用聚乙烯醇缩丁醛(PVB)作为本体材料,以N-甲基-2-吡咯烷酮(NMP)为溶剂,以4种不同分子量(分别是2 000,6 000,10 000,20 000)的聚乙二醇(PEG)为添加剂,用浸没沉淀相转化法制备超滤膜.研究了PEG分子量对成膜凝胶动力学和膜性能的影响.利用扫描电镜(SEM)观察PVB膜的形貌,并对膜的性能,包括纯水通量、截留率、孔隙率等进行了研究.结果表明膜上孔的数目和大小都随着PEG分子量的增大而增大.当PEG分子量从2 000增大到20 000时,膜的纯水通量首先由62.8 L/(m2·h)增大到104 L/(m2·h),然后又降到50.1L/(m2·h).另外,随着PEG分子量的增大,膜的耐污染性逐渐变差,而孔隙率逐渐增大.
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