期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 81, 期 9, 页码 2219-2226出版社
JOHN WILEY & SONS INC
DOI: 10.1002/app.1659
关键词
poly(butylene succinate); epoxidation; crosslinking; biodegradability
N-hexenyl side branches were introduced into poly(butylene succinate) (PBS) by polymerization of succinic acid (SA) with 1,4-butanediol (BD) in the presence of 7-octene-1,2-diol (OD). Thermal properties and biodegradability of the aliphatic polyesters were investigated before and after epoxidation of the pendant double bonds. The glass-transition temperature (T-g) decreased with the branching density to give a minimum at 0.03 mol of branching units per mole of structural units. Thereafter, T-g increased due to the in, situ crosslinking of the unsaturated groups during the differential scanning calorimetry (DSC) measurements. N-Hexenyl side branches decreased melting temperature (T-g) more significantly than ethyl side branches, but the effect was on par with that by n-octyl branches. Epoxidation of the double bonds decreased T-m and melting enthalpy (DeltaH(m)), but increased T-m of the aliphatic polyester. Biodegradability was enhanced to some extent by the presence of n-hexenyl side branches. However, the epoxidation of the unsaturated groups did not notably affect the biodegradability. (C) 2001 John Wiley & Sons, Inc.
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