| 液晶性共聚脂的分子结构与相变温度的关系 |
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| 引用本文： | 周其痒,黄健,潘智存,刘德山.液晶性共聚脂的分子结构与相变温度的关系[J].清华大学学报(自然科学版),1989(6). |
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| 作者姓名： | 周其痒 黄健 潘智存 刘德山 |
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| 作者单位： | 化学工程系
(周其痒，黄健，潘智存)，化学工程系(刘德山) |
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| 摘 要： | 应用ＤＳＣ和 Ｘ光衍射研究了１２种热致液晶性规则共聚酯。探讨了聚合物链结构与共聚酯从晶态向液晶态的相转变温度ＴＣＮ之间的关系。结果表明：共聚酯的ＴＣＮ随对数比浓粘度的增大而升高，然后趋于稳定；介晶单元的苯环上引入氯取代基可降低共聚酯的ＴＣＮ和结晶度：一般情况下，共聚酯的ＴＣＮ随介晶单元的增长而升高；柔性间隔基增长，共聚酯的ＴＣＮ先降低，然后升高。
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| 关 键 词： | 柔性间隔基 液晶 共聚酯 分子结构 相变温度 |
The Relationship between Molecular Structures of Liquid Crystalline Copolyesters and Transition Temperatures in Mesophase |
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| Zhou Qixiang,Huang Jian,Pan Zhicun,Liu Deshan.The Relationship between Molecular Structures of Liquid Crystalline Copolyesters and Transition Temperatures in Mesophase[J].Journal of Tsinghua University(Science and Technology),1989(6). |
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| Authors: | Zhou Qixiang Huang Jian Pan Zhicun Liu Deshan |
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| Institution: | Department of Chemical Engineering |
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| Abstract: | Twelve thermotropic liquid crystalline regular copolyesters were studied by using DSC and X-ray diffraction. The relationship between chain structures and transition temperatures T.. of copolyesters was investigated The results showed that T.M of copolyesters increases with increasing inherent viscosity and gradually becomes stable. Chloro-Substituent in aromatic ring of mesomorphic unit can decrease To. and crystallinity of copolyesters. In general, To. of copolyesters increases with increasing length of mesomorphic unit. T.. decreases at first and then increases as the length of flexible spacer increases. |
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| Keywords: | flexible spacer liquid crystal copolyester molecular structure transition temperature of mesophase |
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