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Characterization of gun propellants by long-term mass loss measurements

: Heil, Moritz; Wimmer, Ann-Kathrin; Bohn, Manfred A.

Postprint urn:nbn:de:0011-n-4559420 (752 KByte PDF)
MD5 Fingerprint: 74c3664af6e6c1ddc533943b5daa5f09
Erstellt am: 2.8.2018

Propellants, explosives, pyrotechnics 42 (2017), Nr.7, S.706-711
ISSN: 0340-7462
ISSN: 0721-3115
ISSN: 1521-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ICT ()

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.