| 초록 |
A series of sulfonated polyimide (SPI) with cross-linkable functional group in the main chain were prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride and 4,4’-diaminochalcone for proton exchange membranes of direct methanol fuel cell (DMFC). The photo-induced chemical crosslinking of the polyimide was carried out by using 1,6-hexanedithiol (HDT) and IRGACURE 907® as a photo-initiator. The physical and conductive properties of crosslinked membranes were investigated. Compared with non-crosslinked SPI membranes, the crosslinked SPI membranes exhibited improvement in dimensional stability, thermal stability, and mechanical property as well as hydrolytic and oxidative stabilities. Photo-induced chemical crosslinking also greatly reduced water uptake and methanol crossover with only slight sacrifice in proton conductivities. The crosslinked SPI membranes were particularly promising as proton exchange membranes for direct methanol fuel cell (DMFC) applications. |
