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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。
A PVDF microporous membrane was prepared by polyvinylpyrrolidone (PVDF) and a water-soluble latent solvent caprolactam (CPL), which is solid at room temperature, as a membrane material and a diluent. Based on the principle of thermal induced phase separation, The calorimeter was used to analyze the crystallinity of the binary blends under different conditions. The influence of the diluent content on the microstructure of the films was investigated by scanning electron microscopy. The results show that the mass fraction of PVDF is less than 25%, and the liquid-liquid phase separation occurs in the PVDF / CPL high-temperature solution system during the cooling process, forming mainly a bicontinuous network pore structure. The effects of PVDF concentration on membrane water flux, BSA rejection, membrane strength and so on were studied. The research laid the foundation for the preparation of PVDF microporous membrane with a single water-soluble diluent.