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 OPUS4-11905 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 OPUS4-11357 Zeitschriftenartikel Weidner, Steffen; Kühn, Gerhard; Werthmann, Barbara; Schröder, Hartmut; Just, Ulrich; Borowski, Renate; Decker, Renate; Schwarz, Bärbel; Schmücking, I.; Seifert, Ingetraut A new approach of characterizing the hydrolytic degradation of poly(ethylene terephthalate) by MALDI-MS The hydrolytic degradation of technical poly(ethylene terephthalate) (PET) was investigated by means of different methods such as size-exclusion chromatography (SEC), viscometry, light-scattering, thin-layer chromatography, end-group titration, and matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). The long-term degradation was simulated by exposing PET filament yarns to aqueous neutral conditions at 90°C for up to 18 weeks. By means of MALDI-MS and thin-layer chromatography, the formation of different oligomers was obtained during polymer degradation. As expected, an ester scission process was found generating acid terminated oligomers (H-[GT]m-OH) and T-[GT]m-OH and ethylene glycol terminated oligomers (H-[GT]m-G), where G is an ethylene glycol unit and T is a terephthalic acid unit. Additionally, the scission of the ester bonds during the chemical treatment led to a strong decrease in the number of cyclic oligomers ([GT]m). The occurrence of di-acid terminated species demonstrated a high degree of degradation. Hoboken, NJ Wiley 1997 Journal of polymer science A, polymer chemistry 35 11 2183 2192 10.1002/(SICI)1099-0518(199708)35:11<2183::AID-POLA9>3.0.CO;2-Z 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