Construction of Direct Observation System for Water hydrating Polymers and Its Application to Analysis of Phase Transition of Water in Polymer Solids

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Phase transition behavior of water sorbed into various polymers (with low water content) and adhesion of fibroblast to their polymers were examined. The adhesion behaviors did not have a correlation with chemical structure, glass transition temperature, and water content of the polymers. Temperature variable infrared spectroscopy revealed the existence of phase transition of a part of the sorbed water, which was generally assigned as "non-freezing (non-freezable) water" by differential scanning calorimetry. Phase transition observed here were not only crystallization and melting but also condensation, vapor deposition, sublimation, revapor-deposition, and vaporization. These results gave a new insight for water structure in water-polymer systems. However, there was no correlation between the fibroblast adhesion to the polymers and the phase transition behavior of water.