刚柔相嵌液晶高分子的赝二级相变温度

PSEUDO SECOND ORDER PHASE TRANSITION TEMPERATURE OF NEMATIC POLYMERS WITH SPACERS

讨论了刚柔相嵌液晶高分子的向列相一各向同性相转变与其分子结构的关系．给出了该一级相变的赝二级相变温度Ｔ＊与这类液晶高分子的液晶基元和间隔基的长度、柔顺性（相关长度）以及它们之间的相互作用的关系的解析表示式．分析了液晶基元与间隔基连接处的表观弯曲（接口效应）对Ｔ＊的影响．文中的结论与实验相符．

The nematic-isotropic (N-I) transition of nematic polymers with semiflexible spacers was examined. The pseudo second order phase transition temperature,T*, of this transition was analytically expressed as a function of length of mesogens and spacers, persistence length of spacer chains and the interactions of andbetween mesogens and spacers. The hinge effect on T* of mesogens and spacersalong nematic polymer chains was envisaged, based on above theory. The predictions were in agreement with experiments.