Abstract
Water sorption by poly(ethylene-co-methacrylic acid)-based ionomers is investigated. It is revealed that water molecules are absorbed preferentially at the COONa ion pairs in both the amorphous and ionic cluster regions, and that three water molecules per one sodium ion form the primary hydration shell. In the more hydrated samples, the excess water molecules are found to local just around the primary hydration shell. It was found by DSC that both the transition temperature and enthalpy change for the transition near 330 K decrease with increasing hydration. However, this transition was observed even in the fully hydrated samples
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