Influence of the Heating Rate in the Thermal Decomposition of HMX |
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Authors: | Pinheiro G F M Lourenço V L Iha K |
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Institution: | 1.Instituto Tecnológico de Aeronáutica, ITA, Brazil ;2.Centro Técnico Aeroespacial, Instituto de Atividades Espaciais/ASB pca. mal. Eduardo Gomes, 50 vila das Acácias, S?o José Campos, SP, CEP 12228-904, Brazil ; |
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Abstract: | This work refers to a study of the thermal decomposition of octahydro-1,3,5,7-tetranitro-1,3,5,7 tetrazocine (HMX) by differential
scanning calorimetry (DSC) in non-isothermal conditions, with heating rates from1 to 25°C min−1. The influence of the heating rate, the particle and the sample size were verified. The activation energy was calculated
using the peak temperature shift method, proposed by Ozawa and a significant variation in the results was observed according
to the range of the used heating rates. As the heating rate was increased, different conversions and self-heating effects
were observed at the respective DSC peaks, indicating that the use of this method was inadequate and it may lead to incorrect
results, which, in turn, could explain the wide range of activation energy values published in literature. At lower heating
rates HMX decomposition occurs on the solid state and at higher ones decomposition occurs after melting practically at the
same temperature, which does not depend on the heating rate.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | DSC HMX thermal decomposition |
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