摘要
热致性共聚酯液晶由于具有优异的热、机械及加工等性能,引起人们对其应用及基础研究的重视。本实验室曾对以不同长度碳链为软间隔段的共聚酯进行了研究,在产物介晶单元含量不高(约20％)时即可表现出明显液晶性。本文选用以双酚A(BPA)或双酚S(BPS)-对苯二甲酸酯为间隔段进行了研究。
Two series of copolyesters based on p-acetoxybenzoic acid (Ac-HBA), terephthalic acid(TA) and bisphenol A diacetate(Ac-BPA) or bisphenol S diacetate (Ac-BPS) were prepared by melt polycondensation technique. The copolyesters in a certain extent of compositions were thermotropic with wide liquid crystalline temperature ranges. The minimum amount of mesogenic units derived from Ac-HBA in feed necessary for the appearance of mesomorphic phase is about 10 % mol. Tgs of BPA series copolyesters were essentially constant and close to that of polymer of rigid spacer regardless of compositions. But the Tfs showed a minmum value towards the compositions.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第2期218-220,共3页
Chemical Journal of Chinese Universities
基金
国家科学基金
关键词
液晶
共聚酯
玻璃化温度
Liquid crystalline copolyesters, Terephthalate of bisphenols as rigid Spacer, Glass transition Temperature
