含对羟基苯甲酸热致液晶共聚酯的合成与性质

Synthesis and Properties of Thermotropic Liquid Crystalline Copolyester Containing 4-Hydroxybenzoic Acid

采用偏苯三甲酸酐与１，６－己二胺制备了Ｎ，Ｎ′－己（１，６）二烷基－双偏苯三甲酸酰亚胺，并以此二酸与４，４′－二羟基二苯酮、对羟基苯甲酸、对苯二甲酸经直接熔融缩聚合成了系列共聚酯，所得聚合物经偏光显微镜、差示扫描量热计、广角Ｘ－射线衍射仪表征具有向列型液晶特征．

A dicarboxylic acid, N,N′-hexane-1,6-diylbis(trimellitimide), was prepared by the reaction of trimellitic anhydride with 1,6-hexane diamine. From the diacid, a series of copolyesters had been synthesized by thermal condensation with bis(4-hydroxyphenyl) ketone, p -hydroxybenzoic acid and different molar ratio of terephthalic acid. Properties of the resulting copolyesters were characterized by polarized light microscopy, differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD). All the copolyesters could form a nematic phase over a wide temperature range above their melt.