Abstract
Proton NMR measurements of T 1, T 1π and T 2 in “Nafion” perfluorosulphonate membranes, together with neutron- scattering and dielectric data, show that the aqueous phase in Nafion solidifies at a glass transformation whose temperature T g is 168 K in water-saturated acid membranes. T g is higher for the salt forms. Mo¨ssbauer measurements on Eu 3+ Nafion confirm that the cations are present in an aqueous phase with T g ≈ 220 K.
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