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The effect of segment length on some properties of thermoplastic poly(ester-siloxane)s : Eine Untersuchung zum Einfluss des Segmentanteils auf einige Eigenschaften thermoplastischer Polyestersiloxane

A series of novel thermoplastic elastomers, based on poly(dimethylsiloxane) (PDMS) as the soft segment and poly(butylene terephthalate) (PBT) as the hard segment, were synthesized by catalyzed two-step, melt transesterification reactions of dimethyl terephthalate and methyl esters of carboxypropyl-t... Full description

Contained in: Polymer International Vol. 52, No. 7 (2003), p. 1188-1197
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Links: Additional Link (dx.doi.org)
ISSN: 1097-0126
Additional Keywords: ELASTOMER
POLYDIMETHYLSILOXAN
SILICON:POLYMER
THERMOPLAST
DOI: 10.1002/pi.1241
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 10 Seiten, 8 Bilder, 5 Tabellen, 29 Quellen
ID (e.g. DOI, URN): 10.1002/pi.1241
PPN (Catalogue-ID): WTI040654796
Note: WTI TEMA DB
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520 |a A series of novel thermoplastic elastomers, based on poly(dimethylsiloxane) (PDMS) as the soft segment and poly(butylene terephthalate) (PBT) as the hard segment, were synthesized by catalyzed two-step, melt transesterification reactions of dimethyl terephthalate and methyl esters of carboxypropyl-terminated poly(dimethylsiloxane)s (Mn = 550-2170 g/mol) with 1,4-butanediol. The lengths of both the hard and soft segments were varied while the weight ratio of the hard to soft segments in the reaction mixture was maintained constant (57/43). The molecular structure, composition and molecular weights of the poly(ester-siloxane)s were examined by 1H NMR spectroscopy. The effectiveness of the incorporation of the methyl-ester-terminated poly(dimethylsiloxane)s into the copolymer chains was verified by chloroform extraction. The effect of the segment length on the transition temperatures (Tm and Tg) and the thermal and thermo-oxidative degradation stability, as well as the degree of crystallinity and hardness properties of the synthesized TPESs, were studied. 
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