Study On Synthesis And Performance Of Novel Energetic Compounds Based On Oxadiazole Framework

The development of new energetic compounds is one of the important contents in the field of energetic materials.In recent years,energetic compounds based on nitrogen heterocyclic framework represent a new class of energetic materials,which have the characteristics of positive enthalpy of formation and high thermal stability,and have promising research value.After in-depth research,in this thesis several novel energetic compounds based on oxadiazole framework were designed and synthesized,their structures and purity were characterized,and their energetic properties and safety were also studied.1)Synthesis and properties of novel energetic compounds based on bridged bi-oxadiazole frameworkA novel energetic compound based on asymmetric oxadiazole bicycles,i.e.,5-(5-(nitroamino)-1,3,4-oxadiazole-2-y1)-1,2,4-oxadiazole-3-yl)nitramide(87),was designed and synthesized from ethyl cyanocarbonate.The molecular and crystal structures of this compound were characterized by means of NMR,elemental analysis,IR and X-ray single crystal diffraction.The thermal properties were evaluated by DSC,and the decomposition temperature was 176℃.The detonation velocity and detonation pressure are calculated to be 8888 m·S-1 and 34.1 GPa respectively.The mechanical sensitivity was tested by BAM method,and its impact and friction sensitivity were 10 J and 108 N,respectively.2)Synthesis and properties of novel energetic molecules based on oxadiazole tetracyclic framework and derived energetic saltsTwo oxadiazole isomers were selected as the matrix and glyoxime was used as the starting material to synthesize 3,3’-bis(2-nitramino-1,3,4-oxadiazole-4-yl)-5,5’-bis-1,2,4-oxadiazole(BNOBO).Three derived energetic salts were synthesized by using the acidity of nitramine group.The structure and properties of the energetic compounds were studied.The results show that the thermal decomposition temperature of BNOBO is 215℃,the theoretical energy level and the measured mechanical sensitivity are comparable to that of RDX.All the three energetic salts showed good thermal stability and energetic performances.3)Synthesis and properties of a novel energetic inner salt based on monocyclic oxadiazole frameworkA novel energetic inner salt based on oxadiazole monocyclic framework was obtained by using the commercial reagent potassium malonate as the starting raw material,followed by introducing the amido dinitro and amino into the molecule successively after three steps of reaction,and ingeniously integrating the anions and anions into the same molecule.Compared with the traditional energetic salts,it is found that the energetic inner salt has better crystal stacking efficiency and crystal density,which shows a higher energy level,while maintaining the low sensitivity of the traditional energetic salts.It is a new strategy to develop new low sensitivity energetic materials.