A series of novel crosslinkecl sulfonated poly(arylene ether ketone sulfone)polymers containing amino and carboxyl groups (Am-C-SPAEKS) were prepared by nucleophilic polycondensation reactions. The amino and carboxyl groups were introduced into the same polymer chains. The polymers were characterized by FT-IR and H-1 NMR spectroscopy. TEM images of the polymers showed the formation of a continuous proton transport channel after the crosslinking. The proton conductivity of Am-C-SPAEKS was 0.088 S cm(-1), as high as that of Nation under the same conditions. Interestingly, the amount of proton transport channels increased with increasing degree of crosslinking. However, the methanol permeability of Am-C-SPAEKS-30 membrane was 1.56 x 10(-7) cm(2) s at 25 degrees C, one order of magnitude lower than that of Nafion (R) 117 membrane. (C) 2015 Elsevier B.V. All rights reserved.