KINET IC ANALYSIS OF DERIVATIVE CURVES IN THERMAL ANALYSIS

Two methods of obtaining kinetic parameiers from derivative thermoanalytical curves are proposed. The methods are based on the general form of kinetic formulae and are applicable to general types of reactions governed by a single activation energy. One method utilizes the linear relation between peak temperature and heating rate in order to estimate the activation energy, and only the information of the rate of conversion versus the temperature is necessary. The other method needs the information of both the conversion and the rate of conversion versus the temperature, and the Arrhenius plot is made for an assumed kinetic mecha!aism, Various types of thermal analysis have been applied in almost all fields of material research. The thermoanalytical method, in which the properties of a sample heated at a constant rate of heating are observed continuously, is an effective method when the thermal response time is large compared with the rate of the process and considerable change occurs during the period of heating the sample up ~o ~the desired temperature in an isothermal measurement. For kinetic investigation of the pyrolysis of a substance, thermogravimetry has been utilize