Zhang Bao-yan
2007
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Journal
Polymer Materials Science and Engineering
Abstract
Bis(p-hydroxybenzonic acid) butanediolate(BBHB)as mesogenic unit was prepared with methyl-p-hydroxybenzoate,1,4-butanediol and catalyzer by melting transesterification.Then liquid crystalline polymer was synthesized with excessive terephthaloyl chloride and BBHB by solution polycodensation,using tetrachloroethane as solvent.Thermotropic main-chain liquid crystalline polymer was synthesized.This liquid crystalline polymer was characterized by means of FT-IR.Photographs of polarizing microscope show that this liquid crystalline polymer is nematic liquid crystalline polymer.The chemical structure,thermal properties and liquid crystalline character of polymers P1~P3 were analyzed with IR,POM,DSC and WAXD,the final result shows the polymers P1~P3 are kinds of nematic liquid crystals,able to keep the state of liquid crystal properties unless reach to each decomposed temperatures.