Abstract: The thermal decomposition of DMAc was studied by C80 Calorimetry in order to investigate the thermal stability and themal safety of DMAc. The characteristic curves and experimental data of a decomposition were obtained. The kinetics parameters including the activation energy, preexponential factor and reaction enthalpy were calculated by the thermal kinetics analysis method.Meanwhile,based on these kinetic parameters,the self-accelerating decomposition temperature(SADT) was calculated and the thermal safety on DMAc was evaluated. The results showed that self-exothermic decomposition reaction occurred in the air atmosphere. The heat of reaction was 32KJ/Kg. The activation energy was 178.1KJ/mol. The SADT was calculated according to the Sememnov model, and its value was 93.7℃. DMAc has a larger thermal hazard. In the using and storage process,the temperature rising should be prevented, or else, the explosion accident of the DMAc will be initiated by self-exothermic decomposition reaction.

Key words: dimethylacetanide, thermal decomposition, kinetics parameters, self-accelerating decomposition temperature