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The sulfonated cardo poly(aryl ether sulfone) with zwitterionic side groups (PES-DS-70) was electrospun to bead-free nanofibers. The PES-DS-70 nanoporous mat was successfully filled with Nafion solution. Scanning electron microscopy observed that the PES-DS-70/Nafion composite membrane has bilayer morphology and good interfacial compatibility. Compared with the neat PES-DS-70, the PES-DS-70/Nafion bilayer membranes showed improved swelling resistance and proton conductivity. Moreover, methanol crossover of the composite film was suppressed due to incorporation of the PES-DS-70 nanofibers. The tensile strength and Young's modulus for the PES-DS-70/Nafion composite membranes were higher than Nafion117. Therefore, the composite membrane with superior combined properties has potential applications for polymer electrolyte membrane fuel cells.

Electrospun Nanofiber-Based Cardo Poly(aryl ether sulfone) Containing Zwitterionic Side Groups as Novel Proton Exchange Membranes