Numerical Simulation of Surface Effects on Spinodal Decomposition in Polymer Binary Mixture: Quench Depth Dependence
Numerical Simulation of Surface Effects on Spinodal Decomposition in Polymer Binary Mixture: Quench Depth Dependence
复制标题
DOI：
10.1021/ma0524878
复制
发表时间：
2006-02
期刊：
影响因子：
5.5
通讯作者：
Li-Tang Yan;Xu-Ming Xie
中科院分区：
文献类型：
--
作者：
Li-Tang Yan;Xu-Ming Xie
采用Cahn-Hilliard-Cook（CHC）理论和Flory-Huggins-deGennes理论对不同淬灭深度的二元高分子混合物的表面定向旋节线分解（SDSD）进行了数值模拟.讨论了不同淬火深度下润湿层的形成机理。模拟结果表明，随着淬火深度的增加，润湿层的生长可以表现出纯扩散限制生长律、对数生长律和Lifshitz−Slyozov（LS）生长律，这与实验结果吻合.此外，这三个区域的详细范围确定的基础上模拟结果。当χN < 2.01时，润湿层的生长规律为纯扩散限制生长规律。在2.08 ≤ χN时，润湿层的生长服从LS生长规律。而当2.01 ≤ χN < 2.08时，润湿层的增长规律更符合对数增长规律。模拟结果还表明，聚合物形态的演变，
The surface-directed spinodal decomposition (SDSD) in binary polymer mixture with different quench depths is investigated by numerical simulations, combining Cahn−Hilliard−Cook (CHC) theory with Flory−Huggins−de Gennes theory. The formation mechanisms of the wetting layer with different quench depths are discussed. The simulated results demonstrate that the growth of the wetting layer can exhibit pure diffusion-limited growth law, logarithm growth law, and Lifshitz−Slyozov (LS) growth law with the increasing quench depth, which reproduces experimental observations. Furthermore, the detailed ranges of these three regimes are determined on the basis of simulated results. The growth law of the wetting layer is pure diffusion-limited growth law when χN < 2.01. In the case of 2.08 ≤ χN, the growth of the wetting layer obeys LS growth law. However, when 2.01 ≤ χN < 2.08, the logarithm growth law of the wetting layer is favored. The simulated results also demonstrate that the evolution of the polymer morphology ...