【摘要】 用柔性连接点联系的刚棒模型代表半刚性链分子,对其进行统计热力学分析。半刚性链分子的混合自由能是克分子分数、溶质分子的长径比、链分子的有序度、刚柔性以及温度的函数。溶液体系具有极小浓度V₂^*。当V₂^*<V₂^*时,混合自由能随有序度的减小而单调下降。V₂>V₂^*是获得稳定的各向异性相的必要条件。V₂^*是链分子的长径比、刚柔性及温度的函数。V₂是溶液浓度。更多还原

【Abstract】 A free energy of mixing for a system of semi--rigid chain with partial order is de-rived through the use of a modified rigid--rod model. A general expression of the min-imum concentration V₂^? is obtained by minimizing the free energy of mixing. ForV2<V₂^?, the mixing free energy decrease monotonically with order paremeter. Hence, anecessary condition for existence of a stable anisotropic phase is V₂>V₂^? The mini-mum concentration is a function of axis ratio of the solute particles, temperature andthe characteric stiffness of semi--rigid chain molecules.更多还原