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Influence of the Heating Rate in the Thermal Decomposition of HMX

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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.

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Authors and Affiliations

  1. Instituto Tecnológico de Aeronáutica, ITA, Brazil

    G. F. M. Pinheiro & K. Iha

  2. Centro Técnico Aeroespacial, Instituto de Atividades Espaciais/ASB pca. mal. Eduardo Gomes, 50 vila das Acácias, São José Campos, SP, CEP 12228-904, Brazil

    G. F. M. Pinheiro & V. L. Lourenço

Authors
  1. G. F. M. Pinheiro
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  2. V. L. Lourenço
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  3. K. Iha
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Correspondence to G. F. M. Pinheiro.

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Pinheiro, G.F.M., Lourenço, V.L. & Iha, K. Influence of the Heating Rate in the Thermal Decomposition of HMX. Journal of Thermal Analysis and Calorimetry 67, 445–452 (2002). https://doi.org/10.1023/A:1013984813195

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