膜蒸馏用聚偏氟乙烯微孔膜的结构控制 Ⅱ.凝固浴对膜形态结构的影响  

STRUCTURAL CONTROL OF MICROPOROUS PVDF MEMBRANES FOR MEMBRANE DISTILLATION—EFFECT OF COAGULATION BATH ON THE MORPHOLOGY OF THE MEMBRANES

作　　者：孔瑛[1] 吴庸烈[1] 杨金荣[1] 彭曦[1] 徐纪平[1] 

机构地区：[1]中国科学院长春应用化学研究所,130022

出　　处：《水处理技术》1992年第2期84-89,共6页Technology of Water Treatment

基　　金：自然科学基金资助课题

摘　　要：对于采用相转换法制得的微孔膜,凝固浴条件是决定其膜形态结构的重要因素之一。本文讨论了凝固浴组成和凝固浴温度对膜形态结构的影响。铸膜液是聚偏氟乙烯、N,N—二甲基乙酰胺和氯化锂组成的三元体系。膜形态结构通过扫描电子显微镜进行观察。可以看到,随着凝固浴条件的变化,所得膜的形态可以是海绵状结构也可以兼有指状结构和海绵状结构。What condition the coagulation bath is in one of the important fa-ctors which decide the morphology of the microporous membranes obtainedby phase-conversion process.In this paper,the effects of composition andtemperature of the coagulation bath on the morphology of the membraneswere discussed.The casting solution was the ternary system composed ofpoly(vinylidene fluoride),N,N-dimethyl acetamide,and lithium chloride.The morphology of the membranes was examined by scanning electronmicroscopy (SEM).It was observed that the morphology of the obtainedmembranes,which could be sponge-like or both finger-like and sponge-like,depended on the condition of coagulation bath used.

关 键 词：聚偏氟乙烯 微孔膜 凝固浴 膜蒸馏 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]