TY - CONF A1 - Falkenhagen, Jana T1 - Hyphenated liquid-chromatographic, spectroscopic and spectrometric techniques for polymer characterization T2 - Fraunhofer & PTS-Seminar CY - Potsdam, Germany DA - 2006-03-22 PY - 2006 AN - OPUS4-12378 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - LC / MALDI- und LC / ESI-TOF-MS Kopplung zur Charakterisierung von Polyethern und Polyestern T2 - 11. MALDI-TOF-MS Kolloquium, BAM CY - Berlin, Germany DA - 2007-05-15 PY - 2007 AN - OPUS4-14705 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Charakterisierung von Polyvinylpyrrolidon Homo- und Copolymeren T2 - 9. Kolloquium "MALDI-TOF-MS und synthetische Polymere", BAM CY - Berlin, Germany DA - 2005-05-10 PY - 2005 AN - OPUS4-11557 LA - deu 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 T1 - Characterization of silicon polymers (silsesquioxanes, dendrimers and copolymers) by means of different modes of Liquid Chromatography and MALDI-TOF-MS T2 - 11th International Symposium on Polymer Analysis and Characterization CY - Santa Margherita Ligure, Italien DA - 1998-05-25 PY - 1999 N1 - Serientitel: International journal of polymer analysis and characterization – Series title: International journal of polymer analysis and characterization IS - 5.1999,3 PB - Gordon and Breach CY - St. Helier AN - OPUS4-19053 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Online UP-LACCC / ESI-TOF-MS for characterization of synthetic polymers as complementary tool to LC / MALDI-TOF-MS coupling T2 - 32nd International Symposium on HPLC and Related Techniques CY - Baltimore, MD, USA DA - 2008-05-10 PY - 2008 AN - OPUS4-17897 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - LC - MALDI/ESI-TOF-MS for Charactarization of Complex Polymer Systems T2 - 4th International Symposium on Separation and Characterization of Natural and Synthetic Macromolecules CY - Amsterdam, Netherlands DA - 2009-01-27 PY - 2009 AN - OPUS4-19188 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Structure and end group analysis of complex polymers by LC/MALDI/ESI-TOF CID MS/MS T2 - 11th Bayreuther Polymer Symposium CY - Bayreuth, Germany DA - 2009-09-13 PY - 2009 AN - OPUS4-19988 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Synthesis and characterization of Polylactides by coupling of liquid chromatographic methods with MALDI-TOF-MS T2 - Kick-Off-Meeting; Bioabbaubare Verpackungen aus Polylactid CY - Darmstadt, Germany DA - 2008-05-08 PY - 2008 AN - OPUS4-17895 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Rapid determination of critical conditions of adsorption of synthetic coplymers by UPLC/ESI-MS T2 - Analytica Conference 2008 CY - Munich, Germany DA - 2008-04-01 PY - 2008 AN - OPUS4-17850 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dietrich, M. A1 - Glassner, M. A1 - Gruendling, T. A1 - Schmid, Christina A1 - Falkenhagen, Jana A1 - Barner-Kowollik, C. T1 - Facile conversion of RAFT polymers into hydroxyl functional polymers: a detailed investigation of variable monomer and RAFT agent combinations N2 - We report the systematic investigation of a recently introduced one-pot radical transformation of methacrylate and acrylate-type polymers prepared via reversible addition fragmentation chain transfer (RAFT) polymerization into hydroxyl functional polymers. The simple reaction procedure involves stirring a solution of the RAFT functional polymer and an azo-initiator in tetrahydrofuran at elevated temperatures (T = 60 °C) in the presence of ambient air. Subsequent reduction of the formed hydroperoxide functional polymers to hydroxyl functional polymers is achieved in a one-pot procedure using triphenylphosphine. Polymers investigated in the current study are poly(methyl acrylate) (pMA), poly(butyl acrylate) (pBA), poly(isobornyl acrylate) (piBoA) and poly(tert-butyl acrylate) (ptBA) carrying a dithiobenzoate or phenyldithioacetate end terminius as well as a symmetrical trithiocarbonate mid chain function. Quantitative conversion into the hydroperoxyl and hydroxyl terminated product is observed when trithiocarbonate functional polymers are employed. In the case of dithiobenzoate and phenyldithioacetate functional acrylic polymers, some minor side products due to the oxidation of the RAFT end-group are generated. Size exclusion chromatography (SEC) and size exclusion chromatography–electrospray mass spectrometry (SEC-ESI-MS) were employed to monitor the progress of the reaction and to investigate the proposed reaction mechanism for the model polymers. When trithiocarbonate functional polymers are employed in the transformation reaction, the SEC analysis shows a bisection of the initial Mn. Collision induced dissociation (CID) MS experiments of the intermediate reaction products were conducted to gain in-depth information about the chemical structure. The new backbone linked hydroxyl group provides a versatile anchor for chemical end-group conversions and conjugation reactions with RAFT prepared polymers, alleviating problems with the rather limited ability of the dithioester end-group to undergo non-radical transformations. KW - Polymers KW - RAFT KW - SEC/ESI-mass spectrometry KW - CID-MS PY - 2010 DO - https://doi.org/10.1039/b9py00273a SN - 1759-9954 SN - 1759-9962 VL - 1 IS - 5 SP - 634 EP - 644 AN - OPUS4-21907 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Hyphenated Characterization TEchniques for Polymers: From LC/MALDI- and UPLC/ESI-TOF-MS to CID tandem mass spectrometry T2 - 11th Int. Symp. on Hyphenated Techniques in Chromatography CY - Amsterdam, Netherlands DA - 2010-01-27 PY - 2010 AN - OPUS4-21965 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Hyphenated techniques for copolymer characterization with the focus on 2D-LC / mass spectrometry T2 - 5th Int.Symp. on the Separation and Characterization of Natural and Synthetic Macromolecules CY - Amsterdam, Netherlands DA - 2011-01-25 PY - 2011 AN - OPUS4-22657 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Falkenhagen, Jana T1 - Copolymer characterization by coupled LC - MS/MS techniques T2 - 2010 International Chemical Congress of Pcific Basin Societies CY - Honolulu, HI, USA DA - 2010-12-15 PY - 2010 AN - OPUS4-22831 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -