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通过溶解度参数预测,膜渗透性能检测,及扫描电镜(SEM)对膜形貌观察,考察了聚偏氟乙烯(PVDF)在γ-丁内酯(γ-BL)、磷酸三乙酯(TEP)为混合溶剂,乙二醇(EG)、N,N-二甲基乙酰胺(DMAc)及其混合物为凝固浴时,相转化条件及溶剂配比对PVDF膜在孔隙率、纯水通量、BSA截留率,以及拉伸强度等性能方面的影响行为。结果表明,随混合溶剂中TEP质量分数的增加,凝胶浴中溶剂DMAc质量分数增大,PVDF膜皮层逐渐变薄,PVDF结晶球粒粒径变小,孔隙率增加,拉伸强度下降。当混合溶剂中TEP的质量分数为60%,凝胶浴DMAc含量30%时,膜纯水通量达2 100 L/(m2·h),BSA截留率仍保持58.7%,具有良好的超滤性能,可作为制备高通量、较高截留PVDF超滤膜的最佳条件。
The effects of polyvinylidene fluoride (PVDF) on γ-butyrolactone (γ-BL), triethyl phosphate (TEP) The effects of phase transition conditions and solvent ratio on the mechanical properties of PVDF membrane were investigated in terms of porosity, pure water flux, BSA rejection, and tensile properties such as performance impact behavior. The results showed that with the increase of TEP content in the mixed solvent, the mass fraction of DMAc in the gel bath increased and the PVDF film skin became thinner. The particle size of the PVDF crystal pellets became smaller, the porosity increased and the tensile strength decreased. When the mass fraction of TEP in the mixed solvent was 60% and the DMAc content in the gel bath was 30%, the membrane pure water flux reached 2 100 L / (m2 · h), and the rejection of BSA remained at 58.7% with good ultrafiltration Performance, can be used as the preparation of high-throughput, high rejection PVDF membrane best conditions.