| PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A,BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION |
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| 作者姓名： | 汪平平 张鸿志 |
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| 作者单位： | Department of Chemistry，Peking University，Department of Chemistry，Peking University Beijing P·O·Box 10041，Beijing，China，Beijing |
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| 摘 要： | 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.
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| 收稿时间： | 1987-07-10 |
PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A, BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION |
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| 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,1989,0(1):9-15. |
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| Authors: | WANG Pingping ZHANG Hongzhi |
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| Institution: | Department of Chemistry; Peking University; Peking University Beijing P·O·Box 10041; Beijing; China |
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| 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 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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