Abstract
A new sulfonated poly (aryl ether ketone sulfone) consisting of rigid fluorene groups (SPAEKS) is synthesized from 3, 3′-disulfonate-4, 4′-dichlorodiphenylsulfone, and 9, 9-bis (4-hydroxyphenyl) fluorene by a typical condensation polymerization. The chemical structure of SPAEKS is characterized by 1H-NMR and FTIR spectra. SPAEKS-x membranes have moderate water absorption, swelling rate, good oxidative stability, and excellent thermal stability. The proton conductivity of SPAEKS-x membranes is in the range of 38.5–66.5 mS/cm. In particular, the proton conductivity of SPAEKS-50 membrane is 66.5 mS/cm, which is slightly higher than Nafion117 membrane (63.5 mS/cm) measured under the same conditions. All membranes show much lower methanol permeability and much higher proton selectivity than Nafion 117 membrane. Especially, proton selectivity of SPAEKS-40 membrane (13.8 × 104 S s cm−3) is about 4 times higher than that of Nafion 117 membrane (3.6 × 104 S s cm−3).
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