铸膜液中大分子量PVP含量对PVDF膜的影响  

Intluence of macromolecular PVP composition in casting solution on the formation of PVDF membranes

作　　者：田立[1] 张云[1] 汪朝晖[1] 汪效祖[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：《化工新型材料》2014年第12期185-188,共4页New Chemical Materials

基　　金：江苏省"创新团队计划"资助项目(苏政科[2011]87号);南京工业大学青年教师基金资助(39701007);江苏省科技支撑计划-工业部分(SBE201300563)

摘　　要：通过扩散致相转化法制备聚偏氟乙烯(PVDF)平板膜,讨论聚乙烯吡咯烷酮(PVPk90)添加剂对PVDF膜微观结构及性能的影响。结果表明:随着PVPk90含量的增加,膜表层结构逐渐致密,膜孔径减小并且分布均匀,膜亚层的孔结构由胞腔状向树枝状发展。添加大分子量的PVPk90后,大部分PVPk90留在了膜内,膜表面由疏水性向超亲水性状态改变,膜抗污染性能逐渐增强,并且过滤性能提升,产水浊度稳定,在一定范围内膜通量也大幅度增加。PVDF flat sheet membranes were prepared via diffusion induced phase inversion processThe effect of macromolecular PVP composition in casting solution on the formation of PVDF membranes was investigated.It was found that the pore size of membrane surface became smaller and uniform with increasing macromolecular PVP content in the casting solution.The morphology of sub layer developed from cellular to dendritic structure.After the formation of PVDF membrane,most of the PVPK90 in casting solution retained in the membranes,and resulted in the increase of membrane hydrophilicity and fouling resistance.Meanwhile,filtration performance was improved gradually,and turbidity of permeating water was stable.

关 键 词：PVDF PVPk90 平板膜 相转化 亲水改性 

分 类 号：O632.21[理学—高分子化学]