Abstract
In this study, the coefficient of evaporation values, activation energies and pre-exponential factors were determined for two fixatives, namely benzophenone and cinnamic acid. Simultaneous TG–DTA data and rising temperature kinetics were used for this purpose. The coefficient of evaporation values at different temperatures were determined using rising temperature data obtained from DTG plots. These were then used to calculate the activation energy for the endothermic process of evaporation, on the basis that the rate mechanism is of zero order. The pre-exponential factors were obtained from corresponding kinetic plots. The results show that the activation energy for this evaporation process approaches the enthalpy of vaporization, which is in agreement with the simple relationship between these two for any given endothermic process.
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