| 초록 |
Sulfonated poly(arylene ether sulfone) copolymer is synthesized via nucleophilic step polymerization of sulfonated 4,4’-dichlorodiphenyl sulfone, 4,4’-dichlorodiphenyl sulfone and various phenolphthalin monomers in the presence of potassium carbonate. The copolymer is blended with various amounts of silica particles, prepared by sol-gel process, to form organic-inorganic composite membranes. The silica paticles are attached to the polymer chain by thermal treatment in the presence of sodium hypophosphite. The silica content in the polymer matrix and the effect of esterification are evaluated as a function of membrane performances under low humidity and high temperature conditions. All composite membranes show better water uptake and proton conductivity than the unmodified membrane. The membranes are tested in a commercial single cell at 80 oC and 120 oC in humidified H2/air. The composite membrane containing 10 % (w/w) silica shows the best performance among the prepared membranes especially under high temperature and low humidity conditions. |
