膜科学与技术

低临界共溶温度PSF-DMAc-PEG体系微孔膜及其性能表征

作者：许振良，蒋福四，魏永明，刘敏

单位：华东理工大学化学工程联合国家重点实验室，化学工程研究所膜科学与工程研发中心，上海200237

关键词：聚砜；微孔膜；热致相分离；低临界共溶温度

出版年,卷(期):页码： 2013,33(3):5-11

摘要：

本文讨论了聚砜（PSF）-N,N-二甲基乙酰胺（DMAc）-聚乙二醇（PEG200、PEG400 和PEG600）低临界共溶温度（LCST）体系；通过理论和实验验证了其LCST体系的存在，利用LCST的热致相分离（LCST-TIPS-Reverse thermally induced phase separation，简称RTIPS）法制备了PSF微孔膜，讨论了凝胶浴温度、制膜方法、铸膜液组成对PSF微孔膜的结构及性能影响。通过RTIPS机理所成膜综合力学性能优于非溶剂致相分离（NIPS）法所制备的膜，当PEG400:DMAc质量比1.1:1，成膜水浴温度60℃时，膜渗透性能和机械性能较好，其膜通量670 L•m-2•h-1•bar-1，平均孔径0.060μm，断裂强度5.62MPa。

Polysulfone (PSF) - N, N-Dimethyl Acetamide (DMAc) -polyethylene Glycol (PEG200, PEG400 and PEG600) systems with low critical solution temperatures (LCST) were discussed. PSF-DMAc-PEG systems with LCST were confirmed by theory and experiments. PSF microporous membranes were fabricated by thermally induced phase separation with lower critical solution temperature (LCST-TIPS-Reverse thermally induced phase separation, RTIPS). The effects of coagulation bath temperatures, membrane preparing methods and compositions of casting solutions on morphologies and performances of PSF microporous membranes were discussed. Comprehensive mechanical properties of the membrane prepared by the mechanism of RTIPS were better than that by nonsolvent induced phase separation (NIPS). When the mass ratio of PEG400/DMAc was 1.1and coagulation bath temperature was 60℃, the membrane permeability and mechanical property was better as follows: the membrane flux was 670 L•m-2•h-1•bar-1, the average pore size was 0.060μm and the break strength was 5.62MPa.

许振良(1962 ~)，男，江苏江阴市人，教授、博导，主要研究膜科学与工程、分离科学与工程、污水治理工程等。

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