| 초록 |
Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) has thermal stability (Tg of 210℃) and mechanical durability, and its sulfonated material (sPPO) is often used as a proton exchange membrane. But sPPO with high degree of sulfonation (DS) has poor mechanical properties and increased methanol permeability. To increase mechanical properties and to decrease methanol permeability, sPPO were blended with sulfonated poly(styrene) (sPS) copolymer containing thermal or light crosslinkable sites. sPPO were prepared using chlorosulfonic acid or trimethylsilyl chlorosulfate as the sulfonation agent. sPS were prepared by free radical polymerization of styrene, sodium styrenesulfonate, and a precursor monomer. Then the precursor groups were converted to crosslinkable group. Properties of sPPO/sPS blend membranes were investigated in terms of proton conductivity, methanol permeability, and water uptake. |
