Proton Transport Through Polyethylene‐Tetrafluoroethylene‐Copolymer‐Based Membrane Containing Sulfonic Acid Group Prepared by RIGP

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Abstract
A novel sulfonic acid group containing membrane (SH membrane) was prepared by grafting glycidyl methacrylate onto an ethylene‐tetrafluoroethylene copolymer film with subsequent sulfonation. The graft chains introduced on the SH membrane form a flexible brush‐type structure capable of binding water molecules (30% more than Nafion 117 membrane) and transporting protons. Proton conductivity of the SH membrane was evaluated as a function of group density. The SH membrane with the group conversion of 97% and the thickness of 70 μm had a specific resistivity of 24 Ω cm at 303 K, which was comparable to that of Nafion 117 membrane. A uniform distribution of the group across the SH membrane was verified using an electron probe x‐ray microanalyzer.

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