聚砜
聚乙烯吡咯烷酮
膜
蒸馏水
铸造
相位反转
材料科学
聚合物
化学工程
高分子化学
复合材料
化学
色谱法
工程类
生物化学
作者
Ho-Taek Yeo,Sang-Taek Lee,Myeongjin Han
出处
期刊:Journal of Chemical Engineering of Japan
[The Society of Chemical Engineers Japan]
日期:2000-01-01
卷期号:33 (1): 180-184
被引量:69
摘要
Polymeric membranes were prepared from homogeneous solutions of two different mixtures: polysulfone (PSF)/dimethylformamide (DMF) and PSF/polyvinylpyrrolidone (PVP)/DMF. PSF solutions of 15 wt%, after cast on glass plates, were solidified either by direct immersion into distilled water or by 5-hr exposure under an environment of 72.5% relative humidity followed by immersion in a water bath. The prepared membranes are compared to each other on morphological and functional characteristics. In the vapor exposure process, the demixing rate of a cast solution film is enhanced with the addition of a polymer additive, PVP, in a casting solution. However, the enhancement of demixing rate did not result in an increase in water permeability or a significant morphology variation of the prepared membranes. On the contrary, when a cast film is coagulated by direct immersion into a water bath, the PVP in a solution film worked as a significant flux enhancer. It is concluded that at the specific concentration of 15 wt% polymer, PVP addition induces an increase in demixing rate of a casting solution, which results in an increase in permeability of the prepared membranes, only if the coagulation of a cast film is carried out in a nonequilibrium state.
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