膜科学与技术

耐压型聚砜两亲嵌段共聚物超滤膜的制备与表征

作者：陈威，王召根，汪勇

单位：南京工业大学材料化学工程国家重点实验室，南京 210009

关键词：嵌段共聚物；聚砜；超滤膜；海绵状孔；耐压性能

出版年,卷(期):页码： 2018,38(6):27-33

摘要：

聚砜类分离膜广泛应用于超滤过程并作为支撑层用于纳滤膜及反渗透膜的制备，然而由于材料自身的疏水性较强，聚砜膜通常要经过亲水化改性来提升渗透和抗污染性能。以两亲嵌段共聚物聚砜-b-聚乙二醇（PSF-b-PEG）为原料，通过相转化方法可无需后期改性制备具有指状孔结构的自发永久亲水性超滤膜，但指状孔的存在使其耐压性能受到限制，难以用作为纳滤或反渗透膜的支撑层。本文采用PSF-b-PEG为制膜材料，通过调节固含量与非溶剂诱导相分离过程中的溶剂/非溶剂体系，将超滤膜断面的指状孔转变为更为耐压的海绵状孔，同时在膜内保留亲水链段以保证膜的渗透及抗污染性能。研究结果表明，当以N,N-二甲基甲酰胺（DMF）为溶剂，去离子水为凝固浴时，可直接制备出具有海绵状孔结构的PSF-b-PEG超滤膜。在25%的固含量下，膜的纯水渗透性为160 L·m-2·h-1·bar-1，对牛血清白蛋白（BSA）截留率达到90%。压密测试表明，相较于指状孔，海绵状孔超滤膜可完全耐受1 MPa的压力，展示了更优的耐压性能。

Polysulfone membranes are widely used as ultrafiltration membranes and the support layers for composite membranes. However, due to the strong hydrophobicity of the material itself, polysulfone ultrafiltration membranes need some modifications to enhance the penetration and anti-fouling performance. We have prepared permanently hydrophilic ultrafiltration membranes with finger-like pores by using amphiphilic block copolymer polysulfone-block-polyethylene glycol (PSF-b-PEG). In this paper, we try to prepare sponge-like membranes with the same material by changing solvent/nonsolvent system and the concentration of polymer solution. The results showed that when N,N-dimethylformamide (DMF) was used as solvent and deionized water was used as nonsolvent, a PSF-b-PEG ultrafiltration membrane with sponge-like structure could be directly prepared. The pure water permeability of the membrane reached 160 L·m-2·h-1·bar-1 and the rejection of bovine serum albumin (BSA) reached 90% under the concentration of 25%. The pressure-resistance test showed that the membranes with sponge-like structure have superior pressure resistance compared with the finger-like membranes.

第一作者简介：陈威（1993-），男，江苏淮安人，工学硕士，从事膜分离材料的研究与应用。 *通讯作者，E-mail：wangzhaogen@njtech.edu.cn; yongwang@njtech.edu.cn

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