文献类型：期刊文献

英文题名：Effect of molecular conformation changes on the phase behavior of liquid crystalline polymers

作者：Lin, JP; Zhou, DF

机构：[1]E China Univ Sci & Technol, Dept Polymer Sci & Engn, Shanghai 200237, Peoples R China

年份：1999

期号：4

起止页码：436

外文期刊名：ACTA POLYMERICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000082212800009)】；

语种：英文

外文关键词：Flory lattice model; liquid crystalline polymer; helix-coil transition

摘要：In the presence of denaturing solvent, solutions of polypeptide can be liquid crystalline at room temperature. They may undergo an anisotropic-isotropic transition at low temperatures where the intramolecular helix-coil transformation occurs. On the basis of Florys lattice model and Zimm-Bragg's notion for the helix-coil transition, a theory considering the above phenomenon has been proposed. In this work, such theory was further developed by replacing the axial ratio x with the Kuhn chain axial ratio x(k) which is temperature-dependent. The calculation results show that an improved agreement between the theory and the experimental data has been achieved, and an appreciable influence on the phase behavior from both chain rigidity and polymer-solvent interaction parameter X was found. Finally, the temperature effect on orientational parameter S was also studied. The information obtained through the investigation may find important applications, such as envisaging new routes for processing the rigid-flexible block copolymer with better mechanical properties, and helping to understand bioprocesses in the life phenomena.