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Effect of different phase separation mechanisms on performance of PVC/PVDF/PMMA blend membrane
Authors：  Xu Jingjinga  Wang Juna  Luo Wenhuab
Units： 1.College of Environmental Science and Engineering,Donghua University,Shanghai 201620, China; 2.Tai’an Daiyue Area Environmental Protection Bureau, Tai’an 271000, China
KeyWords： PVC/PVDF/PMMA blending membrane; Diffusion induced phase separation; Thermally induced phase induced phase separation; additives PEG
ClassificationCode：TQ325.3
year,volume(issue):pagination： 2011, 31(6):25-29

Abstract：

 In this article, it was found that the phase separation mechanisms of PVC/PVDF/PMMA blending system varied with the increase of additive( polyethylene glycol (PEG) of three different molecular weights (200 Da,400 Da and 600 Da, respectively)) and decrease of solvent dimethylacetylamide(DMAC).Based on the condition of the effects of phase separation mechanisms(DIPS,TIPS, or combination of DIPS and TIPS) and molecular weights of PEG on the membrane performances of cross section structure, water flux, porosity and mechanical strength were discussed by scanning electrometry microscopy (SEM), water flux test, porosity test and tensile test under the condition of PVC/PVDF/PMMA blending ratio of 6:1:3 and weight percentage of polymer of 16wt %. The results showed that the phase separation mechanism varied from DIPS to TIPS or both DIPS and TIPS under the normal temperature when the weight percentage of PEG200, PEG(400) and PEG(600) was 15wt %、18wt % and 20wt %, respectively. Comparing the blending membranes prepared by TIPS with that by combination of DIPS and TIPS, the cross section is spongy and the surface is rough, in addition, the water flux and tensile strength increased and the rejection decreased. The effect of molecular weights of PEG on microstructure of membranes by TIPS is obvious. The membrane prepared by DIPS is consisting of a dense top layer and a sub layer with finger-like cavities. But the membranes prepared by combination of DIPS and TIPS have the spongy structure, besides.

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AuthorIntro：
徐晶晶（1986-），女，河南省开封市人，硕士，研究方向：膜分离技术。 Email：xjj_331@mail.dhu.edu.cn.联系人：王军。通讯地址：上海市松江区人民北路2999号东华大学环境学院

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