文献类型：期刊文献

英文题名：Fabrication and characterization of PVDF membranes via an in situ free radical polymerization method

作者：Zhang, Ping-Yun[1];Xu, Zhen-Liang[1];Yang, Hu[1];Wei, Yong-Ming[1];Wu, Wen-Zhi[1]

机构：[1]E China Univ Sci & Technol, Chem Engn Res Ctr, State Key Lab Chem Engn, Membrane Sci & Engn R&D Lab, Shanghai 200237, Peoples R China

年份：2013

卷号：97

起止页码：296

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20132116364563);WOS:【SCI-EXPANDED(收录号:WOS:000320508700027)】；

基金：The authors are thankful for the financial support received from the Key Technology R&D Program of Shanghai Committee of Science and Technology in China (11DZ1205201) and the Key Program of Science and Technology of Guangdong Province in China (2011A080403004) and the National Natural Science Foundation of China (20076009, 21176067 and 21276075).

语种：英文

外文关键词：Membranes; Separations; Polymerization; Solution; Supramolecular aggregates; Mechanical properties

摘要：In situ free radical polymerization was proven to be successful for the preparation of PVDF membranes with superior mechanical behaviors and enhanced antifouling properties. Micro-structure adjustment of PVDF solution via in situ polymerization was investigated by dynamic light scattering (DLS) and scanning electron microscopy (SEM). The DLS and SEM results verified the formation of supramolecular polymer copolymer aggregates. The narrow distribution of the supramolecular aggregates explained the decreasing surface tension, increasing viscosity with trivial strain thinning behavior and accelerating precipitation rate of the PVDF casting solution. The resultant PVDF membranes possessed narrowly distributed pore size and molecular weight cut off (MWCO) of the final filtration properties, which were attributed to the aggregates; additionally, their corresponding mean effective pore size (mu) and MWCO increased with increasing concentration of the monomers via in situ polymerization. Further, in situ polymerization not only enlarged the recovery water flux after filtration experiments with bovine serum albumin (BSA) but also improved the hydrophilicity of both the top-surface and the bottom-surface of the PVDF membranes. Additionally, in situ polymerization modulated the PVDF membrane configurations, varying from stripe-shaped grains to agglomerates of globule (with one of the globules bearing on the surface of another). The tunable morphologies, combined with the progressive enhanced crystallinity of the alpha and beta phase (largely in the beta phase form), were used to interpret the superior mechanical properties of the resulting PVDF membranes. (C) 2013 Elsevier Ltd. All rights reserved.