Abstract

The heat capacity of poly(vinyl methyl ether) (PVME)/water mixtures was measured over a wide range of temperatures using the stepscan method. The results showed that water exists in different states in the mixtures. The Cp values of dry PVME and PVME/water mixtures with a low water content were obtained by the stepscan method, and the Cp of bound water in the mixtures was approximated. The results showed that the Cp of bound water in the mixtures with a low water content is higher than that of mixtures with glassy water and ice, and it shows no dependence on water content in the glassy state. Because of the larger conformational contribution to Cp, the heat capacity of water in the mixtures in the liquid state increases with water content. Because there is a weak interaction between PVME and water molecules, the structure of water in mixtures is different from that of glassy water. The Cp value of unfreezable bound water in the mixtures was calculated without considering the effect of polymer content, and the interaction between PVME and water was obtained; these calculations explained the phase separation observed at high temperature. The Cp calculation value (♦) of unfreezable bound water in PVME/water mixtures at low temperature. ◊: the experimental Cp of glassy water;21 □: the Cp of cubic ice.30

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