A new compound, [（NH2）2C=NH2]＋N（NO2）2-（GDN）, was prepared by mixing ammonium dinitramide （ADN） and guanidine hydrochloride in water. The thermal behavior of GDN was studied under the non-isothermal conditions...A new compound, [（NH2）2C=NH2]＋N（NO2）2-（GDN）, was prepared by mixing ammonium dinitramide （ADN） and guanidine hydrochloride in water. The thermal behavior of GDN was studied under the non-isothermal conditions with DSC and TG/DTG methods. The apparent activation energy（E） and pre-exponential constant（A） of the exothermic decomposition stage of GDN were 118.75 kJ/mol and 10^10.86 s^-1, respectively. The critical temperature of the thermal explosion（Tb） of GDN was 164.09 ℃. The specific heat capacity of GDN was determined with the Micro-DSC method and the theoretical calculation method, and the standard molar specific heat capacity was 234.76 J·mol^-1·K^-1 at 298.15 K. The adiabatic time-to-explosion of GDN was also calculated to be a certain value between 404.80 and 454.95 s.展开更多
A series of guanidine salts of 4,4＇-azo-l,2,4-triazol-5-one with guanidine（1）, aminoguanidine（2）, diaminoguanidine（3） and triaminoguanidine（4） was prepared. Compounds 2--4 were characterized by infrared（IR）...A series of guanidine salts of 4,4＇-azo-l,2,4-triazol-5-one with guanidine（1）, aminoguanidine（2）, diaminoguanidine（3） and triaminoguanidine（4） was prepared. Compounds 2--4 were characterized by infrared（IR） spectroscopy, elemental analysis and single-crystal X-ray diffraction. Thermal decomposition processes of compounds 1--4 were investigated by differential scanning calorimetry（DSC）, and all the compounds showed good thermal stability up to 190 ℃. Moreover, these four guanidine salts are more unstable with the increasing number of amino groups. Thermal stability parameters（Te,0 and Tb）and thermodynamic functions（△S≠, △H≠ and △G≠） for compounds 1-4 were calculated. The constant-volume combustion heats（AcU） for compounds 2--4 were determined and tended to increase with the increase of the number of amino groups. The calculated standard molar enthalpies of forma- tion（△ρH0m） of compounds 2-4 are -541.04, -178.67 and-83.08 kJ/mol, respectively. The impact sensitivities results indicate that these four energetic salts are less sensitive than 1,3,5-trinitrotriazacyccohexane（RDX） and 1,3,5,7- tetranitrotetraqza-cyclo-octane（HMX）.展开更多
基金Supported by the National Natural Science Foundation of China(No.20803058)Xi’an Scientific and Technical Plan Foundation, China(No.YF07106).
文摘A new compound, [（NH2）2C=NH2]＋N（NO2）2-（GDN）, was prepared by mixing ammonium dinitramide （ADN） and guanidine hydrochloride in water. The thermal behavior of GDN was studied under the non-isothermal conditions with DSC and TG/DTG methods. The apparent activation energy（E） and pre-exponential constant（A） of the exothermic decomposition stage of GDN were 118.75 kJ/mol and 10^10.86 s^-1, respectively. The critical temperature of the thermal explosion（Tb） of GDN was 164.09 ℃. The specific heat capacity of GDN was determined with the Micro-DSC method and the theoretical calculation method, and the standard molar specific heat capacity was 234.76 J·mol^-1·K^-1 at 298.15 K. The adiabatic time-to-explosion of GDN was also calculated to be a certain value between 404.80 and 454.95 s.
文摘A series of guanidine salts of 4,4＇-azo-l,2,4-triazol-5-one with guanidine（1）, aminoguanidine（2）, diaminoguanidine（3） and triaminoguanidine（4） was prepared. Compounds 2--4 were characterized by infrared（IR） spectroscopy, elemental analysis and single-crystal X-ray diffraction. Thermal decomposition processes of compounds 1--4 were investigated by differential scanning calorimetry（DSC）, and all the compounds showed good thermal stability up to 190 ℃. Moreover, these four guanidine salts are more unstable with the increasing number of amino groups. Thermal stability parameters（Te,0 and Tb）and thermodynamic functions（△S≠, △H≠ and △G≠） for compounds 1-4 were calculated. The constant-volume combustion heats（AcU） for compounds 2--4 were determined and tended to increase with the increase of the number of amino groups. The calculated standard molar enthalpies of forma- tion（△ρH0m） of compounds 2-4 are -541.04, -178.67 and-83.08 kJ/mol, respectively. The impact sensitivities results indicate that these four energetic salts are less sensitive than 1,3,5-trinitrotriazacyccohexane（RDX） and 1,3,5,7- tetranitrotetraqza-cyclo-octane（HMX）.
