| 초록 |
Perfluorosulfonic acid membranes with the trade name Nafion are the most commonly used electrolyte in proton exchange membrane, because of their high proton conductivity and chemical stability. Despite the many advantages, the Nafion is not satisfactory in many aspects; fuel crossover through the membrane in a direct methanol fuel cell. In this research, we modified some sulfonic acid group of the Nafion into alkyne or azide in order to crosslink the Nafion with another polymer which contains functional groups for click reaction. Using Perfluorooctanesulfonyl fluoride as a model compound, we studied substitution reaction and confirmed the stability of sulfonamide bond of the modified perfluorosulfonic acid. Similar to the model reaction, Nafion was modified for click reaction. Obtained materials were characterized by H-NMR, FTIR, IEC, water uptake, proton conductivity, etc. |
