Kinetic studies of acetophenone derivative oximes and investigation of thermal decomposition mechanism

In this study, two acetophenone derivatives, isonitrosomethyl-p-tolyl ketone (L1) and isonitroso-p-chloroacetophenone (L2), were resynthesized, and their thermal decompositions were investigated kinetically and thermodynamically. Nitrogen gas (5, 10, 15 min flow rate) was used as an inert medium in the thermal decompositions of both ligands. Kinetic analyses were first performed independently of the model using Flynn Wall Ozawa (FWO) and Kissinger Akahira Sunose (KAS) methods, and the effective model in the progression of the reaction was examined by combining the FWO and KAS equations with the model equations together with the graphs of the variation of activation energies with the event fraction. The thermal breakdown processes of L1 and L2 occurred within 25 to 600°C. The effect of heating rate on the TG and DTG curves was studied. As the heating rate went up, so did the temperature needed for the synthetic chemical compounds to break down. The activation energies of the L1molecule, as determined by the KAS and FWO techniques, were 75.96 kJ∙mol-1 and 79.49 kJ∙mol-1, respectively. The computed values for the L2 molecule were 43.80 and 49.37 kJ∙mol-1, respectively.