期刊
EUROPEAN POLYMER JOURNAL
卷 87, 期 -, 页码 84-98出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2016.12.012
关键词
Copolyesters synthesis; Structure-properties relationship; Thermal property; Isodimorphism; Thermal stability; Co-crystallization
资金
- European's Union 7th Framework Program for Research, Technological Development and Demonstration [311815]
Fully biobased aliphatic random poly(butylene succinate-ran-butylene adipate) (PBSA) copolyesters and the corresponding homopolyesters (poly(butylene succinate) (PBS) and poly(butylene adipate) (PBA)) with high molar mass, were synthesized with different succinic acid/adipic acid (SA/AA) molar ratio by transesterification in melt, using, titanium (IV) isopropoxide as an effective catalyst. All synthesized copolyesters were fully characterized by various chemical and physicochemical techniques including NMR, SEC, FTIR, WAXS, DSC and TGA. The final copolyesters molar compositions were identical to the feed ones. The different sequences based on succinate and adipate were randomly distributed along the chains. All the corresponding copolyesters showed an excellent thermal stability with a degradation onset temperature higher than 290 degrees C and a thermal degradation profile driven by the major diacid component. Glass transition temperatures of copolyesters decreased with the adipate content due to the decrease of the chain mobility, following the Gordon-Taylor relation. PBSA showed a pseudo-eutectic melting behavior characteristic of an isodimorphic character. Besides, the presence of both crystalline phases was observed for adipate content in the range 50-60 mol.%. (C) 2016 Elsevier Ltd. All rights reserved.
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