Abstract
Sulfonated poly(phthalazinone ether ketone)s with different sulfonation degrees were directly polymerized via N−C coupling reaction. The resulting polymers with inherent viscosity ranging from 0.97 to 1.29 dL/g were characterized by 1H NMR and elemental analysis. Membranes were obtained by casting 5% solution in DMAc (N,N‘-dimethylacetamide) of the polymers at 60 °C. Because of their specially designed structure, the membranes of the polymer have excellent thermal and oxidative stability. TGA curves showed that the loss of sulfonic groups occurred at around 300 °C. The membranes demonstrated excellent acidic stability; their forms could be maintained for at least 47 h when subjected to Fenton's reagent (30 ppm FeSO4 in 30% H2O2) at 25 °C. For the polymer with a sulfonation degree of 2, the highest water uptake of 46% at 80 °C and the best proton conductivity of 1.77 × 10-2 S/cm at 95 °C 100% relative humidity were obtained, and a low Ea of 5.6 kJ/mol was calculated.
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