A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS) - Evidence and mechanism of formation
A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS) - Evidence and mechanism of formation
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DOI：
10.1016/j.memsci.2007.11.016
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发表时间：
2008-03-05
影响因子：
9.5
通讯作者：
Dupuy, C.
中科院分区：
文献类型：
--
作者：
Menut, P.;Su, Y. S.;Dupuy, C.
通过多种原位研究方法，包括用于定性方法的光学显微镜和动态水接触角测量，以及用于定量方法的拉曼共焦和 FTIR 显微镜，在水蒸气诱导相分离 (VIPS) 过程中清楚地证明了由聚醚酰亚胺 (PEI) 和 N-甲基吡咯烷酮 (NMP) 制成的成膜系统顶部表面液体层的形成。提出了一种涉及从富聚合物相收缩到表面相分离的机制，以解释表面液体层中明显高浓度的 PEI。讨论了相分离过程中表面液体层的出现对使用 VIPS 制造的膜的形态的影响以及它与液体诱导相分离的对比。 (C) 2007 Elsevier B.V. 保留所有权利。
The formation of a surface liquid layer on the top of membrane forming systems made of poly(ether-imide) (PEI) and N-methylpyrrolidone (NMP) was clearly demonstrated during water vapor-induced phase separation (VIPS) through several in situ investigation methods including optical microscopy and dynamic water contact angle measurements for a qualitative approach, and Raman confocal and FTIR microscopy for a quantitative one. A mechanism involving the shrinkage from the polymer-rich phase consecutively to the surface phase separation is proposed to account for the significantly high concentration of PEI in the surface liquid layer. The emergence of a surface liquid layer during the phase separation process is discussed in terms of implications on morphology of membrane fabricated using VIPS and how it contrasts with liquid-induced phase separation. (C) 2007 Elsevier B.V. All rights reserved.