凝胶浴组成对聚偏氟乙烯膜结构性能的影响  

Effects of Different Bath Content on Structures and Performances of PVDF Membranes

作　　者：叶茜[1,2] 许美兰[1,2] 廖文超[1,2] 李漂阳[1] 肖金华[1] 

机构地区：[1]厦门理工学院环境工程系,福建厦门361024 [2]厦门市膜技术研发与应用重点实验室,福建厦门361024

出　　处：《厦门理工学院学报》2012年第4期74-78,共5页Journal of Xiamen University of Technology

基　　金：福建省自然科学基金项目(2011J05141);厦门市科技计划项目(3502Z20113034);厦门理工学院高层次人才科技项目(YKJ10032R)

摘　　要：以聚偏氟乙烯为膜材料,二甲基亚砜为溶剂,通过相转化法制备不对称结构的聚偏氟乙烯微孔膜.考察不同凝胶浴组成浓度对膜结构和性能的影响.结果表明,二甲基亚砜容纳非溶剂水的能力非常弱.以二甲基亚砜为溶剂时,所成膜均为指状孔和球晶共存的结构.凝胶浴的组成将影响成膜机理,随着凝胶浴浓度的不断增大,凝胶分相延迟发生,指状孔的尺寸也随之增大,因此成膜孔隙率和水通量都逐渐升高.当凝胶浴为60%DMSO时,所成膜的孔隙率为78%,水通量达到623 L/m2h.Asymmetric poly（vinylidene fluoride）（PVDF） membranes were prepared by immersion precipitation in the H2O/ dimethylsulfoxide（DMSO） / PVDF system.The effects of different bath content on structures and performances of PVDF membranes were investigated.By using DMSO as solvent,the cast membrane exhibited a large number of short finger-like cavities and globules.It was found that the DMSO in the bath hindered the phase-separation kinetics.The size of finger-like cavities increased with the increase of dimethylsulfoxide in the bath.As a result,the porosity and pure water flux of PVDF membranes also increased.With the bath content of 60% DMSO,the porosity of resulting membrane was 78%,and pure water flux was up to 623 L/m2h.

关 键 词：聚偏氟乙烯 膜 二甲基亚砜 凝胶浴组成 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]