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cis-1,3,4,6-Tetranitrooctahydroimidazo-[4,5-d]imidazole (BCHMX) as a part of the LOVA explosive mixture
Authors: Zeman Svatopluk | Hussein Ahmed Khaled Mohamed | Elbeih Ahmed Ikhlas Mohamed
Year: 2017
Type of publication: ostatní - článek ve sborníku
Name of source: HEMCE 2017 : proceedings
Publisher name: High Energy Materials Society of India
Place: Chandrigarh
Page from-to: nestránkováno
Titles:
Language Name Abstract Keywords
eng cis-1,3,4,6-Tetranitrooctahydroimidazo-[4,5-d]imidazole (BCHMX) as a part of the LOVA explosive mixture A relatively new high performance nitramine, cis-1,3,4,6-tetranitrooctahydroimidazo-[4,5-d]imidazole (BCHMX), is roughly sensitive as pentaerythritol tetranitrate (PETN). Nevertheless, possibilities exist to suppress of this sensitivity. In this connection BCHMX is incorporated into explosive mixture with 3-nitro-1,2,4-triazol-5-one (NTO) in wt. ratio 1:1 of both the explosives and bonded by polydimethylsiloxane (PDMS) terminated by trimethylsilyl groups. For comparison PBXs are used, bonded also by PDMS and filled by RDX (1,3,5-trinitro-1,3,5-triazinane), HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazocane), BCHMX and ϵ-CL20 (ϵ-2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane, ϵ-HNIW), including LOVA mixture 1:1 of NTO with TNT (TNTO) and own TNT is included in this comparison.This BCHMX/NTO PBX is studied by means of thermogravimetry (TG) and modified vacuum stability test (VST). A new relationship between zero order rate constants from VTS and heats of formation of the studied explosives is found out which confirms increase of thermal reactivity with increasing of the energetic content of explosives. Impact and friction sensitivities in addition to the measured detonation velocities and the calculated detonation characteristics (EXPLO5 code) are obtained. Relations between these sensitivities and volume heats of explosion are shown. Results of the thermo-analytical measurements show a certain instability of PDMS in the presence of NTO over 170 °C and decomposition of NTO as a solution in degradation products of this binder in temperature region typical for thermal decomposition of BCHMX. Nevertheless, the PDMS matrix shows to be a good binder for a LOVA explosive, filled by BCHMX and NTO, due to its markedly positive effect on increasing of resistance of this PBX against mechanical stimuli and a good thermal stability. cis-1,3,4,6-tetranitrooctahydroimidazo-[4,5-d]imidazole; 3-nitro-1,2,4-triazol-5-one; polydimethylsiloxane; PBX; thermal stability; sensitivity

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