高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (11): 1756.

• 论文 • 上一篇    下一篇

氢键诱导侧链液晶高分子的分子理论

晏华1, 李伯耿2, 李宝芳2, 潘祖仁2   

  1. 1. 重庆后勤工程学院油化系, 重庆 400016;
    2. 浙江大学聚合反应工程国家重点实验室, 杭州 310027
  • 收稿日期:1999-06-16 出版日期:2000-11-24 发布日期:2000-11-24
  • 通讯作者: 晏　华(1963年出生),男,博士,副教授,主要从事超分子液晶研究.
  • 基金资助:

    聚合反应工程国家重点实验室开发基金(批准号:9917025);重庆市科委应用基础研究基金(批准号:991025016)资助

A Theoretical Model of Supramolecular SLCP Induced by H-bonds

YAN Hua1, LI Bo-Geng2, LI Bao-Fang2, PAN Zu-Ren2   

  1. 1. Department of Petrochemistry, Logistic Engineering University, Chongqing 400016, China;
    2. State Key Lab. of Polymerization Engineering, Zhejiang University, Hangzhou 310027
  • Received:1999-06-16 Online:2000-11-24 Published:2000-11-24

PDF (PC)

被引次数

12

摘要： 将自组装概念引入Flory-Huggins格子理论,导出定向混合的氢键诱导侧链液晶高分子体系在各向同性相的混合自由能和各组分的化学势;由Maier-Saupe平均场理论给出在向列相的混合自由能和各组分的化学势,建立了氢键诱导侧链液晶高分子的分子理论模型.计算结果表明,由于氢键的方向性和饱和性决定自组装体中主客体的容纳能力,在相图上出现一个峰值;提高氢键相互作用参数和增加羧基含量,不仅自组装体的热稳定性增加,而且峰值向小分子含量低的方向移动;聚合物分子量对自组装体的热稳定性影响存在一个临界值,超过临界值后,热稳定性与分子量无关.

关键词: 氢键, 自组装, 液晶分子理论

Abstract: The supramolecular SLCP induced by H-bonds is an oriented blend. By introduction of the self assembly into Flory Huggins theory, the free energy of mixing and chemical potential of components in isotropic phase were described. The free energy of mixing and chemical potential of components in nematic phase were calculated based on Maier-Saupe theory. The theoretical model on the equilibrium phase diagram of the oriented blend was thus set up. Direction and saturation of hydrogen bonds in self-assembly determine the capability of Host-Guest complex. This is a balance point at which the supramolecule has the highest stability, the Ti is the highest, so there is a peak in the phase diagram. The factors which affect the capability of the Host-Guest complex balance point are the interaction parameter of hydrogen bonds and carboxyl concentration in the copolymer. The stability increases with increase in interaction parameter of H-bond and carboxyl concentration; furthermore, the peak shifts to a low concentration of low mass molecule. There is a critical value for the molecular weight, which affects the stability of mesophase. Over it, Ti is independent on the molecular weight, and the self-assembly is decoupled completely.

Key words: Hydrogen bonds, Self-assembly, Liquid crystalline molecular theory

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