Abstract
Surface characteristics of perfluorinated cation-exchange resins (Nafion) were investigated by the measurement of heats of immersion in 1-nitropropane, hexane and water. Electrostatic field strengths (F) calculated from the heats of immersion increased with increasing ratios of the exchanged multivalent cation (La3+) in the univalent form (H+) cation-exchange resin, but the values of F were far smaller than those of usual hydrocarbon-based cationexchange resins (Amberlyst-15). This result suggests that the surfaces of the Nafion are far hydrophobic and states of the exchange sites are different as compared with those of the Amberlyst-15.
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