刚性棒状全芳香液晶聚酯的合成及性质的研究

STUDY ON SYNTHESIS AND PROPERTIES OF WHOLLY AROMATIC LC POLYESTERS WITH RIGID AND RODLIKE STRUCTURE

以溴和苯基取代的对苯二甲酰氯及 2 ,2′-二甲基联苯 - 4 ,4′-二甲酰氯作为单体 ,分别与甲基、叔丁基、苯基取代的对苯二酚经熔融缩聚反应 ,合成一类具有刚性棒状结构的全芳香液晶聚酯。聚酯的热性质以 TGA、DSC、热台偏光显微镜研究。所有的聚酯均为热致性液晶 ,它们具有相对较低的转变温度 。

Bromo and phenyl substituted terephthaloyl dichloride and 2,2′ dimethylbiphenyl 4,4′ dicarbonyl dichloride were used as monomers, which react respectively with methyl. t butyl and phenyl hydroquinones by melt polycondensation, a kind of wholly aromatic polyesters were synthesized, which have rigid and rodlike structures. All of the polyesters are thermotropic liquid crystals. The thermal propeties of the polyesters were investigated with TGA, DSC and polarizing microscope. All polyesters have low phase transition temperature, they have good solubilities in common organic solvents.