非溶剂诱导相分离法制备的聚偏二氟乙烯微孔膜皮-亚层结构的三元相场模拟,ACS Omega

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非溶剂诱导相分离法制备的聚偏二氟乙烯微孔膜皮-亚层结构的三元相场模拟
ACS Omega ( IF 3.7 ) Pub Date : 2021-03-11 , DOI: 10.1021/acsomega.0c05982
Ping Fang ₁ , Chaoyu Yang ₁ , Ruihua Shao ₂ , Lihui Zhou ₃ , Kang Liu ₁

Affiliation

本文对基于非溶剂诱导相分离（NIPS）方法的现有相场模型进行了优化。使用聚偏二氟乙烯（PVDF）膜系统的相关参数进行了二维模拟，模拟并分析了初始浓度，浓度波动和溶剂扩散速率的变化对皮肤层和亚层的影响。膜的结构。这些模拟对通过NIPS方法制备PVDF微孔膜的过程进行了建模，以更好地了解不同条件下PVDF微孔膜的结构发展。发现在PVDF微孔膜的传质交换界面上形成了致密的表皮层，其数目随着浓度波动的减小而增加，这对子层的结构影响很小。PVDF的初始浓度和溶剂的扩散速率对表皮层的数量影响很小，但在表皮层的形成时间和子层的结构中起相对较大的作用。此外，通过相应的实验验证了该模型的有效性。因此，通过修改特定的热力学和动力学参数，该模型可以应用于其他PVDF三元膜系统。

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Ternary Phase-Field Simulations of the Skin-Sublayer Structures in Poly(vinylidene fluoride) Microporous Membranes Prepared by a Nonsolvent-Induced Phase Separation

In this paper, the existing phase-field model based on the nonsolvent-induced phase separation (NIPS) method was optimized. Two-dimensional simulations using the relevant parameters of a poly(vinylidene fluoride) (PVDF) membrane system were carried out, simulating and analyzing the effects of changes in initial concentrations, concentration fluctuations, and diffusion rates of the solvent on the skin layer and sublayer structures of the membranes. These simulations modeled the process of preparing PVDF microporous membranes by the NIPS method to better understand the structural development of PVDF microporous membranes under different conditions. It was found that dense skin layers were formed at the mass-transfer exchange interface of the PVDF microporous membranes, whose number increased with the decrease of the concentration fluctuation, which has little effect on the structure of the sublayer. The initial concentration of PVDF and the diffusion rate of the solvent had a little impact on the number of skin layers yet played a relatively large role in the formation time of the skin layers and the structure of the sublayers. Also, the validity of the model was verified by corresponding experiments. Hence, the model can be applied to other PVDF ternary membrane systems by modifying specific thermodynamic and kinetic parameters.

更新日期：2021-03-23

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