熱重量および示差走査熱量測定結果の速度論的解析法

概要

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Kinetic analysis of thermal decomposition was carried out using thermogravimetry (TG) and differential scanning calorimetry (DSC). The linear equations of n order, phase-boundary, nucleation growth and diffusion-controlled reaction under linear heating conditions were derived for the estimation of the rate constant and the activation energy. The method to determine the reaction mechanism was shown by evaluation of linearity. The equations were applied to the TG and DSC curves of dehydration of calcium oxalate monohydrate and elimination of carbon monoxide from calcium oxalate. The dehydration was fit to two-dimensional phase-boundary reaction and the activation energy was calculated as 85 kJ/mol. But the dehydration at a high-speed heating rate proceeded as apparent three-dimensional diffusion-controlled reaction. The elimination of carbon monoxide from calcium oxalate was fit to phase-boundary reaction and the activation energy was calculated as 196 kJ/mol for three-dimensional phase-boundary reaction and 182 kJ/mol for two-dimensional phase-boundary reaction.
公益社団法人日本薬学会の論文
1983-01-25