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以聚偏氟乙烯(PVDF)/N,N二甲基乙酰胺(DMAc)/正辛醇/水为制膜体系,采用粗糙基底辅助相转化法制备PVDF疏水性多孔膜。考察了水蒸汽诱导时间对膜结构、表面浸润性和透过性能的影响。结果表明,水蒸汽诱导时间延长,膜表面孔数量增多,孔径增大,膜底面的菜花状球晶粗化愈加充分,表面侧的海绵状网络孔逐渐疏松,当时间延至8min,膜底面球晶变得致密,晶核直径增大,表面侧海绵状网络孔结构中有滴状大孔出现;膜底面的疏水性随水蒸汽诱导时间先增大后明显降低,而气通量则在较短时间内增大明显,后略有下降;实验范围内较适宜的水蒸汽诱导时间为4~5min。
PVDF / N, N-dimethylacetamide (DMAc) / n-octanol / water was used as the film-forming system to prepare PVDF hydrophobic porous membrane by rough substrate assisted phase inversion method. The effects of water vapor-induced time on membrane structure, surface wettability and permeability were investigated. The results showed that the water vapor induced time prolonged, the number of surface pores increased, pore size increased, the bottom surface of the cauliflower-like spherulites coarsening more fully, the sponge-like network surface pores gradually loose, when the time is extended to 8min, Became denser and the diameter of nucleus increased. There was a drop-shaped macropore in the pore structure of sponge network on the surface side. Hydrophobicity of the bottom surface of the membrane first increased and then decreased significantly with the time of water vapor induction, but the gas flux was shorter The time increases obviously, and then decreases slightly; the suitable water vapor induction time is 4 ~ 5min within the experimental range.