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Acidity Effect on Proton Conductivity of Hydrocarbon-Based Ionomers

A novel efficient sulfonation of aromatic polymer, which involves the iridium catalyzed C-H activation/borylation followed by the Suzuki coupling, was developed. Using this method three sulfonated moieties with different acidities (fluoroalkyl sulfonic, aryl sulfonic, and alkyl sulfonic acids) could be conveniently incorporated to the aromatic rings of polystyrene. The effect of structure of sulfonic acid group acidity on the proton conductivity was studied, and the results showed that ionomers with superacidic fluoroalkyl sulfonic acid outperformed the less acidic ionomers at low relative humidity.