聚偏氟乙烯微孔膜一步法亲水化改性研究  

Hydrophilic modification of PVDF micropoprous membrane with high-energy irradiation via one-step method

作　　者：左丹英[1] 刘富[1] 朱宝库[1] 徐又一[1] 

机构地区：[1]浙江大学高分子科学研究所,杭州310027

出　　处：《膜科学与技术》2006年第3期41-45,50,共6页Membrane Science and Technology

基　　金：国家"973"计划资助项目(2003CB615705)

摘　　要：采用高能电子束预辐照接枝的方法,研究了液相丙烯酸(AAc)和苯乙烯磺酸钠(SSS)双元混合体系对聚偏氟乙烯(PVDF)微孔膜的接枝改性,用一步法直接制备了含有羧酸基团和磺酸基团的强亲水性PVDF微孔膜.考察了辐照剂量、反应时间、反应温度、单体浓度、单体配比以及反应溶液pH值等对接枝率的影响.采用FT-IR、接触角和水通量表征改性前后的膜表面性质和膜性能.结果表明,接枝改性后膜的亲水性增强,接触角随接枝率的增加而降低,水通量随接枝率的增加呈现出先升后降的变化,这主要是由于高接枝率时膜表面和膜孔被接枝链堵塞.Acrylic acid and sodium styrene sulfonate were grafted onto PVDF composite membrane by high - energy electron beam pre - irradiation. A kind of hydrophilic PVDF membrane with - COOH and - SO3H was prepared by one- step method. The effect of irradiation dose, grafting time, grafting temperature, monomer concentration, monomer ratio and pH of solution on the grafting yield were investigated. The surface chemical composition and performance of modified membranes were characterized by FT- IR, flux water, and the contact angle. The results show that the hydrophilicity of modified membrane was improved. The contact angle decrease with the grafting yield increase, whereas the water flux reached a maximum with the grafting increasing. For the low grafting the water flux increased with the grafting yield increase, and for high grafting yield the water flux reduced as a result of jammed membrane pore.

关 键 词：高能电子束 预辐照接枝 聚偏氟乙烯 亲水化改性 微孔膜 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]