添加剂PVP分子量对PVDF平板膜微结构及性能的影响  

Effect of PVP molecular weights on structures and properties of PVDF membranes

作　　者：张益慧[1] 查富芳[1] 范益群[1] 

机构地区：[1]南京工业大学化学化工学院材料化学工程国家重点实验室,南京210009

出　　处：《膜科学与技术》2013年第1期6-11,共6页Membrane Science and Technology

基　　金：国家重点基础研究发展计划项目(2009CB623406);海外高层次人才引进计划;江苏高校优势学科建设工程资助项目

摘　　要：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120L/(m2.h.0.1MPa)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.

关 键 词：PVDF PVP分子量 相转化 亲水改性 

分 类 号：TQ028.8[化学工程]