采用两步法制备聚酰亚胺(PI)纳滤膜,探究了前聚体聚酰胺酸(PAA)分子量对制得PI膜结构与性能的影响.通过调控单体投料比得到不同分子量的前聚体PAA,经亚胺化得到PI膜,最后考察其耐溶剂耐高温性能.结果表明,随PAA分子量增大,PI膜表面由多孔变为致密,通量下降;在一定PAA分子量范围内,对固绿(MW808)的截留率上升,从68.2％增加到93.8％;当PAA分子量进一步增加时截留率保持不变.对制得PI膜进行耐溶剂耐高温测试,发现PI膜在有机溶剂和高温环境中均能保持较好的稳定性,并且随PAA分子量增大,PI膜的化学稳定性和热稳定性增强.由较高PAA分子量制备的PI膜在有机溶剂中对固绿截留率保持在85％以上,高温环境中几乎保持不变.
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