基于相转化法的成膜条件对聚砜膜结构的影响

采用相转化法制备聚砜超滤膜,分别以甲醛溶液、乙醇溶液、DMAC溶液、蒸馏水以及自来水作为凝固浴,含量均为5%.并在其他因素不变的条件下,控制聚砜膜空气中停留时间,并对聚砜超滤膜的断面结构以及表面结构进行了测试及表征.结果表明,使用水作为凝固浴组成时膜的选择性最好,断面结构分布均匀;空气中停留时间为15秒时选择性较好,指状孔结构分布均匀.

Effects of the deposition conditions based on Phase inversion method on characterization of polysulfone ultrafiltration membrane

Polysulfone ultrafiltration membrane was prepared by the method of Phase inversion. Casting solution consists of methanal、ethyl alcohol、dimethylacetamide（ DMAC） 、distilled water、and main-water as coagulation bath. The concentration of the additive was 5%. When the other factors unchanged,changed the residence time,then the section and the surface structure of polysulfone ultrafiltration membrane were tested and characterized. The results show that when main-water was used as coagulation bath,membrane selectivity was best,cross section structure distribution was uniform; when residence time was 15 seconds,membrane has good selectivity,finger pore structure distribution was uniform.