Comparison of Mobility Modes in Polymer Solutions Undergoing Thermal-Induced Phase Separation
Comparison of Mobility Modes in Polymer Solutions Undergoing Thermal-Induced Phase Separation
复制标题
热致相分离聚合物溶液中迁移模式的比较
DOI：
10.1557/proc-710-dd4.6.1
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
P. K. Chan
中科院分区：
文献类型：
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作者：
P. K. Chan
热致相分离法用于从聚合物溶液制备聚合物膜和聚合物分散液晶膜。所得形态由均匀分散在固体聚合物基质中的溶剂液滴组成。迄今为止，对聚合物溶液中热致相分离现象的建模和计算机模拟都将迁移率视为常数。本演示的目的是比较以下三种移动模式：（1）移动性作为一个常数，（2）移动性以下的快速模式理论，（3）移动性以下的慢速模式理论。我们目前的计算机模拟结果从模型组成的Cahn-Hilliard理论相分离，Flory-Huggins自由能密度的聚合物溶液，和上述三种迁移率模式。数值结果表明，有没有形成的形态的显着差异，唯一的差异发生在相分离时间。此外，数值结果表明，慢模和快模理论之间的唯一区别是一个因素的两倍，快模理论的流动性是慢模理论的两倍。
The thermal-induced phase separation method is used to fabricate polymer membranes and polymer-dispersed liquid crystal films from polymer solutions. The resultant morphology consists of solvent droplets dispersed uniformly in a solid polymer matrix. Up till now, the modeling and computer simulation of the thermal-induced phase separation phenomenon in polymer solutions have considered the mobility to be a constant. The objective of this presentation is to compare the following three mobility modes: (1) mobility as a constant, (2) mobility following fast mode theory, and (3) mobility following slow mode theory. We present computer simulation results from models composed of the Cahn-Hilliard theory for phase separation, Flory-Huggins free energy density for polymer solutions, and the three aforementioned mobility modes. The numerical results indicate that there is no significant difference in the morphology formed; the only difference occurs in the phase separation time. Furthermore, the numerical results show that the only difference between the slow and fast mode theories is a factor of two; the mobility of the fast mode theory is twice that of the slow mode theory.