| 초록 |
Poly(ether ether ketone) (PEEK) with the backbone or pendent sulfonic acid group was synthesized to prepare polymer electrolyte membranes for fuel cell. For preparation of this membrane, the precursor possessing the reactive functional group, carboxylic acid, was first synthesized to control the degree of sulfonation and cross-linking. A variety of essential properties for fuel cell membranes such as proton conductivity, water uptake, methanol permeability, and chemical, thermal, and mechanical stability were investigated. The proton conductivity was comparable to Nafion 117 and was unusually not decreased significantly by addition of crosslinker because of the proton conducting group, sulfonic acid, attached in it. Methanol permeability was very low, showing even decreasing behavior with crosslinking densit. Crosslinking reduced water uptake and thus enhanced the dimensional stability of membrane. The resistance to oxidation and hydration was also improved by cross-linking. |
