| 相分离方式对PVC/PVDF/PMMA共混膜性能的影响 |
| 作者：徐晶晶a 王军a 罗文华b |
| 单位： a 东华大学环境科学与工程学院，上海 201620；b 泰安市岱岳区环保局，泰安 271000 |
| 关键词： PVC/PVDF/PMMA共混膜；扩散诱导相分离(DIPS)；热致相诱导相分离法(TIPS)；添加剂PEG。 |
| 出版年,卷(期):页码： 2011,31(6):25-29 |
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摘要： |
| 文章在PVC/PVDF/PMMA共混比为6:1:3，聚合物质量百分含量为16wt %的条件下，考察了该体系相分离方式随添加剂PEG200、400、600的加入，溶剂二甲基乙酰胺（DMAc）减少而变化的情况。并通过电镜扫描（SEM）、水通量及孔隙率的测试和拉伸试验，探讨了相分离方式（扩散诱导相分离DIPS、热致相分离TIPS、扩散诱导相分离DIPS与热致相分离TIPS相结合）及PEG分子量对PVC/PVDF/PMMA共混膜断面形态结构、水通量、孔隙率、拉伸强度等性能的影响。结果表明，PEG分子量为200、400、600，加入量分别达到15wt%、18wt %、20wt %时，在常温下共混体系的相分离方式将由DIPS变为DIPS与TIPS相结合或单纯的TIPS；通过TIPS得到的PVC/PVDF/PMMA共混膜断面形态结构为海绵状，表面比较粗糙，水通量较DIPS和DIPS与TIPS结合得到的膜稍低，截留率和拉伸强度有一定程度的提高；PEG分子量对TIPS得到的膜的微观结构有明显的影响；由DIPS得到的膜，由致密皮层与指状大孔构成，由DIPS与TIPS相结合得到的膜，除了皮层与指状大孔外，还有海绵状结构。 |
| 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. |
| 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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