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Performance of Ultrafiltration Membranes with Different Polyethersulfone Molecular Weights I: Effect of Additives

Authors： Li Liang, Hou Zhengchi﹡, Lu Xiaofeng, Liu Zhongying

Units： Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

KeyWords： polyethyleneglycol; polyvinylpyrrolidone; polyethersulfone; ultrafiltration membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2011,31(6):6-12

Abstract：

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.

Funds：

国家自然科学基金(20776147); 上海科委项目(08231200300)

AuthorIntro：

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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