Solid-phase thermal decomposition of 2,4-dinitroimidazole (2,4-DNI)

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The solid-phase thermal decomposition of the insensitive energetic nitroaromatic heterocycle 2,4-dinitroimidazole (2,4-DNI: mp 265--274C) is studied utilizing simultaneous thermogravimetric modulated beam mass spectrometry (STMBMS) between 200 and 247C. The pyrolysis products have been identified using perdeuterated and {sup 15}N-labeled isotopomers. The products consist of low molecular-weight gases and a thermally stable solid residue. The major gaseous products are NO, CO{sub 2}, CO, N{sub 2}, HNCO and H{sub 2}O. Minor gaseous products are HCN, C{sub 2}N{sub 2}, NO{sub 2}, C{sub 3}H{sub 4}N{sub 2}, C{sub 3}H{sub 3}N{sub 3}O and NH{sub 3}. The elemental formula of the residue is C{sub 2}HN{sub 2}O and ... continued below

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9 p.

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Minier, L.; Behrens, R. Jr. & Bulusu, S. December 31, 1996.

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  • Minier, L.
  • Behrens, R. Jr. Rome Astronomical Observatory (Italy). Space Physics Research Center
  • Bulusu, S. Army Armament Research and Development Command, Dover, NJ (United States). Energetic Materials Div.

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The solid-phase thermal decomposition of the insensitive energetic nitroaromatic heterocycle 2,4-dinitroimidazole (2,4-DNI: mp 265--274C) is studied utilizing simultaneous thermogravimetric modulated beam mass spectrometry (STMBMS) between 200 and 247C. The pyrolysis products have been identified using perdeuterated and {sup 15}N-labeled isotopomers. The products consist of low molecular-weight gases and a thermally stable solid residue. The major gaseous products are NO, CO{sub 2}, CO, N{sub 2}, HNCO and H{sub 2}O. Minor gaseous products are HCN, C{sub 2}N{sub 2}, NO{sub 2}, C{sub 3}H{sub 4}N{sub 2}, C{sub 3}H{sub 3}N{sub 3}O and NH{sub 3}. The elemental formula of the residue is C{sub 2}HN{sub 2}O and FTIR analysis suggests that it is polyurea- and polycarbamate-like in nature. Rates of formation of the gaseous products and their respective quantities have been determined for a typical isothermal decomposition experiment at 235C. The temporal behaviors of the gas formation rates indicate that the overall decomposition is characterized by a sequence of four events; (1) an early decomposition period induced by impurities and water, (2) an induction period where C0{sub 2} and NO are the primary products formed at relatively constant rates, (3) an autoacceleratory period that peaks when the sample is depleted and (4) a final period in which the residue decomposes. Arrhenius parameters for the induction period are E{sub a} = 46.9 {plus_minus} 0.7 kcal/mol and Log(A) = 16.3 {plus_minus} 0.3. Decomposition pathways that are consistent with the data are presented.

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9 p.

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OSTI as DE96003252

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995

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  • Other: DE96003252
  • Report No.: SAND--96-8451C
  • Report No.: CONF-951155--13
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 174686
  • Archival Resource Key: ark:/67531/metadc669221

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • June 23, 2016, 10:35 a.m.

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Minier, L.; Behrens, R. Jr. & Bulusu, S. Solid-phase thermal decomposition of 2,4-dinitroimidazole (2,4-DNI), article, December 31, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc669221/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.