STUDIES ON THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS:POLY (ARYLENE TEREPHTHALATECO-HEXAMETHYLENE TEREFHTHALATE)

作     者：张鸿志 汪平平 冯新德 ZHANG Hongzhi WANG Pingping FENG Xinde (Department of Chemistry, Peking University, Beijing)

作者机构：Department of Chemistry Peking University Beijing 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学(英文版))

年 卷 期：1988年第6卷第2期

页      面：123-128页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

主　　题：Liquid crystalline copolyesters Poly(arylene terephthalate-co-hexamethylene terephthalate) Minimum mesogenic fraction Sequence distribution Microstrueture parameters/ 

摘      要：A series of copolyesters based on terephthaloyl chloride, hexamethylene glycol and hydroquinone or chlorohydroquinone were prepared. The copolymers showed composition-dependent liquid crystalline properties as verified by visual observation of stir-opalescence, polarizing microscope and DSC. The copolyesters with aromatic diol contents over a certain extent (x≥0.2) were thermotropic with wide liquid crystalline temperature ranges. Comparing with the copolyesters based on butylene glycol or ethylene glycol, the minimum fraction of aromatic diol (x value) used to get the liquid crystallinity for all these copolyesters is around 0.2 regardless of the chain lengths of aliphatic glycols. ~1H-NMP studies revealed that copolyesters have microstructure of block sequence distribution and the mesogenie segments shorter than triad with three phenyl nuclei will not provide the liquid crystallinity.