采用浸没沉淀相转化法制备聚偏氟乙烯(PVDF)平板膜,考察亲水性添加剂聚乙烯吡咯烷酮(PVP)的分子量对膜微结构及性能的影响.结果表明,以PVP 58000、PVP 230000为添加剂所制得的膜的纯水通量明显高于以PVP 10000、PVP 780000为添加剂的膜,且膜内部的大孔结构得到充分发展.同时,对膜的亲水性及抗污染性能进行测试,结果发现,高相对分子质量的PVP由于部分残留在膜内从而有效地改善了膜表面的亲水性,其中PVP 230000作添加剂时膜的抗污染能力最强,对质量分数为1 000×10-6的BSA水溶液的稳定渗透率达120 L/(m2· h·0.1 MPa)左右.%PVDF membranes were prepared via phase inversion process from casting solution composed of polyvinylidene fluoride ( PVDF), dimethylacetamide ( DMAc), and polyvinylpyrrolidone ( PVP) of different molecular weights. The effect of PVP molecular weights on morphology and performance was investigated. It was found that with increase in PVP molecular weight the water flux rised firstly, and then decreased. When PVP 58000 and PVP 230000 were used as additives, the water flux was much higher than PVP 10000 and PVP 780000, and macrovoids existed. The hydrophilicity of the membranes was also examined. It was found that PVP with high molecular weight was partially entrapped in the pores. It was proved that the entrapped PVP was proven to enhance the hydrophilicity of the membranes. The anti-fouling performance of membranes with PVP 230000 as additive was best, and the steady permeability of bovine serum albumin (BSA) solution reached 120 L/(m2 · h · 0. 1 MPa) approximately.
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