PET-HBT热致液晶嵌段共聚酯的合成及表征

SYNTHESIS AND CHARACTERIZATION OF PET-HBT THERMOTROPIC LIQUID CRYSTAL BLOCK COPOLYESTER

首先以对苯二甲酸双β-羟乙酯与过量的对苯二甲酰氯合成了酰氯基封端的ET齐聚物,并以过量的双对羟基苯甲酸丁二醇酯与对苯二甲酰氯合成了酚羟基封端的齐聚物HBT。而后,以四氯乙烷为溶剂,采用溶液缩聚法以ET和HBT为原料,合成嵌段共聚酯(PET-HBT)。用偏光显微镜、1H-NMR、WAXD及FT-IR表征了嵌段共聚酯的微观结构及结晶行为。在一定的温度范围内,该共聚酯是热致液晶高聚物。

Oligomer HBT was synthesized with superfluous BBHB and terephthaloyl chloride by solution polycondensation. The block copolymers PETHBT was synthesized with ET which was prepared with oligomer HBT, phydroxybenzoic acid bis(βhydroxyethylate) and superfluous TPC, using tetrachloroethane as solvent. The microstructures, crystalline behavior of this block copolymers were characterized by means of polarized microscope,1HNMR,WAXD,IR. The experimental results show that the copolyester exhibits nematic liquid crystallinity. In a certain scope of temperature, the copolyester shows good liquid crystallinity.