对羟基苯甲酸（PHB）改性共聚酯的序列结构

摘要

Copolyester（PHB-PET） modified by PHB was synthesized by direct esterification of PTA. The molecular structure of copolyester was signed and the sequence structure was calculated through analysis of NMR. It indicated that： PHB and PET were random copolymer%采用PTA路线制得PHB．PET共聚酯，通过核磁（NMR）分析来表征共聚产物的分子结构，并计算出共聚酯产物的序列结构。NMR表征结果表明：PHB—PET共聚酯中PHB与PET为无规共聚，PHB自聚比率0．06左右，自聚分子数均序列长度在1．06左右，且由于PHB的反应活性较低，未能完全参与和PET的共聚反应。用PHB制得4，4＇-对苯二甲酰二氧二苯甲酸（TOBA），在TOBA—PET体系中，自聚比率0．1左右，自聚分子数均序列长度在1．11左右。