反復冷解凍処理による[PVA-PAA]ゲルの構造について

概要

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In order to clarify the structure of[PVA-PAA]gels, the infrared spectra and differential scanning calorimetric data of the gels during the freezing-thawing cyclic process were obtained and the results of tensile properties and contractility by electric potential were discussed. The results obtained are summarized as follows: (1)During the freezing process, cross-linking occurred and the[PVA-PAA]aqueous solution was gelled. This is considered due to the increased of intermolecular hydrogen bonding in PVA. (2)During the freezing process, intermolecular hydrogen bonding between PVA and PAA seemed to increase in parallel with the number of freezing-thawing cycle. (3)The total exothermic enthalpy decreased during the freezing process for PVAs of DP 1700 and 3500, but increased for PVA of DP 2600. This behavior is attributable to the difference in PVA molecular weight. (4)The[PVA-PAA]gels form phase-separated networks that include PAA microdomains containing a large amount of water molecules. (5)The tensile properties and contractility by electric potential were improved with increasing freezing-thawing cycle. Those are due to the fact that[PVA-PAA]gel is phase-separated networks.
社団法人日本材料学会の論文
1995-08-15