Diamino-2,6-dinitropyridine-N-oxide

5-Diamino-2,6-dinitropyridine-N-oxide (DADNPO) is more heat resistant than HNS but its performance is equal to HNS. It is used for oil-well completions at higher depth than HNS shaped charges. 

Agrawal and co-workers have reported the synthesis of N,N -bis(l,2,4-triazol-3-yl)-4,4 -diamino-2,2, 3,3, 5,5, 6,6 -octanitroazobenzene (BTDAONAB) [Structure (2.39)] via nitration-oxidative coupling of 4-chloro-3,5-dinitroaniline followed by nucleophilic displacement of the chloro groups with 3-amino-l,2,4-triazole. BTDAONAB has the unique distinction of being the most thermally stable explosive reported so far (DTA exotherm 550 °C) as compared with well-known thermally stable explosives such as TATB (-360°C), TACOT (-410°C), NONA (-440-450°C) and PYX (-460 °C) [25]. 

The most promising thermally stable explosives and their properties are given in Table 2.2. 

The literature suggests that thermally stable explosives such as HNS were employed for seismic experiments on the moon [61]. This is probably due to safety considerations while handling explosives for such applications on the lunar surface. 

Name Melting point/°C Density/ gem-3 Impact sensitivity (f 5o%)/cm VOD/ms 1 Salient properties and applications 

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