Effect of concentration gradient on the thermal-induced phase separation phenomenon in polymer solutions
Effect of concentration gradient on the thermal-induced phase separation phenomenon in polymer solutions
复制标题
浓度梯度对聚合物溶液中热致相分离现象的影响
DOI：
10.1088/0965-0393/14/1/004
复制
发表时间：
2006
影响因子：
1.8
通讯作者：
P. K. Chan
中科院分区：
文献类型：
--
作者：
P. K. Chan
研究了线性浓度梯度下聚合物溶液中的热诱导相分离现象。一维模型包括Cahn-Hilliard理论的SD，并结合Flory-Huggins自由能方程，慢模式迁移率理论和Rouse模型的聚合物扩散。该模型是能够复制经常报告的实验观察文献中报道，其中包括使用TIPS方法形成各向异性聚合物膜。我们表明，并解释，各向异性的形态是由于聚合物溶液进行SD在不同的速度沿着样品作为初始浓度梯度的结果。
This paper studied the thermal-induced phase separation (TIPS) phenomenon via spinodal decomposition (SD) in a polymer solution under a linear concentration gradient. The one-dimensional model consists of the Cahn–Hilliard theory for SD and incorporates the Flory–Huggins free energy equation, the slow mode mobility theory and Rouse model for polymer diffusion. The model is able to replicate frequently reported experimental observations reported in the literature, which includes the formation of anisotropic polymer membranes using the TIPS method. We show and explain that the anisotropic morphology is due to the polymer solution undergoing SD at different rates along the sample as a result of the initial concentration gradient.