Diffusion Process during Drying to Cause the Skin Formation in Polymer Solutions
Diffusion Process during Drying to Cause the Skin Formation in Polymer Solutions
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DOI：
10.1143/jjap.45.8817
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发表时间：
2006-11
影响因子：
1.5
通讯作者：
Kin'ya Ozawa;T. Okuzono;M. Doi
中科院分区：
文献类型：
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作者：
Kin'ya Ozawa;T. Okuzono;M. Doi
讨论了聚合物在自由表面蒸发时聚合物溶液中的扩散过程，得到了一维运动边界条件下的扩散型方程。考虑到溶液凝胶化（或凝固）的影响，我们对一维模型进行了数值模拟。基于数值结果，我们详细描述了由于表面凝胶而形成“皮肤”的相关条件。此外，我们还表明，聚合物溶液的干燥动力学与凝胶作用密切相关，凝胶作用导致聚合物的扩散系数大大增加。
We discuss the diffusion process of polymers in polymer solution undergoing evaporation of the solvent at the free surface, and obtain a diffusion-type equation with a moving boundary condition in one dimension. Taking into account the effect of gelation (or solidification) of the solution, we carry out numerical simulations of the one-dimensional model. Based on the numerical results, we present a detailed description of the condition related to the “skin” formation due to the surface gelation. Furthermore, we also show that the drying dynamics of polymer solutions is strongly related to a gelation, which causes a great increase of diffusion coefficient of polymers.