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Study on the control of PVDF superhydrophobic microporous membrane

Authors： ZHANG Renwei, LIU Sihua, TANG Chao, SHE Jingguo, WU Chunrui, LU Xiaolong

Units： State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： polyvinylidene fluoride; hydrophobic membrane; non-solvent induced phase separation method; pre-evaporation time; non-solvent additive

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2020,40(3):7-13

Abstract：

Improving the hydrophobicity of hydrophobic membrane surface was an effective way to reduce the wetting risk during its application. In order to control the membrane structure conveniently and effectively and improve the hydrophobicity of the membrane, H2O was added to the dope solution as non-solvent additive by non-solvent induced phase separation method. It was hoped that the membrane structure and hydrophobicity can be controlled by adjusting the pre-evaporation time of primary membrane. The results show that with the increase of pre-evaporation time, the viscosity of the dope solution increased, which was conducive to the formation of gelation on the surface of the membrane, thereby creating a uniform super-hydrophobic structure on the membrane surface. When the pre-evaporation time reached 120 s, the water contact angle of the membrane was 151.2 °, the gas permeation flux of the membrane was 40.9 mL/(m2?s?Pa), and the LEP value was 65.3 kPa.

Funds：

国家自然科学面上基金项目（51578376）

AuthorIntro：

第一作者简介：张仁伟（1995-），男，安徽马鞍山人，硕士，从事PVDF疏水膜制备通讯作者，E-mail：wuchunrui@tjpu.edu.cn；13920286131@163.com

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