Citation: WANG Pingping, ZHANG Hongzhi. PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A, BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION[J]. Chinese Journal of Polymer Science, ;1989, 7(1): 9-15. shu

PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A, BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION

WANG Pingping ^{*，张鸿志} ,
ZHANG Hongzhi

Received Date: 10 July 1987

Four series of copolyesters were synthesized by direct polycondonsation reaction between aromatic dicarboxylic acids and bisphenols by using tosyi chloride and N, N-dimethylformamide ( DMF ) in pyridine under mild conditions. The electron-rich hydroxyl groups of bisphenols favoured the polycondensation reaction and the order of relative reactivities of bisphenols is as follow: bisphenoI-A> hydroquinone ～ bisphenol-S> chlorohydroquinone. The mesomorphic properties of copolyesters were examined by birefringence under polarzing microscope,melt transparency,DSC and X-ray diffraction.The minimum molar fraction of mesogenic units needed for the appearance of liquid crystallinity is not higher than0.1 despite of the different varieties and lengths of the spacers studied.
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