Characterization of Gun Propellants by Long‐Term Mass Loss Measurements

Three different gun propellants (A5020, JA‐2 or L5460, NK1074) have been investigated up to 35 years by mass loss at isothermal temperatures between 30 °C and 90 °C. From these data, activation energies for the different reactions of zero order (mass loss increase up to stabilizer consumption) and f...

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Published inPropellants, explosives, pyrotechnics Vol. 42; no. 7; pp. 706 - 711
Main Authors Heil, Moritz, Wimmer, Kerstin, Bohn, Manfred A.
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 01.07.2017
Subjects
Activation energy
Annual variations
Evaporation
Graphs
Gun propellants
kinetic description
Long term mass loss
nitrocellulose decomposition
propellant stabilizer consumption
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Summary:Three different gun propellants (A5020, JA‐2 or L5460, NK1074) have been investigated up to 35 years by mass loss at isothermal temperatures between 30 °C and 90 °C. From these data, activation energies for the different reactions of zero order (mass loss increase up to stabilizer consumption) and first order (solvent evaporation at begin) are derived. The mass loss data are described very well by a combination of these two reactions. Stabilizer consumption has been determined by HPLC. In case of diphenylamine (DPA), several consecutive products (mononitro‐DPA up to tetranitro‐DPA) have been regarded also. Activation energies are in the range of energies obtained by other methods: 84 kJ/mol [A5020], 150 kJ/mol [JA‐2], 100 kJ/mol [NK 1074]). Long term measurements show seasonal influence in the mass loss data. Respective graphs are shown in this work. At least four years of measurement are recommended to compensate for the signal drift caused by seasonal changes.
ISSN:0721-3115
1521-4087
DOI:10.1002/prep.201700064