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 -
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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 -