FORMATION OF ASYMMETRIC POLYSULFONE MEMBRANES BY IMMERSION PRECIPITATION .2. THE EFFECTS OF CASTING SOLUTION AND GELATION BATH COMPOSITIONS ON MEMBRANE-STRUCTURE AND SKIN FORMATION

被引:143
作者
RADOVANOVIC, P [1 ]
THIEL, SW [1 ]
HWANG, ST [1 ]
机构
[1] UNIV CINCINNATI,DEPT CHEM ENGN,ML-171,CINCINNATI,OH 45221
关键词
DIFFUSION; MEMBRANE PREPARATION AND STRUCTURE; MICROPOROUS AND POROUS MEMBRANES; FLUX RATIO;
D O I
10.1016/0376-7388(92)87025-S
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The effects of casting solution and gelation bath compositions on the structure of membranes produced from the system polysulfone-N,N-dimethylacetamide-2-propanol have been studied. Membranes were prepared by immersion precipitation with no evaporation step. Membrane structures were determined by scanning electron microscopy. The observations are analyzed in the light of predictions made using the model developed in Part I of this study [J. Membrane Sci., 65 (1992) 213]. The concept of the critical flux ratio is introduced to facilitate the analysis of the phenomena leading to skin formation of asymmetric membranes. This concept provides the means for predicting, based on casting conditions, whether or not a membrane will have a dense skin.
引用
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页码:231 / 246
页数:16
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