相转化法制备聚醚酰亚胺超滤膜

以不同相对分子质量的聚乙二醇（ＰＥＧ）作为添加剂，讨论了聚醚酰亚胺（ＰＥＩ）和ＰＥＧ混合的相行为，对于ωＰＥＩ＝０．２０的Ｎ，Ｎ－二甲基乙酰胺（ＤＭＡＣ）溶液，测定了多种非溶剂的相混合参数，其值的顺序为：乙醇〉甲醇〉乙二醇〉水。以及为凝固介质，制备了ＰＥＩ超滤膜，考察了水通量，牛血清蛋白ＢＳＡ的膜分离性能，此外，结合膜的电镜照片，探讨孙同相对分子质量ＰＥＧ对膜结构的影响。

Study on Polyetherimide Ultrafitration Membranes by Phase Inversion Method

Using polyethylene glycols(PEG) with different relative molecular masses as additives and N,N dimethylacetamide (DMAc) as solvent, the phase behavior of polyetherimide (PEI) and polyethylene glycol was discussed. The mixability parameters of water, methanol, ethanol and ethylene glycol in w =0.02 solids of PEI/DMAc have been measured. The mixability parameters of different nonsolvents have been found to be in the following order: ethanol>methanol>ethylene glycol>water. Using water as coagulant, polyetherimide (PEI) ultrafitration membranes were prepared. The water permeation fluxes and the separation property of the membranes for BSA were investigated. According to Scanning Electron Microscope (SEM), effects of different relative molecular masses of polyethylene glycol (PEG) on membrane structures were analysed.