膜科学与技术

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ECTFE membrane fabrication and the controlling of its structure and properties

Authors： ZHOU Yue, LIU Geng, WANG Zhaohui, WANG Xiaozu, CUI Zhaoliang

Units： 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China 2. National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 211816, China

KeyWords： ECTFE; additive; thermally induced phase separation; vacuum membrane distillation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(3):1-6

Abstract：

A porous poly(ethylene-chlorotrifluoroethylene) (ECTFE) membrane was prepared via thermally induced phase separation (TIPS) using an environmentally friendly diluent trioctyl trimellitate (TOTM), isotatic polypropylene (iPP), nano-silica (nano-SiO2), or micron-sized calcium carbonate (CaCO3) as the additive. The effects of different types of additives iPP, nano-SiO2 and CaCO3 on the structure and properties of the membrane were investigated. The result shows that the addition of iPP could promote liquid-liquid phase separation and the membrane formed a cellular structure. The addition of nano-SiO2 and CaCO3 was used as a nucleation agent in phase separation process, making the spherulite structure transfer to honeycomb structure. In addition, the addition of nano-SiO2 could improve the mechanical properties of the ECTFE membrane and could increase the pore size and porosity of ECTFE membrane. The elongation at break of ECTFE membrane increased by 44.2%, and the average pore-size and porosity were 379.7 nm and 66.1%, respectively. In the vacuum membrane distillation (VMD) process, the permeation flux of the membrane with nano-SiO2 increased by 24.26% compared with the original membrane in the same feed conditions, reaching 24.53 L/(m2·h), and the salt rejection rate reached at 99.97%.

Funds：

江苏省人力资源和社会保障厅六大人才高峰（JNHB-036）

AuthorIntro：

周玥（1991，10），女，江苏南通，硕士，助理实验师，主要研究方向为膜分离； E-mail：1406640151@qq.com

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