修飾コラ-ゲン膜の水分吸収

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Water-vapor absorption isotherms and initial diffusion cocfficients have been measured on bovine hide collagen membranes after chemical modifications. The modifications are the methyl esterification of carboxyl groups, the acetylation and the succinylation of amino groups, and the formaldehyde treatment after the succinylation. The water uptake decreases by the esterification or the acetylation over the wide range of relative humidities. However, the uptake of esterified membrane rises rapidly only at very high humidities. In case of the succinylated membrane, at low humidities, the equilibrium water content is smaller than that of unmodified membrane, but at high humidities, the isotherm almost agrees with that of unmodified membrane. The difference in the water uptake between the formaldehyde-treated and untreated succinylated membranes is slight: by the formaldehyde treatment, the uptake increases slightly at intermediate humidities. In general, the initial part of reduced absorption curves at low humidities gives nearly a straight line which indicates Fickian diffusion. At high humidities, it is slightly curved. The initial diffusion coefficient calculated under the assumption that the diffusion is approximately Fickian over the entire range of relative humidities increases with increasing humidity. Except in case of the acetylated membrane, it reaches a maximum value in the range of 65_??_80% relative humidity and then falls.
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修飾コラ-ゲン膜の水分吸収

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