聚醚酰亚胺中空纤维超滤膜的研究(Ⅰ)膜结构、热性能和机械性能

Study on polyetherimide hollow fiber ultrafiltration membrane(Ⅰ)Membrane structure,thermal and mechanical properties

以聚醚酰亚胺 (PEI)为膜材料 ,聚乙烯吡咯烷酮 (PVP)和聚乙二醇 (PEG)等为添加剂 ,N -甲基吡咯烷酮 (NMP)和二甲基乙酰胺 (DMAc)为溶剂 ,采用干 /湿法纺丝技术制备出聚醚酰亚胺中空纤维膜 ,提高了PEI超滤膜的耐污染性 .通过改变纺丝液中不同的添加剂 (如PEG或PVP) ,PEI中空纤维膜断面可从指状孔转变成海绵状 .此外 ,讨论了聚醚酰亚胺中空纤维的膜结构。

Using polyetherimide(PEI) as a membrane material, polyvinylpyrrolidone(PVP) and poly(ethylene glycol) (PEG 600) as additives, N, N-dimethyl-acetamide (DMAc) and N-metyl-2-pyrrolidone (NMP) as solvents, hydrophilic PEI hollow fiber ultrafiltration membranes were fabricated by dry/wet phase inversion technique. In this way, the antifouling ability of PEI ultrafiltration membrane was increased. It was found that the use of different additives and changes in the compositions in PEI dope solutions resulted in a membrane morphology change from the finger-like structure to the spongy structure. Besides membrane structures, mechanical and thermal properties of the ultrafiltration membranes were discussed.