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聚偏氟乙烯-三氟氯乙烯膜亲水化改性方法探究

作者：孙煜珂，吕晓龙，孔晓，郑书云，张绍哲，马荣花

单位：省部共建分离膜与膜过程国家重点实验室，材料科学与工程学院，天津工业大学，天津 300387

关键词：聚偏氟乙烯-三氟氯乙烯；膜污染；接枝反应；亲水化改性

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分类号：

出版年,卷(期):页码： 2020,40(5):47-53

摘要：

本文利用聚偏氟乙烯-三氟氯乙烯（PVDF-CTFE）独有的C-Cl键作为反应活性位点，在配制铸膜液的过程中加入多羟基亲水性物质葡甲胺，PVDF-CTFE在溶解的同时与葡甲胺发生接枝反应，从而基于原位取代反应一步法制备了持久亲水的聚偏氟乙烯-三氟氯乙烯膜。在本文中，我们重点对比了一步法本体改性制备的改性PVDF-CTFE膜与表面接枝改性以及表面交联改性的PVDF-CTFE膜，考察了这三种方式改性后PVDF-CTFE膜的亲水性、拉伸强度、孔径变化和抗污染性能等，结果表明，一步法对共聚物膜的亲水化改性效果（水接触角下降66.2°）以及膜抗污染性能提升效果显著高于其余两种方式，并且在保持膜的孔径和拉伸强度不受影响的前提下显著地提升了膜的纯水通量（最高提升了185%）。

In this paper, the unique C-Cl bond of Poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (PVDF-CTFE) is used as the reactive site, and the polyhydroxyl hydrophilic substance meglumine, PVDF is added in the process of preparing the casting solution. -CTFE undergoes a grafting reaction with meglumine while dissolving, and a durable hydrophilic polyvinylidene fluoride-trifluorochloroethylene membrane is prepared an one-step substitution reaction which is based on in situ. In this paper, we focused on comparing the modified PVDF-CTFE membrane prepared by one-step bulk modification with surface graft modification and surface cross-linking modified PVDF-CTFE membrane. We examined the hydrophilicity, mechanical properties, pore size change, and antifouling performance of PVDF-CTFE that modified by these three methods. The results show that the one-step method has a hydrophilic modification effect on the copolymer membrane (water contact angle decreased by 66.2 °) and a significant improvement in the antifouling performance of the membrane, it is higher than the other two methods, and significantly improves the pure water flux of the membrane (with a maximum increase of 185%) while maintaining the membrane's pore size and mechanical properties.

基金项目：

国家自然科学基金（21776216），国家重点研究发展计划（2017YFC0403902），山东省自然科学基金（ZR2019LFG007），天津市高等学校创新研究计划（TD13-5044）

作者简介：

孙煜珂（1995-），女，浙江桐乡人，硕士研究生，研究方向为膜制备，E-mail：18367386528@163.com

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