膜科学与技术

一种两亲性共聚物的合成及其对PVDF膜的改性研究

作者：李妍，周晓吉¹，²，沈舒苏¹，²，杨晶晶¹，²，白仁碧¹，²

单位： 1苏州科技大学分离净化材料与技术研发中心；2江苏高校水处理技术与材料协同创新中心，苏州市科锐路1号，邮编：215009；

关键词：两亲性共聚物合成；新型添加剂；PVDF膜改性；膜亲水和抗污染性能改进

出版年,卷(期):页码： 2016,36(6):70-77

摘要：

本研究使用较为简单的一步自由基聚合法从苯乙烯（St）和甲基丙烯酸（MAA）成功地制备了一种两亲性共聚物：PSxMAAy，并将其作为PVDF膜材料的共混添加剂，通过液体沉淀相转化法制备得到各种改性的PVDF膜。研究表明，这种新型添加剂PSxMAAy不仅和PVDF在一定范围内有好的相容性，而且含较高MAA比例的添加剂（即PS1MAA1相对于PS4MAA1）对PVDF膜的亲水性及抗污染性的提高具有更大的优势。取决于添加剂的比例，改性PVDF膜的亲水性可大大提高（水接触角可从未改性PVDF膜的93.5o下降为改性PVDF膜的62.1o）；对BSA蛋白的抗污染能力显著增强（相比未改性膜BSA的静态吸附量的降低可高达82%）。在对BSA和正十六烷乳液的膜过滤实验中，改性PVDF膜对BSA和正十六烷均表现出较好的截留效果和更强的抗污染性能，相比未改性膜的通量衰减率大大降低而通量恢复率大大提高。

In this study, a new type of amphiphilic copolymer, PSxMAAy, was synthesized through an easily one-step method of the free radical polymerization, and was used as an additive to prepare a series of modified PVDF membranes by blending with PVDF and casting their homogeneous solution through the liquid precipitation phase inversion technique. The results showed that PSxMAAy has a well compatibility with PVDF. And those containing a higher ratio of MAA, PS1MAA1 showed better hydrophilicity and anti-fouling modification effect on modified membranes. Decided by the proportion of additive, the hydrophilic were improved greatly for modified membrane (the water contact angle of the membranes can be reduced from 93.5°for PVDF to 62.1° for modified PVDF membranes). The anti-fouling ability of protein was significantly enhanced.. The static adsorption amount of BSA on the modified membranes can be decreased by 82% as compared with that for the unmodified membrane. For the filtration of BSA solution and hexadecane emulsion, the modified membranes also showed much higher rejection rate, lower flux decay and higher flux recovery after cleaning.

作者简介：李妍（1991-），女，山东省枣庄市，硕士研究生，就读于苏州科技大学，主要从事聚偏氟乙烯膜的改性研究，师承白仁碧教授。*通讯作者，白仁碧，E-mail：ceebairb@live.com，教授，博士生导师，主要从事膜材料及膜技术的研究。

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