酢酸セルロースの吸湿等温線に及ぼすアセチル基含有量の影響 : 熱分析の結果と比較

概要

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In this study, the sorption isotherms of water vapor by cellulose acetate for various acetvl contents were measured. The BET adsorption theory was modified for the system which has two different kinds of energy levels in the water adsorption sites, i.e. a hydroxyl group and an acetoxyl group, and applied it to the experimental results in order to examine the effect of acctyl content on the sorption isotherm of water using the parameters which represented the total number of adsorption sites, V_m, the interaction energy between water and the adsorption sites, K, and the number of adsorbed layers, n. V_m and K decreased with an increase in acetyl content and n remained constant. The apparent activation energies of the water desoption were also determined usina differential thermal analysis. They are nearly constant with an increase in the acetyl content.
東京聖栄大学の論文
1999-12-20