T. Kobayashi et al., PROTON-CONDUCTING POLYMERS DERIVED FROM POLY(ETHER-ETHERKETONE) AND POLY(4-PHENOXYBENZOYL-1,4-PHENYLENE), Solid state ionics, 106(3-4), 1998, pp. 219-225
henylene-oxy-1,4-phenylene-carbonyl-1,4-phenylene) (PEEK) and poly(4-p
henoxybenzoyl-1,4-phenylene, Poly-X 2000) (PPBP), were sulfonated with
sulfuric acid by incorporating sulfonic acid moieties in order to con
vert these polymers to proton-conducting polymers. The sulfonated poly
mers containing 65 mol% sulfonic acid showed a high proton-conductivit
y of 10(-2)-10(-4) S cm(-1) at room temperature. Sulfonated PPBP showe
d a much higher and more stable proton conductivity than sulfonated PE
EK, which is in agreement with the strong water absorption of the form
er compound.