Comparison of the thermal decompositions of HMX and 2,4-DNI for evaluation of slow cookoff response and long-term stability

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Thermal decomposition of HMX between 175C and 200C was studied using the simultaneous thermogravimetric modulated beam mass spectrometer with focus on initial stages of the decomposition. Thermal decomposition products are the same as in previous higher temperature experiments. The initial stages of the decomposition have an induction period followed by two acceleratory periods. Arrhenius parameters for the induction and two acceleratory periods are (Log(A)= 18.2 {plus_minus} 0.8, Ea = 48.2 {plus_minus} 1.8 kcal/mole), (Log (A) = 17.15 {plus_minus} 1.5 and Ea = 48.9 {plus_minus} 3.2 kcal/mole), (Log (A) = 19.1 {plus_minus} 3.0 and Ea = 52.1 {plus_minus} 6.3 kcal/mole). This ... continued below

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12 p.

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Minier, L.; Behrens, R. & Bulusu, S. December 1, 1995.

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  • Minier, L.
  • Behrens, R. Sandia National Labs., Albuquerque, NM (United States)
  • Bulusu, S. Army Armament Research and Development Command, Dover, NJ (United States). Energetic Materials Div.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Thermal decomposition of HMX between 175C and 200C was studied using the simultaneous thermogravimetric modulated beam mass spectrometer with focus on initial stages of the decomposition. Thermal decomposition products are the same as in previous higher temperature experiments. The initial stages of the decomposition have an induction period followed by two acceleratory periods. Arrhenius parameters for the induction and two acceleratory periods are (Log(A)= 18.2 {plus_minus} 0.8, Ea = 48.2 {plus_minus} 1.8 kcal/mole), (Log (A) = 17.15 {plus_minus} 1.5 and Ea = 48.9 {plus_minus} 3.2 kcal/mole), (Log (A) = 19.1 {plus_minus} 3.0 and Ea = 52.1 {plus_minus} 6.3 kcal/mole). This data can be used to calculate the time and temperature required to decompose a desired fraction of a test sample testing the effect of thermal degradation on sensitivity or bum rates. It can also be used to estimate the extent of decomposition expected under normal storage conditions for munitions containing HMX. This data, along with previous mechanistic studies conducted at higher temperatures, suggest that the process that controls the early stages of decomposition of HMX in the solid phase is scission of the N-NO{sub 2} bond, reaction of the N0{sub 2} within a lattice cage to form the mononitroso analogue of HMX and decomposition of the mononitroso HMX within the HMX lattice to form gaseous products that are retained in bubbles or diffuse into the surrounding lattice. These methods evaluating HMX can be used to evaluate new energetic materials such as 2,4-DNI. The early 2,4-DNI thermal decomposition is characterized by an initial decomposition, an apparent induction period, then an initial acceleratory period. The main gaseous products are NO, C0{sub 2}, HNCO, H{sub 2}0, N{sub 2}, CO, HCN and C{sub 2}N{sub 2}. The presence of adsorbed and occluded H{sub 2}0 is the major cause of the early decomposition.

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12 p.

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OSTI as DE96002484

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  • Joint Army Navy NASA Air Force propulsion systems hazards subcommittee meeting, Huntsville, AL (United States), 23-27 Oct 1995

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  • Other: DE96002484
  • Report No.: SAND--96-8403C
  • Report No.: CONF-9510228--5
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 158469
  • Archival Resource Key: ark:/67531/metadc623405

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  • December 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • June 22, 2016, 6:49 p.m.

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Minier, L.; Behrens, R. & Bulusu, S. Comparison of the thermal decompositions of HMX and 2,4-DNI for evaluation of slow cookoff response and long-term stability, article, December 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc623405/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.