Abstract
Freezing and nonfreezing water contents in perfluorosulfonated membranes and sulfonated hydrocarbon membranes were estimated using differential scanning calorimetry. In the sulfonated hydrocarbon membranes the amount of freezing water decreased with the increase of divinylbenzene content and with the decrease of water content. When the molalities of fixed charges in sulfonated hydrocarbon membranes and perfluorosulfonated membranes were similar to each other, the free water content in the perfluorosulfonated membranes was larger than that in the sulfonated hydrocarbon membranes. The number of moles of nonfreezing water per mole of fixed charges in the perfluorosulfonated membranes was smaller than that in the sulfonated hydrocarbon membranes.
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