【摘要】 以聚偏氟乙烯(PVDF)和一种在常温下为固态的水溶性潜溶剂己内酰胺(CPL)为膜材料和稀释剂,基于热致相分离原理,制备了PVDF微孔膜,通过差示扫描量热仪对不同条件下二元共混物的结晶性能进行了分析,利用扫描电镜研究了稀释剂含量对膜微观结构的影响。结果表明,PVDF质量分数小于25%,PVDF/CPL高温溶液体系在降温过程中发生液-液相分离,主要形成了双连续网络孔结构。研究了PVDF浓度对膜水通量、BSA截留率、膜强度等的影响,该研究为用单一水溶性稀释剂制备PVDF微孔膜定了基础。更多还原

【Abstract】 Different proportions of polyvinylidene fluoride(PVDF) porous membranes were prepared by thermally induced phase separation(TIPS) method of PVDF blended with a solid water-soluble caprolactam(CPL).The crystallization properties of the binary system were analyzed by DSC.The effects of polymer solution concentration on the micro-structure of PVDF membrane were observed and studied by SEM.The results indicate that high temperature solution system of PVDF/CPL exhibits liquid-liquid phase separation during the temperature-fall period when the mass fraction of PVDF less than 25%,and the membrane tend to form spongystructure.The effect of polymer concentration on water flux,BSA retention and tensile strength were studied.This studylays a foundation for preparing a porous PVDF membrane with single water soluble diluent.更多还原