| 含柔性间隔基团的主链型液晶高分子的分子场理论 |
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| 引用本文： | 王晓工,刘德山,周其庠.含柔性间隔基团的主链型液晶高分子的分子场理论[J].清华大学学报(自然科学版),1993(3). |
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| 作者姓名： | 王晓工 刘德山 周其庠 |
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| 作者单位： | 化学工程系
(王晓工，刘德山)，化学工程系(周其庠) |
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| 摘 要： | 研究了主链型液晶高分子中柔性间隔基因对聚合物结构和液晶性的影响规律。提出含柔性间隔基因液晶高分子中介品单元分子内取向的模型，及分子内取向分布和取向有序度参数等概念。探讨了分子内取向有序度参数和大分子中化学键的键角，内旋转二面角，内旋转位能等的定量关系。在上述概念和模型的基础上，提出了含柔性间隔基团液晶高分子的分子场理论。由此可从键角，内旋转二面角，内旋转位垒等结构参数计算液晶相变温度ＴＮＩ，取向有序度参数和热力学函数等。对上述理论的计算方法及应用也进行了讨论。理论和计算能较好地说明柔性间隔基团对ＴＮＩ等影响的规律。
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| 关 键 词： | 分子内取向 有序度参数 分子场理论 |
A molecular field theory for the liquid crystal polymer comprising flexible spacer |
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| Wang Xiaogong,Liu Deshan,Zhou Qixiang.A molecular field theory for the liquid crystal polymer comprising flexible spacer[J].Journal of Tsinghua University(Science and Technology),1993(3). |
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| Authors: | Wang Xiaogong Liu Deshan Zhou Qixiang |
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| Institution: | Department of Chemical Engineening |
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| Abstract: | The effect of flexible spacer on the spatial configuration, orientational order parameter and thermodynamic properties of main chain liquid crystal polymer is investigated theoretically. A new model and concepts such as the intra-molecular orientational distribution function, intramolecular orientational order parameter and correlation length are proposed to describe intra-molecular orientation of mesogenic units in the polymer chain. The relations between the intra-molecular order parameter and the bond angle, the bond rotation dihedral angle and the rotation potential are deduced. On this basis, a molecular field theory for the liquid crystal polymer with flexible spacer is developed. The calculation results and their experimental yerification are also discussed in detail. |
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| Keywords: | intra-molecular orientation order parameter molecular field theory |
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