Thermal analysis and non-isothermal kinetic study of some pesticides - Part II. Chlorinate derivatives

The thermal behaviour of some commercial pesticides was studied by simultan eous TG/DSC measurements. Kinetic parameters, related to solid-gas phase tr ansition processes, were also carried out by using dynamic TG technique. The kinetics were analysed by using Arrhenius, Satava and Harcourt-Esson eq uations. The choice of the mathematical expression to insert in these equat ions was influenced by the shape of the TG plot and other thermal analysis signals. The compounds studied undergo a fusion process followed by a singl e vaporization process. The latter is well represented by a diffusive proce ss (D-1, D-2 or D-3). The variation of the activation energy values within the range of temperature where the vaporization processes occur was calcula ted. The enthalpy values of vaporization were also evaluated by using the C lausius-Clapeyron equation.