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1 Central European Journal of Energetic Materials

1 2010

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Applicability of Non-isothermal DSC and Ozawa Method for Studying Kinetics of Double Base Propellant Decomposition

Matečić Mušanić S., Fiamengo Houra I., Sućeska M.

Central European Journal of Energetic Materials

2010

Vol. 7, nr 3

233-251

In order to determine Arrhenius kinetic constants various experimental techniques and testing conditions have been used. Also, various kinetic approaches and data treatment procedures have been applied, resulting sometimes in considerable disagreement in the values of the kinetic parameters reported in literature. Kinetics of decomposition of DB propellants from non-isothermal DSC experiments using unhermetically closed sample pans, and effect of nitroglycerine (NG) evaporation on the kinetic results and kinetics of NG evaporation has been studied by isothermal thermogravimetry. It has been shown by experiments and numerical simulation that at slower heating rates and smaller sample mass NG may completely evaporate before DSC peak maximum, resulting in a higher values of the activation energy (173 kJ/mol). At faster heating rates and larger sample masses certain amount of NG still exists in the propellant at the peak maximum temperature, resulting in lower values of the activation energy (142 kJ/mol). The discontinuity point on the Ozawa plot is connected with the presence of NG in the propellant at DSC peak maximum temperature. This implies that the activation energy obtained using small samples and slow heating rates (173 kJ/mol) corresponds to the activation energy of decomposition of nitrocellulose from DB propellant.