在PVC/PVDF/PMMA共混比为6∶1∶3,聚合物质量分数为16％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15％,18％,20％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.
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