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Study on Hydrophilic Modification of Polyvinylidene Fluoride-Trifluorochloroethylene Membrane
Authors： SUN Yuke, Lyu Xiaolong, KONG Xiao, ZHENG Shuyun, ZHANG Shaozhe, MA Ronghua
Units： State Key Laboratory of Separation Membrane and Membrane Process, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
KeyWords： Polyvinylidene fluoride-trifluorochloroethylene;Membrane fouling; graft reaction; hydrophilic modification
ClassificationCode：
year,volume(issue):pagination： 2020, 40(5):47-53

Abstract：

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.

Funds：
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）

AuthorIntro：
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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