Accession Number : ADD013462

Title :   Method for Preparing 2,5-Dipcryl-1,3,4-Oxadiazole.

Descriptive Note : Patent Application, Filed 23 Apr 87,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Sitzmann, Michael E

Report Date : 23 Apr 1987

Pagination or Media Count : 15

Abstract : 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 ,4,4'4 6,6'6 -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.

Descriptors :   *AROMATIC COMPOUNDS, *EXPLOSIVES, *EXPLOSIVES INITIATORS, *NITROGEN COMPOUNDS, *POLYMERS, *PATENT APPLICATIONS, ENERGY LEVELS, IMPACT, PETN, SENSITIVITY, SHOCK, SHOCK TESTS, SHORT PULSES, THERMAL STABILITY

Subject Categories : Ammunition and Explosives
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE