisationsprozesse in Polyestern (Polylactide, Polyglycolide) zu untersuchen. Dabei konnte gezeigt werden, dass Zyklen und Linearen simultan, aber in unterschiedlichen Kristalliten, kristallisieren. Die dabei ablaufenden Umesterungen (Transesterifizierungen) konnten mit der MALDI TOF Massenspektrometrie nachgewiesen werden. Damit wurde ein völlig neues Anwendungsgebiet dieser MS Methode demonstriert.
T2 - 28. Kolloquium Massenspektrometrie von Polymeren
CY - Berlin, Germany
DA - 14.05.2024
KW - MALDI TOF MS
KW - Bioabbaubare Polymere
KW - Crystallinity
PY - 2024
AN - OPUS4-60029
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Wachtendorf, Volker
A1 - Geburtig, Anja
A1 - Elert, Anna Maria
A1 - Weidner, Steffen
T1 - Einfluss von Feuchte und Nässe auf die Witterungs-induzierte Alterung am Beispiel eines Polyurethans
N2 - In diesem Beitrag soll der relative Einfluss des Wassers als Feuchte und Nässe unter den Beanspruchungsfaktoren untersucht werden. Die Unterscheidung von Luftfeuchte und Nässe bezüglich ihrer Wirkung ist dabei notwendig, weil die stehende Nässe zusätzliche Extraktionswirkung besitzt und auch die verfügbare Sauerstoffmenge beeinflusst.
Dazu wurde ein Polymer, das im Rahmen des BAM-internen Projektes PolyComp untersucht wird, künstlich bewittert. Hierzu wurde ein Fluoreszenzlampengerät mit UV-A 340 nm Leuchtstoffröhren verwendet, in dessen Probenraum durch zusätzliche Kammern die gleichzeitige Bewitterung unter drei unterschiedlichen Feuchte-Varianten realisiert wurde (bei konstanter Temperatur):
- UV und trocken
- UV und hohe Luftfeuchte
- UV und stehende Nässe
Das gleichzeitige Einwirken der einzelnen Einflussfaktoren kann dabei konkurrierende oder aufeinander folgende chemische Reaktionen und physikalische Prozesse und somit ein anderes Ergebnis bewirken, als wenn sie isoliert nacheinander auf eine Probe eingewirkt hätten.
Über die erwähnten Varianten hinaus kann auch noch der spezifische Einfluss der UV-Strahlung mit untersucht werden, weil die Proben im Bereich ihrer Befestigung verdeckt sind.
Die Methodik und erste Ergebnisse dieser Untersuchung werden präsentiert.
T2 - 46. Jahrestagung der Gesellschaft für Umweltsimulation (GUS) 2017
CY - Stutensee-Blankenloch bei Karlsruhe, Germany
DA - 22.03.2017
KW - Polyurethan
KW - TPU
KW - Bewitterung
KW - UV
KW - Feuchte
KW - Nässe
PY - 2017
SN - 978-3-9816286-9-2
VL - 46
SP - 251
EP - 261
PB - Gesellschaft für Umweltsimulation e. V
CY - Pfinztal (Berghausen)
AN - OPUS4-39906
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - MALDI-TOF MS von ultra-hochmolekularen Polystyrolen mittels DCTB und Cäsium-Salzen
T2 - 19. Kolloquium MALDI und Synthetische Polymere
CY - Berlin
DA - 2015-05-12
PY - 2015
AN - OPUS4-33055
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Weidner, Steffen
T1 - Untersuchung von plasmamodifizierten Polymeren mit speziellen Analysenmethoden
T2 - Abteilungsseminar, BAM, Abt. VI
CY - Berlin, Germany
DA - 1996-05-02
PY - 1996
AN - OPUS4-6411
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bui, Minh
A1 - Heinekamp, Christian
A1 - Fuhry, Emil
A1 - Weidner, Steffen
A1 - Radnik, Jörg
A1 - Ahrens, Mike
A1 - Scheurell, Kerstin
A1 - Balasubramanian, Kannan
A1 - Emmerling, Franziska
A1 - Braun, Thomas
T1 - Lewis-acid induced mechanochemical degradation of polyvinylidene fluoride: transformation into valuable products
N2 - Polyvinylidene fluoride (–[CH2CF2]n–, PVDF) waste poses significant environmental challenges due to its recalcitrant nature and widespread use. This study addresses the end-of-life management of PVDF by introducing a novel, sustainable mechanochemical approach for its valorisation. We investigated the degradation of PVDF into value-added materials using ball milling with anhydrous AlCl3 to achieve a quantitative mineralisation producing AlF3 and halide-functionalised graphite, along with gaseous products (HCl and CH4). Mechanistic key steps involve Lewis-acid catalysed C–F bond activation, dehydrofluorination and aromatisation. This approach provides an effective solution for PVDF waste management while offering a promising route for the production of high-value materials from polymer waste streams. Our findings contribute to sustainable practices in polymer recycling and resource recovery, respond to pressing environmental concerns associated with fluoropolymer disposal, and demonstrate the potential to convert polymer wastes into useful products.
KW - Mechanochemistry
KW - Polyvinylidenfluoride
KW - Degradation
KW - Ball mill
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-649015
DO - https://doi.org/10.1039/d5sc05783c
SN - 2041-6520
VL - 16
IS - 40
SP - 18903
EP - 18910
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-64901
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -