Non-isothermal kinetic study of the thermal decomposition ofN-{bis[benzyl(methyl)amino]phosphoryl}-2,2-dichloroacetamideand N-{bis[dibenzylamino]phosphoryl}-2,2-dichloroacetamide

摘要

In this paper, the thermal behaviours ofN-{ bis[benzyl(methyl) amino} phosphoryl } -2,2-dichloro-acetamide (BMA) and N-{ bis[dibenzylamino]phosphoryl } -2,2-dichloroacetamide (DBA) were studied by thermo-gravimetery (TG) and differential scanning calorimetery(DSC) techniques under the non-isothermal conditions.The results showed that BMA melts about 120 °C before itdecomposes. BMA decomposition occurs in three contin-uous steps, in the 170-400 °C temperature range. Eachthermal degradation stage for BMA results an exothermicpeak in the DSC curve. On the other hand, applying TG-DSC techniques indicates that DBA melts about 175 °Cbefore it decomposes. This compound decomposes in thetemperature range of 200-600 °C in three steps. Activationenergy and pre-exponential factor for each compound werefound by means of Kissinger method and were verified byOzawa–Flynn–Wall method. Activation energy obtainedby Kissinger method for the first stage of BMA and DBAdecompositions are 151.8 (±2.0) KJ mol~(-1)and 138.7 (±2.6) KJ mol~(-1), respectively. Finally, the thermodynamicparameters (ΔG~#, ΔH~#and ΔS~#) for first step decomposi-tion of DBA and BMA were determined.