| PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS |
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| 作者姓名： | 王勇 吴大诚 李瑞霞 |
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| 作者单位： | Textile College，Chengdu University of Science and Technology，Chengdu 610065，Textile College，Chengdu University of Science and Technology，Chengdu 610065，Textile College，Chengdu University of Science and Technology，Chengdu 610065 |
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| 摘 要： | The properties and structures of thermotropical liquid crystalline copolyesters basedon p-hydroxybenzoic acid (PHBA), terephthalic acid (TPA) and bisphenol A (BPA) werestudied by DSC, WAXD, hot stage polarized microscopy and NMR. It was found that mostof the copolyesters were soluble in many common organic solvents. The copolyesters hadfow T_m/T_f values and a broad range of liquid crystal phase, making the polymers readilymelt-processable. The effects of annealing at different temperatures on the copolyestercontaining 33% PHBA were also discussed. It was noted that annealing at ca. 200℃(below Tc - n) could lead to the increasing of the crystallinity of the copolyester while themicrostructure and sequence structure had not changed. Annealing at ca.280℃ (nearTc - n) could bring a change of crystal and sequence structure and simultaneously madethe ndcrodomains be ordered more perfectly.
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| 收稿时间： | 1995-12-20 |
PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS |
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| WANG Yong,WU Dacheng,LI Ruixia.PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS[J].Chinese Journal of Polymer Science,1997,0(2):123-128. |
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| Authors: | WANG Yong WU Dacheng LI Ruixia |
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| Institution: | Textile College; Chengdu University of Science and Technology; Chengdu 610065 |
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| Abstract: | The properties and structures of thermotropical liquid crystalline copolyesters basedon p-hydroxybenzoic acid (PHBA), terephthalic acid (TPA) and bisphenol A (BPA) werestudied by DSC, WAXD, hot stage polarized microscopy and NMR. It was found that mostof the copolyesters were soluble in many common organic solvents. The copolyesters hadfow Tm/Tf values and a broad range of liquid crystal phase, making the polymers readilymelt-processable. The effects of annealing at different temperatures on the copolyester containing 33% PHBA were also discussed.It was noted that annealing at ca.200℃ (belowTc-n could lead to the increasing of the crystallinity of the copolyester while the microstructure and sequence structure had not changed.Annealing at ca.280℃ (near Tc-n) could bring a change of crystal and sequence structure and simultaneously made the microdomains be ordered more perfectly. |
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| Keywords: | Liquid cyrstalline copolyester Characterization Microstructure NMR |
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