Synthesis,Thermal Behavior And Combustion Heat Of 2-Nitromino-5-Nitro-Hexahyro-1,3,5-Triazine (NNHT) Derivatives

As a novel high-nitrogen triazine energetic material,2-nitromino-5-nitro-hexahydro-1,3,5-triazine ?NNHT? draw much attention because of the characteristics of high energy, low sensitivity and positive enthalpy of formation, which is quite significant to the further research of NNHT.Six derivatives of NNHT were synthesized in this essay, which are copper complex Cu ?C₃H₆N₆O₄? ?CH₃COO?2·H₂O and zinc complex Zn ?C₃H₆N₆O₄? ?CH₃COO?2·2H₂O; copper salt Cu?C₃H₄N₆O₄?·H₂O and cadmium salt Cd?C₃H₄N₆O₄?·2H₂O;hydrazine hydrate salt ?C₃H₅N₆O₄??N₂H₅·H₂O? and 1,3-propanediamine salt ?C₃H₄N₆O₄?[N₂H₆?CH₂?₃], respectively. Their structures were characterized by elemental analysis and IR.The DSC and TG/DTG methods were used to study the thermal behavior of the six derivatives. The Kissinger and Ozawa methods were employed to determine the kinetic equation of thermal decomposition process, and the thermal stability were also determined.The continuous specific heat capacity of the six derivatives of NNHT were determined using Micro-DSC? instrument. Thermodynamic function values??H??S and ?G? of the compounds between 283 K and 353 K based on 293.15 K were calculated. Furthermore, the self-accelerating decomposition temperature?TSADT?, critical temperature of thermal explosion?Tb?, thermal ignition temperature?TTIT? and adiabatic time-to-explosion?tTIAD? were calculated, which can be used to estimate thermal safety and stability of the compounds directly.The combustion heats of NNHT, Cu?C₃H₄N₆O₄?H₂O5 Cd?C₃H₄N₆O₄?·2H₂O, ?C₃H₅N₆O₄??N₂H₅·H₂O? and ?C₃H₄N₆O₄?[N₂H₆?CH₂?₃] were characterized by IKAC5000 oxygen nitrogen calorimeter. The corresponding standard enthalpys of combustion of the five energetic compounds ??c/Hm?? are ?1980.59±10.18?, ?1931.60±14.29?, ?1734.15±15.31?, ?2735.49±19.2? and ?3434.64±11.32?kJ·mol-1, respectively. The corresponding standard enthalpys of formation ??fHm?? are separately ?49.48±8.37?,?252.59±14.20?,?458.44±15.34?, ?134.42±19.48? and ?213.62±10.43? kJ·mol-1.