膜
聚砜
聚结(物理)
聚丙烯腈
材料科学
多孔性
醋酸纤维素
聚合物
化学工程
化学
相位反转
相(物质)
有机化学
复合材料
工程类
物理
天体生物学
生物化学
作者
Lute Broens,F.W. Altena,C.A. Smolders,D.M. Koenhen
出处
期刊:Desalination
[Elsevier]
日期:1980-01-01
卷期号:32: 33-45
被引量:155
标识
DOI:10.1016/s0011-9164(00)86004-x
摘要
In this report we give a description of the membrane formation mechanism based on theoretical and experimental knowledge of phase separation phenomena in concentrated polymer solutions. We demonstrate that different types of phase separation are responsible for the build-up of the dense skin layer and the porous supporting layer in asymmetric membranes of several materials: cellulose acetate, polysulfone polyacrylonitrile and polydimethylphenylene-oxide. The formation of the porous sublayer will be explained in terms of liquid-liquid phase separation, coalescence and gelation. Special attention will be paid to the formation mechanism of the finger-like cavities in the sublayer. A possible explanation will be given on thermodynamic and kinetic grounds, for the formation of nodular structures in the skin of the membranes.
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