Abstract
Abstract Poly( N -vinyl-2-pyrrolidone) (PVP) gels were prepared by irradiating aqueous solutions with γ -rays. Swelling behavior was investigated as a function of salt concentration in the immersing solution. The observed anion specificity for the swelling ratio in the higher concentration region of potassium salts (≧ca. 1 M) was SO 2- 4 - - - ≦I - , and the cation specificity of chlorides, which was less marked than that of the anion, was Cs + + ≦Na + + ≦Ca 2+ 2+ . The hydrogen bond enthalpy of water (Δ H HB ) in the gel was estimated by IR measurement. The Δ H HB values showed a clear correlation with the swelling ratios; the water hydrogen bond is stronger for systems of higher swelling ratios except for iodides and thiocyanates. The non-freezable water (NFW) content of the gel was evaluated by DSC measurement. The amount of NFW increases for chlorides that show higher swelling ratios. All the results, except for those for I - and SCN - ions which probably are bound to PVP, are reasonably interpreted on the basis of a mechanism for ion specific swelling proposed in the previous study.
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