Surface modification of PVDF microporous membrane via a novel “green process
The surface modification of microporous polyvinylidenedifluoride (PVDF) membrane was successfully conducted via room temperature atom transfer radical polymerization (ATRP) in aqueous media. Three typical aqueous methacrylate monomers, 2-(N,N-dimethylamino) ethyl methacrylate (DMAEMA), 2-oligo(ethylene glycol) monomethyl ether methacrylate (OEGMA) and 2-hydroxyethyl methacrylate (HEMA) were grafted directly on the PVDF membrane surface. The improved ATRP technique, i.e. activators generated by electron transfer ATRP (AGET ATRP) process, was used to initiate the polymerization for the improvement of its resistance to oxygen and impurities. Ascorbic acid (AscA) was used as reducing agent to reduce the air-stable Cu(Ⅱ) complex, CuCl2/N,N,N’,N,N-pentamethyldiethylenediamine (PMDETA), resulting in generation of an active catalyst. The membrane surface was characterized by FTIR, XPS, SEM and contact angle. Successful graft of PDMAEMA, POEGMA and PHEMA on the membrane surface was demonstrated by new signals attributed to the corresponding grafted monomers. With the polymerization time as an independent variable for graft polymerization of OEGMA on PVDF membrane, the roughness of the membrane surface had a trend to decrease and then increase, and the contact angle of the membrane surface had a quick drop in 0.5h and came to a constant of 62° after 1.5 h.
MENG Jianqiang CHEN Chunlin NI Lei ZHANG Yufeng
Key Lab of Hollow Fiber Membrane Material and Membrane Process, Tianjin Polytechnic University,Tianj Key Lab of Hollow Fiber Membrane Material and Membrane Process, Tianjin Polytechnic University, Tian
国际会议
2009 International Conference on Advanced Fibers and Polymer Materials(2009年先进纤维与聚合物材料国际学术会议)
上海
英文
641-644
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）