两步接枝聚合法对PVDF中空纤维微孔膜的亲水化改性研究  

STUDY ON HYDROPHILICITY MODIFICATION OF POLY(VINYLIDENE FLUORIDE) HOLLOW FIBER MICROPOROUS MEMBRANES VIA A TWO-STEP GRAFTING POLYMERIZATION

作　　者：林韩韩[1] 李倩[1] 王晓琳[1] 

机构地区：[1]清华大学化学工程系膜材料与工程北京市重点实验室,北京100084

出　　处：《水处理技术》2013年第4期9-14,共6页Technology of Water Treatment

基　　金：国家重点基础研究发展973计划项目(2009CB623401);国家高技术研究发展计划863资助项目(2009AA062901;2012AA03A604);北京市自然科学基金重大项目(2100001)

摘　　要：为了提高PVDF中空纤维膜的抗污染性,本文采用两步表面接枝聚合的方法,利用磺基甜菜碱类两性离子聚合物-聚甲基丙烯酸二甲基丙基磺酸胺乙酯(polyMEDSA)对PVDF中空纤维微孔膜的外表面进行亲水改性。首先由PVDF膜的外表面引发甲基丙烯酸羟乙酯(HEMA)的原子自由基聚合(ATRP)反应,引入羟基活性位点,再利用铈离子(Ce4+)引发MEDSA在膜表面上发生接枝共聚反应,从而得到两性离子改性PVDF中空纤维微孔膜(polyMEDSA-c-polyHEMA-g-PVDF)。结果表明,改性PVDF膜的亲水性明显提高,显示出良好的抗蛋白污染性,且不会影响原膜良好的机械强度。与原PVDF中空纤维膜相比,改性PVDF中空纤维微孔膜(接枝量=225.7μg/cm2)外表面的亲水性提高了33%,蛋白质吸附量减少了45.7%,纯水通量恢复率提高了44%。To improve the anti-fouling performance of PVDF hollow fiber microporous membranes, the sulfobetaine zwitterion polymer, poly [2-（methacryloyloxyethyl）ethyl]-dimethyl- （3-sulfopropyl） ammonium （polyMEDSA）, was grafted from the outside surface of the membrane. Firstly, 2-hydroxyethylmethacrylate （HEMA） polymerwastethered to thesurface of PVDF hollow fiber membrane via atom transfer radical polymerization （ATRP） to provide active hydroxyl sites for the subsequent copolymerization. Then, the initiator cerium ion （Ce （IV）） was applied to generate the copolymeriation of MEDSA on the surface of polyHEMA-g-PVDF membrane and the modified membranes（polyMEDSA-c-polyHEMA-g-PVDF） were finally obtained. The hydrophilicity of the modified PVDF membrane was significantly enhanced and the membrane exhibited an excellentanti-protein-fouling performance. Compared to the nascent PVDF hollow fiber membrane, The hydrophilicity increased by 33% and protein adsorption decreased by 45.7% on the outside surface of the modified membrane with grafting amount of 225.7 μg/cm2, as well as, the relative flux recovery of it increased by 44%.

关 键 词：两步接枝聚合 聚偏氟乙烯中空纤维微孔膜 两性离子 亲水性 抗污染性 

分 类 号：TQ028.8[化学工程]