Nonisothermal decomposition kinetics, specific heat capacity, and adiabatic time-to-explosion of Zn(NH_3)_2(FOX-7)_2

摘要

A new energetic zinc-FOX-7 complex, Zn(NH_3)_2(FOX-7)_2 (FOX-7 = 1,1-diamino-2,2-dinitroethylene), was first synthesized. Thermal decomposition behavior and nonisothermal decomposition kinetics of Zn(NH_3)_2(FOX-7)_2 were studied with DSC and TG/DTG methods. The kinetic equation obtained is da/dT= 10~(13:99)/β 4(1- a)[-ln(1- a)~(3/4) exp(-1.448 × 10~5/RT). The selfaccelerating decomposition temperature (T_(SADT)) and critical temperature of thermal explosion (T_b) are 183.2 and 195.8 °C, respectively. The specific-heat capacity of Zn(NH_3)_2(FOX-7)_2 was determined with a micro-DSC method, and the molar-heat capacity is 454.6 J mol~(-1) K~(-1) at 298.15 K. Adiabatic time-to-explosion was also estimated to be about 20 s. The thermal stability of Zn(NH_3)_2(FOX-7)_2 is good and higher than that of analogous Cu(NH_3)_2(FOX-7)_2.