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

WANG Pingping; ZHANG Hongzhi

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

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- PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A, BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION
- Vol. 7, Issue 1, Pages: 9-15(1989)
- Affiliations：
  
  1. Department of Chemistry, Peking University,Beijing
  2.   Peking University
  3.   Peking University Beijing P·O·Box 10041
  4.   China
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：20 March 1989
- Accepted：
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[1]汪平平,张鸿志.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,{4}(01):9-15.

WANG Pingping, ZHANG Hongzhi. PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A, BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION[J]. 1989, 7(1): 9-15.
[1]汪平平,张鸿志.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,{4}(01):9-15. DOI：

WANG Pingping, ZHANG Hongzhi. PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A, BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION[J]. 1989, 7(1): 9-15. DOI：

摘要

<正> 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 polarizing 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 than 0. 1 despite of the different varieties and lengths of the spacers studied.

Abstract

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 polarizing microscope

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