writer：Hongyan Yao,Kaixiang Shi,Ningning Song,Na Zhang,Pengfei Huo,Shiyang Zhu,Yunhe Zhang,Shaowei Guan
keywords：crosslinking,highly sulfonated co-polyimide
source：期刊
specific source：POLYMER，2016,103,171-179
Issue time：2016年
A novel diamine monomer 3,3''''''''-Bis(2,3,5,6-tetrafluoro-4-vinylphenoxy) biphenyl-4,4''''''''-diamine (TFVBPA) bearing double hydrophobic cross-linkable tetrafluorostyrol side-groups has been successfully synthesized via a nucleophilic substitution reaction. A series of cross-linked highly sulfonated co-polyimide (CSPIy-TFVBPAx) membranes with ion-exchange capacity (IEC) values ranging from 2.27 to 2.44 meq.g(-1) have been prepared from this monomer. The CSPIy-TFVBPAx membranes show excellent comprehensive properties, especially the high proton conductivity (0.135-0.190 S cm(-1) at 80 degrees C), low water uptake (60.9-76.7% at 80 degrees C) and swelling ratio (14.2-19.6% at 80 degrees C). Moreover, the CSPIy-TFVBPAx membranes also exhibit outstanding thermal stability (5% weight loss temperature exceed 320 degrees C) and excellent hydrolytic stability. The results indicate that the CSPIy-TFVBPAx membranes are promising candidates for proton exchange membranes in fuel cell applications.