A 2 STEP MECHANISM OF DIFFUSION-CONTROLLED ETHYLENE VINYL ALCOHOL MEMBRANE FORMATION

被引：51
|
作者：
YOUNG, TH [1 ]
CHEN, LW [1 ]
机构：
[1] NATL TAIWAN UNIV,DEPT CHEM ENGN,TAIPEI 10764,TAIWAN
来源：
JOURNAL OF MEMBRANE SCIENCE | 1991年 / 57卷 / 01期
关键词：
MEMBRANE PREPARATION AND STRUCTURE; 2 STEP MECHANISM MODEL; PHASE TRANSITION; ETHYLENE VINYL ALCOHOL MEMBRANE;
D O I：
10.1016/S0376-7388(00)81163-1
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The coagulation of ethylene vinyl alcohol (EVAL) copolymer membranes was investigated with a solvent/nonsolvent mixture. A two step mechanism model is presented which describes mass transfer processes occurring for specified membrane formation systems. The various morphology structures can be reasonably explained by this model by changing the solvent content of the coagulation bath. It clearly shows that the membrane structure actually depends on the local composition at phase transition and is controlled mainly by kinetic and structural factors rather than thermodynamic equilibrium. This model also points out some aspects neglected of membrane formation in published research. This analysis provides better understanding and correct control of membrane formation techniques.
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页码：69 / 81
页数：13
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