Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-2165 Beitrag zu einem Tagungsband Weidner, Steffen; Falkenhagen, Jana; Friedrich, Jörg Florian; Krüger, Ralph-Peter; Schulz, Günter; Much, Helmut Liquid Adsorption Chromatography near Critical Conditions of Adsorption coupled with Matrix-assisted Laser/Ionization Mass Spectrometry Dallas, Tex American Society for Mass Spectrometry 1999 Proceedings of the 47th ASMS Conference on Mass Spectrometry and Allied Topics 47th ASMS Conference on Mass Spectrometry and Allied Topics Dallas, TX, USA 1999-06-13 1999-06-17 2016-02-19 OPUS4-2168 Zeitschriftenartikel Falkenhagen, Jana; Friedrich, Jörg Florian; Schulz, Günter; Krüger, Ralph-Peter; Much, Helmut; Weidner, Steffen Liquid Adsorption Chromatography near Critical Conditions of Adsorption coupled with Matrix-assisted Laser Desorption/Ionization Mass Spectrometry Chemical heterogeneities and molecular weight distributions of poly(ethylene oxide) (PEO)-co-polymethylene (PM) model oligomers, which are relevant to the synthesis of commonly used tensides, were investigated. For analytical characterization, the well-known principle of liquid adsorption chromatography at 'critical conditions' (LACCC) was modified. Near the critical conditions of adsorption of the PEO unit, e.g., at slight adsorption conditions of PM, the copolymers could be separated according to their PM chain length. The eluates were separated and single fractions of each peak were continuously transferred onto the MALDI target by means of a commercially available device. Simultaneously, the MALDI matrix solution was continuously added with a second pump. This procedure offers the possibility of the formation of homogeneous matrix-polymer textures. By MALDI-MS a complete characterization of the chemical composition (PEO and PM chain length) of each peak could be achieved. The obtained MALDI mass spectra of the eluates at different retention times could be used for the molecular weight calibration of the LAC system. In this way, an additional application of SEC, as in conventional 2D-chromatography, was avoided by using the MALDI method as quasi chromatographic separation Amsterdam Gordon and Breach Publ. 2000 International journal of polymer analysis and characterization 5 549 562 10.1080/10236660008034644 2016-02-19 OPUS4-2169 Zeitschriftenartikel Weidner, Steffen; Falkenhagen, Jana; Much, Helmut; Krüger, Ralph-Peter; Friedrich, Jörg Florian Determination of chemical and molecular-weight distributions of heterogeneous polymers by means of MALDI-MS coupled with chromatography Newark, NJ American Chemical Society 2000 Polymer preprints 41 219th ACS national meeting San Francisco, CA, USA 2000-03-26 2000-03-30 1 655 656 2016-02-19 OPUS4-2240 Posterpräsentation Weidner, Steffen Liquid Adsorption Chromatography near Critical Conditions of Adsorption coupled with Matrix-assisted Laser Desorption / ionization Mass Spectrometry 1999 47th Conference of The American Society of Mass Spectrometry 47th Conference of The American Society of Mass Spectrometry Dallas, TX, USA 1999-06-11 1999-06-16 2016-02-19 OPUS4-1805 Beitrag zu einem Tagungsband Falkenhagen, Jana; Krüger, Ralph-Peter; Schulz, Günter; Weidner, Steffen Polymer Characterization by LC / MALDI-MS Coupling Gesellschaft Deutscher Chemiker 2002 Vortragstagung "Funktionspolymere für Systemlösungen" Vortragstagung "Funktionspolymere für Systemlösungen" Darmstadt, Germany 2002-03-18 2002-03-19 2016-02-19 OPUS4-2256 Beitrag zu einem Tagungsband Falkenhagen, Jana; Krüger, Ralph-Peter; Schulz, Günter; Weidner, Steffen Polymer characterization by LC / MALDI-MS coupling Bayreuth 2001 Bayreuther Polymer Symposium Bayreuther Polymer Symposium 2001 Bayreuth, Germany 2001-09-16 2001-09-18 2016-02-19 OPUS4-2242 Beitrag zu einem Tagungsband Krüger, Ralph-Peter; Falkenhagen, Jana; Much, Helmut; Schulz, Günter; Weidner, Steffen Charakterisierung von synthetischen Polymeren durch Kopplung flüssigchromato-graphischer Trennmethoden mit der MALDI-TOF-Massenspektrometrie Institut für Nichtmetallische Werkstoffe, TU Berlin 1999 Vorträge des 1. Berliner Werkstofftages 1. Berliner Werkstofftag Berlin, Deutschland 1999-09-16 2016-02-19 OPUS4-2250 Beitrag zu einem Sammelband Falkenhagen, Jana; Krüger, Ralph-Peter; Much, Helmut; Schulz, Günter; Weidner, Steffen Grellmann, W. Characterization and identification of new polymer structures by optimization and coupling of HPLC and MALDI-TOF-MS Halle Martin-Luther-Univ. Universität, Halle, Saale / Fachbereich Ingenieurwissenschaften 2000 Polymerwerkstoffe 2000 3-86010-605-8 Polymerwerkstoffe 2000 Halle (Saale), Germany 2000-09-25 2000-09-27 2016-02-19 OPUS4-3094 Vortrag Weidner, Steffen Zweidimensionale Charakterisierung von PA 6.6 durch Kopplung von LAC und MALDI-MS 2003 7. Kolloquium "MALDI und synthetische Polymere" 7. Kolloquium "MALDI und synthetische Polymere" Berlin, Germany 2003-05-13 2016-02-19 OPUS4-1608 Zeitschriftenartikel Cappella, Brunero; Sturm, Heinz; Weidner, Steffen Breaking polymer chains by dynamic plowing lithography The adhesion of poly(methyl methacrylate) (PMMA) and polystyrene (PS) films, whose surface has been previously structured by dynamic plowing lithography (DPL), has been measured by means of force–displacement curves. The different adhesion of modified and unmodified PS leads to the assumption that polymer chains are broken during DPL. After measuring the energy dissipated by the tip during DPL, in order to check that the transferred energy is sufficient to break covalent bonds, the polymer chain scission caused by the lithographic process has been definitely confirmed by size exclusion chromatography measurements of the lithographed films. Berlin Springer 2002 Polymer 43 16 4461 4466 10.1016/S0032-3861(02)00285-9 2016-02-19 OPUS4-2608 Beitrag zu einem Tagungsband Krüger, Rita; Kelm, Jürgen; Kretzschmar, Hans-Jürgen; Schulze, Dietmar; Trubiroha, Peter; Weidner, Steffen Eine neue Klasse von Ozonschutzmitteln - verbesserter Ozonschutz durch teilweisen Einbau in die Polymermatrix Frankfurt, Main DKG, Dt. Kautschuk-Ges. 2003 Summaries of the International Rubber Conference 2003 IRC '03 ; International Rubber Conference 2003 ; Internationale Kautschuk-Tagung 2003 Nürnberg, Deutschland 2003-06-30 2003-07-03 139 142 2016-02-19 OPUS4-2631 Beitrag zu einem Tagungsband Just, Ulrich; Weidner, Steffen; Wittke, Wolfgang; Friedrich, Jörg Florian; Rittig, F.; Gruber, F. 2D-Characterization of Polyamides using Chromatography and MALDI-TOF-MS 2003 Waters International GPC 2003 and ISPAC-16-Symposium Waters International GPC 2003 and ISPAC-16-Symposium Baltimore, MD, USA 2003-06-09 2003-06-12 2016-02-19 OPUS4-2710 Beitrag zu einem Tagungsband Friedrich, Jörg Florian; Gerstung, Vanessa; Mix, Renate; Kühn, Gerhard; Weidner, Steffen d'Agostino, R. Pulsed plasma initiated homo- and copolymerisation - molar masses Bari Dep. of Chemistry, Univ. International Union of Pure and Applied Chemistry 2003 Proceedings of the 16th International Symposium on Plasma Chemistry 16th International Symposium on Plasma Chemistry (ISPC-16) Taormina, Italy 2003-06-22 2003-06-26 CD-ROM 2016-02-19 OPUS4-11094 Zeitschriftenartikel Weidner, Steffen; Wolff, D.; Springer, J. Phase Behaviour of Copolymers Containing Cholesterol and 4,4' Methoxybiphenyl as Mesogenic Group London Taylor & Francis 1996 Liquid crystals 20 5 587 593 2016-02-19 OPUS4-11095 Zeitschriftenartikel Weidner, Steffen; Holländer, A.; Kühn, Gerhard Matrix-assisted Laser Desorption/Ionization Mass Spectrometry of C36- Alkane degradated by Vacuum Ultraviolet Radiation Chichester Wiley 1997 Rapid communications in mass spectrometry 11 447 450 2016-02-19 OPUS4-11096 Zeitschriftenartikel Weidner, Steffen; Wolff, D.; Springer, J. Influence of Spacer Variation on Phase Behaviour of Liquid-Crystalline Copolymethacrylates containing Cholesterol and S-(-)-4,4'-chloropropionyl-oxybiphenyl London Taylor & Francis 1997 Liquid crystals 22 2 193 201 2016-02-19 OPUS4-11097 Zeitschriftenartikel Weidner, Steffen; Decker, R.; Holländer, A. Derivatization of Double Bonds investigated by Matrix-assisted Laser Desorption/Ionization Mass Spectrometry Chichester Wiley 1997 Rapid communications in mass spectrometry 11 914 918 2016-02-19 OPUS4-11098 Zeitschriftenartikel Gross, J.H.; Weidner, Steffen Influence of Electric Field Strength and Emitter Temperature on Field Desorption Mass Spectra of Polyethylene Oligomers The influence of electric field strength and emitter temperature on dehydrogenation and C–C cleavage in field desorption (FD) mass spectrometry of polyethylene (PE) oligomers of average molecular weights ranging from 500 to 2000 is examined. Low mass oligomers yield molecular weight (MW) distributions that are basically in accordance with results from gel-permeation chromatography. For these materials, dehydrogenation can be greatly reduced by reduction of the emitter potential. Furthermore, the influence of emitter potential on MW distributions indicates the occurrence of field-induced C–C cleavages. Reliable MW distributions are more difficult to obtain from higher mass oligomers by FD-MS because of the need for higher field strength and higher emitter temperatures to effect their desorption/ionization. Experiments reveal that the application of FD-MS to PE oligomers is limited not only by field-induced but also by thermally-induced fragmentations. Even then, FD mass spectra contain valuable information on mass range and homogeneity of PE samples up to about m/z 3600. Chichester IM Publications 2000 European journal of mass spectrometry 6 11 17 10.1255/ejms.300 2016-02-19 OPUS4-11099 Zeitschriftenartikel Czichocki, G.; Fiedler, H.; Haage, K.; Much, Helmut; Weidner, Steffen Characterization of alkyl polyglycosides by both reversed-phase and normal-phase modes of high-performance liquid chromatography Alkyl polyglycosides today represent the most important sugar surfactant. Nonionic sugar surfactants produced via different synthetic routes are mixtures of alkyl homologues, oligomers, anomers and isomers. Alkyl homologues and oligomers of alkyl mono- and diglucosides were separated by reversed-phase high-performance liquid chromatography (HPLC) with methanol–water as the mobile phase using a gradient elution. The gradient was optimized in respect to a simultaneous separation of alkyl glycosides according to their alkyl chain length and alkyl polyoxyethylene glucosides with regard to their length of the polyoxyethylene spacer. The separation of alkyl glycosides into ?- and ?-anomers was carried out by normal-phase HPLC with isooctane–ethyl acetate (60:40, v/v)–2-propanol in the gradient mode. Light scattering detection was used. Matrix-assisted laser desorption ionization time-of-flight mass spectra of alkyl glucosides and dodecyl glucosides with oxyethylene spacer groups are presented. Amsterdam Elsevier 2002 Journal of chromatography A 943 2 241 250 10.1016/S0021-9673(01)01459-5 2016-02-19 OPUS4-11100 Zeitschriftenartikel Gonzalez-Rojano, N.; Arias-Marin, E.; Navarro-Rodriguez, D.; Weidner, Steffen Bidirectional Synthesis of a Series of 2,5- Dodecanoy-phenylene-ethynylene oligomers A family of rigid rod like 2,5-dodecanoxy-phenyleneethynylene oligomers having 3, 5, 7, and 9 repeating units was selectively synthesized by a bi-directional iterative divergent-convergent approach. Starting from a central 1,4-bis(dodecanoxy)-2,5-diiodobenzene monomer, only two repetitive reactions were involved with each cycle of oligomerization: a Pd/Cu cross-coupling with the bifunctional monomer 1-(3,3-diethyltriazene)-2,5-bis(dodecanoxy)-4-(ethynyl)benzene, generating oligomers with terminal triazene groups, followed by a further nucleophilic substitution with iodine. Stuttgart Thieme 2005 Synlett 8 1259 1262 10.1055/s-2005-868474 2016-02-19 OPUS4-11143 Vortrag Weidner, Steffen Charakterisierung der molekularen und chemischen Heterogenität von Polyoxymethylen (POM) 2005 BASF BASF Ludwigshafen am Rhein, Germany 2005-06-17 2016-02-19 OPUS4-11091 Zeitschriftenartikel Weidner, Steffen; Wolff, D.; Springer, J. Influence of Chirality on Phase Behaviour of Copolymers Containing Cholesterol as Mesogenic Group Weinheim Wiley-VCH Verl. 1996 Macromolecular chemistry and physics 197 1337 1348 2016-02-19 OPUS4-11125 Posterpräsentation Weidner, Steffen MALDI/MS - A New Technique in Characterizing Chemical Heterogeneity of Degradation Products of Poly(Ethylene Terephthalate)s 1996 International GPC Symposium '96 International GPC Symposium '96 San Diego, CA, USA 1996-09-08 1996-09-11 2016-02-19 OPUS4-11117 Posterpräsentation Weidner, Steffen Characterization of Technical Waxes using chromatographic techniques and MALDI-MS 1995 10th International Conference on Macromolecules 10th International Conference on Macromolecules Bratislava, Slovakia 1995-09-18 1995-09-22 2016-02-19 OPUS4-11119 Posterpräsentation Weidner, Steffen MALDI-MS - supplementary to chromatographic techniques in characterizing chemical heterogeneity of oligomer ethylene terephthalates 1995 GdCH - Jahrestagung (Arbeitskreis Chromatographie) GdCH - Jahrestagung (Arbeitskreis Chromatographie) Leipzig, Germany 1995-11-06 1995-11-08 2016-02-19 OPUS4-11134 Posterpräsentation Weidner, Steffen Neue Wege zur analytischen Charakterisierung komplexer Polymersysteme 2000 Berliner Polymerentage 2000 Berliner Polymerentage 2000 Berlin, Germany 2000-10-09 2000-10-11 2016-02-19 OPUS4-11136 Vortrag Weidner, Steffen MALDI von geregelten und ungeregelten Polyamiden nach kritischer Chromatographie 2002 VII. Anwendertreffen MALDI-TOF-MS zur Charakterisierung von synthetischen Polymeren VII. Anwendertreffen MALDI-TOF-MS zur Charakterisierung von synthetischen Polymeren Berlin, Germany 2002-05-14 2016-02-19 OPUS4-11138 Vortrag Weidner, Steffen LC-MALDI Coupling for "quantitative" Analysis of Polymers 2002 NIST NIST Gaithersburg, MD, USA 2002-11-06 2002-11-07 2016-02-19 OPUS4-11139 Vortrag Weidner, Steffen Beispiele für zweidimensionale Kopplungen von Chromatographie und MALDI-TOF-Massenspektrometrie zur Analyse von Polymeren 2003 BAM-Abt. VI-Seminar BAM-Abt. VI-Seminar Berlin, Germany 2003-09-25 2016-02-19 OPUS4-11261 Zeitschriftenartikel Just, Ulrich; Werthmann, Barbara; Weidner, Steffen Referenzmaterialien für die Polymeranalytik - Verfahren zur Charakterisierung und Bewertung Gaiberg bei Heidelberg Rubikon 1998 Chemie in Labor und Biotechnik 49 6 223 228 2016-02-19 OPUS4-11312 Posterpräsentation Weidner, Steffen Modifizierung plasmabehandelter Polyolefinoberflächen mit kovalent gebundenen Funktionsmolekülen 1999 Workshop "Medicine meets Material", TEMA Berlin, Institut für Nichtmetallische Werkstoffe der TU Berlin Workshop "Medicine meets Material", TEMA Berlin, Institut für Nichtmetallische Werkstoffe der TU Berlin Berlin, Germany 1999-01-29 2016-02-19 OPUS4-11314 Posterpräsentation Weidner, Steffen Mechanism of homogeneously catalyzed polymerization of liquid-crystalline sidegroup monomers investigated by means of MALDI-TOF-MS (No. 433) 2000 219th ACS National Meeting 219th ACS National Meeting San Francisco, CA, USA 2000-03-26 2000-03-30 2016-02-19 OPUS4-11282 Vortrag Weidner, Steffen UV- und IR-MALDI-TOF-MS zur Bestimmung von Molmasse und chemischer Heterogenität von synthetischen Polymeren 1999 4. Deutsches Bruker Daltonik MALDI-TOF-MS Anwendertreffen 4. Deutsches Bruker Daltonik MALDI-TOF-MS Anwendertreffen Fulda, Germany 1999-04-15 1999-04-16 2016-02-19 OPUS4-11302 Vortrag Weidner, Steffen MALDI-TOF-MS of low-molar mass polyethylene and waxes 2001 49th Conference of the American Society of Mass Spectrometry 49th Conference of the American Society of Mass Spectrometry Chicago, IL, USA 2001-05-25 2001-05-31 2016-02-19 OPUS4-11308 Vortrag Weidner, Steffen LC-MALDI coupling for the analysis of polymers 2004 National Meeting of the Centre National de la Recherche Scientifique (CNRS) National Meeting of the Centre National de la Recherche Scientifique (CNRS) Strasbourg, France 2004-06-03 2016-02-19 OPUS4-11300 Vortrag Weidner, Steffen MALDI-TOF-MS zur Analytik von synthetischen Polymeren 1999 Seminar zur Makromolekularen Chemie im SS 1999, TU Berlin, AK Prof. Springer Seminar zur Makromolekularen Chemie im SS 1999, TU Berlin, AK Prof. Springer Berlin, Germany 1999-11-13 2016-02-19 OPUS4-11301 Vortrag Weidner, Steffen MALDI-MS zur Aufklärung des Mechanismus der homogen katalysierten Polymerisation flüssigkristalliner Seitengruppenmethacrylate 1999 III. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren" III. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren" Berlin, Germany 1999-05-17 2016-02-19 OPUS4-11274 Vortrag Weidner, Steffen Beispiele für die Anwendung von MALDI-MS in der Polymeranalytik und zur Untersuchung von plasmamodifizierten Polymeroberflächen 1995 Hoechst AG, Werk Kalle Albert Hoechst AG, Werk Kalle Albert Wiesbaden, Germany 1995-09-25 2016-02-19 OPUS4-11275 Vortrag Weidner, Steffen Phasenverhalten Cholesterin enthaltender Seitengruppenpolymere 1995 TU Berlin, AK Prof. Springer TU Berlin, AK Prof. Springer Berlin, Germany 1995-11-13 2016-02-19 OPUS4-11276 Vortrag Weidner, Steffen MALDI-MS zur Charakterisierung der Oligomeren nach hydrolytischem und plasmachemischem Abbau von Polymeren 1997 I. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren" I. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren" Berlin, Germany 1997-06-02 2016-02-19 OPUS4-11278 Zeitschriftenartikel Weidner, Steffen; Kühn, Gerhard; Just, Ulrich Characterization of oligomers in poly(ethylene terephthalate) by matrix-assisted laser desorption/ionization mass spectrometry Chichester Wiley 1995 Rapid communications in mass spectrometry 9 697 702 2016-02-19 OPUS4-11280 Vortrag Weidner, Steffen MALDI - Untersuchung zur Oberflächenmodifizierung von Polymeren nach Plasmabehandlung 1997 4. MALDI-Anwendertreffen (Shimadzu) 4. MALDI-Anwendertreffen (Shimadzu) Duisburg, Germany 1997-11-26 2016-02-19 OPUS4-11281 Vortrag Weidner, Steffen Erste Untersuchungen zur Infrarot-MALDI-MS von Polymeren 1998 II. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren" II. BAM-Kolloquium zu "Anwendung von MALDI-MS zur Charakterisierung von synthetischen Polymeren" Berlin, Germany 1998-05-04 2016-02-19 OPUS4-11905 Beitrag zu einem Tagungsband Weidner, Steffen; Kühn, Gerhard; Just, Ulrich; Werthmann, Barbara; Decker, Renate; Schwarz, Bärbel; Borowski, Renate MALDI/MS - A New Technique in Characterizing Chemical Heterogeneity of Degradation Products of Poly(Ethylene Terephthalate)s Milford, Mass. Waters Chromatography Division 1996 International GPC Symposium '96 International GPC Symposium '96 San Diego, CA, USA 1996-09-08 1996-09-11 632 651 2016-02-19 OPUS4-4655 Posterpräsentation Weidner, Steffen Identification of End Group Heterogeneity of Modified Polyamide 6.6 utilizing Two-Dimensional Chromatography/MALDI-MS 2003 51st ASMS Conference 51st ASMS Conference Montreal, Canada 2003-06-08 2003-06-12 2016-02-19 OPUS4-4678 Zeitschriftenartikel Weidner, Steffen MALDI-TOF Mass Spectrometry of Synthetic Polymers (Buchbesprechung) Weinheim Wiley-VCH Verl. Gesellschaft Deutscher Chemiker 2003 Nachrichten aus der Chemie 51 11 1173 2016-02-19 OPUS4-13822 Vortrag Weidner, Steffen Determination of molecular mass and molecular mass distribution of polymers by matrixassisted laser desorption/ionization - time of fightmass spectrometry (MALDI TOF MS) 2006 ISO TC 61/SC 5 Meeting ISO TC 61/SC 5 Meeting Yokohama, Japan 2006-09-18 2006-09-20 2016-02-19 OPUS4-13827 Vortrag Weidner, Steffen MALDI-TOF mass spectrometry for the analysis of synthetic polymers 2006 eingelad. Vortrag im National Institute for Advanced Industrial Science and Technology (AIST) eingelad. Vortrag im National Institute for Advanced Industrial Science and Technology (AIST) Tsukuba, Japan 2006-09-14 2006-09-15 2016-02-19 OPUS4-11194 Posterpräsentation Weidner, Steffen SFC of new liquid-crystalline cholesteryl esters 1996 InCom '96, International Symposium on Instrumentalized Analytical Chemistry and Computer Technology InCom '96, International Symposium on Instrumentalized Analytical Chemistry and Computer Technology Düsseldorf, Germany 1996-03-25 1996-03-29 2016-02-19 OPUS4-7286 Beitrag zu einem Tagungsband Friedrich, Jörg Florian; Schulz, Eckhard; Weidner, Steffen; Kühn, Gerhard Improvement in Mechanical Strength of Fibre Polymer Composites by Fibre Pretreatment in Low-Pressure Plasmas Frankfurt am Main Messe Frankfurt 1997 Techtextil-Symposium '97 Vortragsbände des 8. Internationalen Techtextil-Symposiums 1997 Frankfurt am Main, Deutschland 1997-05-12 1997-05-14 1(?) 16(?) 2016-02-19