| 초록 |
High temperature and high strength thermoplastics have excellent mechanical and thermal stabilities and their sulfonated analogs are frequently used as proton conducting membrane materials. Sulfonated poly(ether ether ketone) (sPEEK) or sulfonated poly(phenylene oxide) (sPPO) is one of the examples, and a highly sulfonated membrane shows good proton conductivity, but poor methanol permeability for its commercial application for direct methanol fuel cell (DMFC). To decrease high methanol permeability, sPEEK or sPPO was crosslinked through sulfonic acid. The in-situ crosslinking of sulfonic acid was performed by addition of 1,1'-carbonyldiimidazole (CDI) and diamines as crosslinking agents. The formation of sulfonamide linkages was confirmed by ATR-FTIR and UV-vis spectroscopy. As the content of crosslinker increases, IEC and water uptake decreased. |
