Plasma graft-polymerization for synthesis of highly stable hydroxide exchange membrane

详细信息    查看全文

• 作者：Jue Hu ; Chengxu Zhang ; Lin Jiang ; Shidong Fang ; Xiaodong Zhang ; Xiangke Wang ; Yuedong Meng
• 关键词：Plasma graft-polymerization ; Hydroxide exchange membrane ; Chemical stability ; Benzyltrimethylammonium group ; Cardo polyetherketone powder
• 刊名：Journal of Power Sources
• 出版年：15 February, 2014
• 年：2014
• 卷：248
• 期：Complete
• 页码：831-838
• 全文大小：1727 K

文摘

A novel plasma graft-polymerization approach is adopted to prepare hydroxide exchange membranes (HEMs) using cardo polyetherketone powders (PEK-C) and vinylbenzyl chloride. The benzylic chloromethyl groups can be successfully introduced into the PEK-C polymer matrix via plasma graft-polymerization. This approach enables a well preservation in the structure of functional groups and formation of a highly cross-linked structure in the membrane, leading to an improvement on the stability and performance of HEMs. The chemical stabilities, including alkaline and oxidative stability, are evaluated under severe conditions by measuring hydroxide conductivity and weight changes during aging. The obtained PGP-NOH membrane retains 86% of the initial hydroxide conductivity in 6 mol L^鈭? KOH solution at 60 掳C for 120 h, and 94% of the initial weight in 3 wt% H₂O₂ solution at 60 掳C for 262 h. The PGP-NOH membrane also possesses excellent thermal stability (safely used below 120 掳C), alcohol resistance (ethanol permeability of 6.6 脳 10^-11 m² s^-1 and diffusion coefficient of 3.7 脳 10^-13 m² s^-1), and an acceptable hydroxide conductivity (8.3 mS cm^-1 at 20 掳C in deionized water), suggesting a good candidate of PGP-NOH membrane for HEMFC applications.