以AIBN为引发剂,采用本体聚合的方法制备了聚甲基丙烯酸N,N-二甲氨基乙酯(PDMAEMA),并采用中空纤维超滤膜技术滤除PDMAEMA水溶液中的低聚物和未反应的单体.以聚砜(PSf)超滤膜为基膜,以所精制的PDMAEMA为水相涂层液,以对二氯苄的正庚烷溶液为有机交联剂,利用界面聚合的方法制备了PDMAEMA/PSf荷正电复合纳滤膜.实验重点研究了PSf基膜和单体浓度、水相pH值及浸涂时间、水相沥干时间、交联反应时间等条件对所制备纳滤膜分离性能的影响,确定了较优的制膜条件.所制备的荷正电纳滤膜对1 g/LMgSO4水溶液(0.8MPa,30℃)的截留率为86.7%,水通量为8.4 L/(m2·h).
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