38. Highly sulfonated co-polyimides containing hydrophobic cross-linked networks as proton exchange membranes
作者：Hongyan Yao, Ningning Song, Kaixiang Shi, Sinan Feng, Shiyang Zhu, Yunhe Zhang, Shaowei Guan
關鍵字：crosslinking,highly sulfonated co-polyimide,proton exchange membrane
論文來源：期刊
具體來源：POLYMER CHEMISTRY,2016,7,4728-4735
發表時間：2016年
A novel diamine monomer bearing double hydrophobic cross-linkable tetrafluorostyrol side-groups has been successfully synthesized. Based on this monomer along with 4,4''''''''-diaminodiphenyl ether-2,2''''''''-disulfonic acid (ODADS) and 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), a series of crosslinked highly sulfonated co-polyimide (CSPIy-6FATFVPx) membranes with IEC values ranging from 2.07 to 2.41 meq g(-1) were prepared via a high temperature poly-condensation, followed by a thermal cross-linking reaction. The SPI were synthesized by high temperature polymerization. The CSPI membranes were obtained from the SPI membrane by thermal crosslinking reation. The polymerization and crosslinking reation were not performed in one pot. The CSPIy-6FATFVPx membranes showed significantly excellent performance, especially the high proton conductivity (0.153-0.210 S cm(-1) at 80 degrees C), low water uptake (54.1%-87.1% at 80 degrees C) and swelling ratio (15.5%-23.0% at 80 degrees C). Furthermore, the CSPIy-6FATFVPx membranes also exhibited outstanding thermal stability (5% weight loss when the temperature exceed 320 degrees C), excellent hydrolytic stability and mechanical properties. The results indicate that CSPIy-6FATFVPx are promising candidates as proton exchange membranes in fuel cell technology.