Actions for Thermal decomposition of HMX [electronic resource] : Low temperature reaction kinetics and their use for assessing response in abnormal thermal environments and implications for long-term aging

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Thermal decomposition of HMX [electronic resource] : Low temperature reaction kinetics and their use for assessing response in abnormal thermal environments and implications for long-term aging

Published
Washington, D.C. : United States. Dept. of Defense, 1995.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
10 pages : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Department of Defense, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The thermal decomposition of HMX between 175 and 200°C has been studied using the simultaneous thermogravimetric modulated beam mass spectrometer (STMBMS) apparatus with a focus on the initial stages of the decomposition. The identity of thermal decomposition products is the same as that measured in previous higher temperature experiments. The initial stages of the decomposition are characterized by an induction period followed by two acceleratory periods. The Arrhenius parameters for the induction and two acceleratory periods are (Log(A) = 18.2 ± 0.8, Ea = 48.2 ± 1.8 kcal/mole), (Log(A) = 17.15 ± 1.5 and Ea = 48.9 ± 3.2 kcal/mole), (Log A) = 19.1 ± 3.0 and Ea = 52.1 ± 6.3 kcal/mole), respectively. This data can be used to calculate the time and temperature required to decompose a desired fraction of a sample that is being prepared to test the effect of thermal degradation on its sensitivity or burn rates. It can also be used to estimate the extent of decomposition that may be 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-NO₂ bond, reaction of the N0₂ 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.
Report Numbers
E 1.99:sand--96-8452c
E 1.99: conf-951155--14
conf-951155--14
sand--96-8452c
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Note
Published through SciTech Connect.
12/01/1995.
"sand--96-8452c"
" conf-951155--14"
"DE96003250"
Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995.
Behrens, R.; Bulusu, S.
Funding Information
AC04-94AL85000
View MARC record | catkey: 14655349