Thermal Decomposition Kinetics of HMX

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Nucleation-growth kinetic expressions are derived for thermal decomposition of HMX from a variety of types of data, including mass loss for isothermal and constant rate heating in an open pan, and heat flow for isothermal and constant rate heating in open and closed pans. Conditions are identified in which thermal runaway is small to nonexistent, which typically means temperatures less than 255 C and heating rates less than 1 C/min. Activation energies are typically in the 140 to 165 kJ/mol regime for open pan experiments and about 150-165 kJ/mol for sealed-pan experiments. The reaction clearly displays more than one process, ... continued below

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Burnham, A K & Weese, R K March 17, 2005.

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Nucleation-growth kinetic expressions are derived for thermal decomposition of HMX from a variety of types of data, including mass loss for isothermal and constant rate heating in an open pan, and heat flow for isothermal and constant rate heating in open and closed pans. Conditions are identified in which thermal runaway is small to nonexistent, which typically means temperatures less than 255 C and heating rates less than 1 C/min. Activation energies are typically in the 140 to 165 kJ/mol regime for open pan experiments and about 150-165 kJ/mol for sealed-pan experiments. The reaction clearly displays more than one process, and most likely three processes, which are most clearly evident in open pan experiments. The reaction is accelerated for closed pan experiments, and one global reaction fits the data fairly well. Our A-E values lie in the middle of the values given in a compensation-law plot by Brill et al. (1994). Comparison with additional open and closed low temperature pyrolysis experiments support an activation energy of 165 kJ/mol at 10% conversion.

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PDF-file: 14 pages; size: 0.6 Mbytes

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  • Presented at: 36th Intl. ICT Conf and 32nd Inl. Pyrotechnics Seminar, Karlsruhe, Germany, Jun 28 - Jul 01, 2005

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  • Report No.: UCRL-CONF-210681
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 862375
  • Archival Resource Key: ark:/67531/metadc793211

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  • March 17, 2005

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  • Dec. 19, 2015, 7:14 p.m.

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  • Dec. 2, 2016, 3:27 p.m.

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Burnham, A K & Weese, R K. Thermal Decomposition Kinetics of HMX, article, March 17, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc793211/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.