| 초록 |
PEMFCs are considered as the most promising power source for automotive transportation in order to preserve oil resources and reduce significantly greenhouse gas emission. Sulfonated polyimides (SPIs) have been designed to be used as proton conducting membranes in fuel cells. A series of SPIs containing were synthesized by two-step polymerization method. SPI copolymers were prepared by the reaction of 4,4'-diaminodiphenyl ether-2,2'-disulfonic acid(ODADS), Bis(3-aminophenyl) sulfone and 3,3',4,4'-Biphenyl tetracarboxylic dianhydride(BPDA) in 1-methyl-2-pyrrolidinone (NMP). The sulfonated monomer in the SPIs was varied from 0 to 70 wt %. The molecular structures of the SPIs were analyzed by means of fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis(TGA) and Differential scanning calorimetry(DSC). In addition, Ion exchange capacity(IEC) and water uptake(W.U) indicated high proton conductivity and excellent dimensional stability. |
