Synthesis And Study Of Nitrogen-rich Energetic Compounds Featuring 1,3,4-oxadizole

Over the past decade,the design and synthesis of high nitrogen content energetic compounds have become the frontier and developing direction of energetic materials.Because of a large number of N-N and C-N bonds in the molecule,these materials with high positive heats of formation(HOF)and high densities will be widely used in military and civilian areas.Due to the importance of the high nitrogen energetic compounds,design and synthesis of high nitrogen enegrtic materials are essential to the development of novel energetic materials.This paper mainly consists of the following three parts:(1)Study and synthesis of the high nitrogen energetic compound with the structure of the trinitromethyl group based on the bi(1,3,4-oxadizole)The trinitromethyl compound 5,5’-bis(trinitromethyl)-2,2’-bi(1,3,4-oxadiazole)was prepared and fully characterized.This neutral compound shows acceptable sensitivities and decomposes at 98.5 ℃.With the detonation pressure of 33.2 GPa and the detonation velocity of 8764 m s-1,it demonstrates attractive energetic properties.(2)Study and synthesis of the high nitrogen energetic compound with the structure of the fluorodinitromethyl group based on the bi(1,3,4-oxadizole)The polynitro compound 5,5’-bis(fluorodinitromethyl)-2,2’-bi(1,3,4-oxadiazole)was synthesized from the 2,2’-bi(1,3,4-oxadiazoly)-5,5’-diacetic acid diethyl ester.In order to investigate the influence of different factors on the reaction results,we chose to change reaction solvents,reaction time and feed ratio.(3)Study and synthesis of the high nitrogen energetic salts based on the bi(1,3,4-oxadizole)Nitrogen-rich salts featuring bi(1,3,4-oxadiazole)were synthesised by facile deprotona-tion or metathesis reactions.Physicochemical as well as energetic properties including density,thermal stability and sensitivity were investigated.Mostly salts decompose at temperatures over 180 ℃.The performance from the calculated heats of formation and experimental densities indicates that many of the compounds have potential applications as energetic materials.