膜科学与技术

不同分子量聚醚砜超滤膜性能的研究I：不同添加剂的影响

作者：李良，侯铮迟﹡，陆晓峰，刘忠英

单位：中国科学院上海应用物理研究所，上海 201800

关键词：聚乙二醇；聚乙烯吡咯烷酮；聚醚砜；超滤膜

出版年,卷(期):页码： 2011,31(6):6-12

摘要：

本文选用两种分子量的聚醚砜(PES)为膜材料，以N-甲基吡咯烷酮为溶剂，分别以聚乙二醇(PEG400、PEG6000)和聚乙烯吡咯烷酮(PVP K30)为添加剂，用非溶剂致相分离法制备了超滤膜，系统地研究了添加剂种类及浓度对不同分子量PES超滤膜性能的影响，利用相图及铸膜液粘度数据，从热力学、动力学、聚合物聚集体大小角度对实验现象进行了解释。结果表明，同种添加剂时，随PES分子量增大制得超滤膜的过滤通量增大、截留率降低。不同添加剂时，PES超滤膜的介质通量按添加剂为PEG400，PEG6000，PVP K30的顺序依次增大。添加剂为PVP K30、PEG400时PES超滤膜的截留率大于添加剂为PEG6000时PES超滤膜截留率。铸膜液配方相同，添加剂浓度增大时，制得超滤膜的厚度增大，过滤通量增大、截留率降低。

Polyethersulfone(PES) with two kinds of molecular weights were chosen to prepare ultrafiltration membranes by the nonsolvent induced phase separation method using N-methyl-2-pyrrolidone (NMP) as solvent and polyethyleneglycol(PEG400, 6000), polyvinylpyrrolidone K30(PVP K30) as additives in the study. The effects of additive species and concentrations on performance of ultrafiltration membranes with different PES molecular weights were systematically investigated. Based on the ternary phase diagram and cast solution viscosity data, the experimental phenomena were explained from the perspectives of thermodynamics, dynamics and polymer aggregate dimensions. It was found that increasing PES molecular weight would lead to higher permeability and lower rejection with the same additive. Solute fluxes of membranes increase in the order: PEG400<PEG6000<PVP K30. Solute rejections of membranes with PVP K30 and PEG400 were higher than the membrane with PEG6000. With the same cast solution composition, increasing additive concentration would increase the thickness of membranes and lead to higher permeability and lower rejection.

李良(1986- )，女，黑龙江人，硕士研究生，主要研究方向为膜科学与技术，E-mail: liliang@sinap.ac.cn﹡通讯联系人：houzhengchi@sinap.ac.cn

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