Ammonium dinitramide (ADN) prills were prepared by emulsion crystallization and characterized by optical microscopic, thermogravimetric
(TG) and differential scanning calorimetric (DSC) techniques. The isothermal and non-isothermal decomposition kinetics of
ADN prills were studied by TG. The differential isoconversional method of Friedman (FR) and integral isoconversional method
of Vyazovkin were used to investigate the dependence of activation energy (Ea) with conversion (α) and the results were compared with literature data. The dependence of activation energy was also derived
from isothermal data. A strong dependence of Ea with α is observed for the ADN prills. All the methods showed an initial increase in Ea up to α=∼0.2 and later decreases over the rest of conversion. The apparent Ea values of FR method are higher than that of Vyazovkin method up to α=∼0.45. The calculated mean Ea values by FR, Vyazovkin and standard isoconversional method for α between 0.05 and 0.95 were 211.0, 203.9 and 156.9 kJ mol−1, respectively.
Authors:V. M. Abdul Mujeeb, M. H. Aneesh, K. Muraleedharan, T. G. Devi, and M. P. Kannan
excellent fits for both isothermal and nonisothermal data for the thermal decomposition of HMX and ammoniumdinitramide, but yields highly uncertain values for Arrhenius parameters when applied to nonisothermal data, implying better reliability for