Method for Preparing 2,5-Dipcryl-1,3,4-Oxadiazole.
Patent Application, Filed 23 Apr 87,
DEPARTMENT OF THE NAVY WASHINGTON DC
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This invention relates to polynitro aromatic compounds and more particularly to thermally stable polynitro aromatic explosive compounds. 2,5-Dipicryl-1,3,4-oxadiazole is thermally stable in the vicinity of 260 C and has an impact sensitivity of 20 cm as measured by an ERL machine 2.5 Kg weight, type 12 tools on sandpaper. This combination of impact sensitivity and thermal stability is unique. Comparing 2,5 dipicryl-1,3,4-oxadiazole with its nearest competitors see table 1 shows that 2,2,4,4,6,6-hexanitrostilbene HNS and 2,2,2 ,4,44 6,66 -nonanitroterphenyl NONA have similar thermal stabilities but are not as impact sensitive. 2,5-dipicryl-3,4-dinitrofuran has a similar impact sensitivity to 2,5-dipicryl-1,3,4-oxadiazole but it is not as thermally stable. Short pulse shock tests exploding foil on 2,5-dipicryl-1,3,4-oxadiazole showed that it has a shock sensitivity similar to that of pentaerythritol tetranitrate PETN see Table 2. Moreover, the tests also showed that 2,5-dipicryl-1,3,4-oxadiazole has a very sharp threshold of initiation that is, it always detonates when stimulated at the required energy level but does not detonate below this level. This is a very desirable property for an initiating explosive.
- Ammunition and Explosives
- Organic Chemistry