Nonisothermal decomposition kinetics, specific heat capacity, and adiabatic time-to-explosion of Zn(NH3)2(FOX-7)2

Abstract

A new energetic zinc-FOX-7 complex, Zn(NH3)2(FOX-7)2 (FOX-7 = 1,1-diamino-2,2-dinitroethylene), was first synthesized. Thermal decomposition behavior and nonisothermal decomposition kinetics of Zn(NH3)2(FOX-7)2 were studied with DSC and TG/DTG methods. The kinetic equation obtained is $$ \frac{{{\text{d}}\alpha }}{{{\text{d}}T}} = \frac{{10^{13.99} }}{\beta }4(1 - \alpha )[ - \ln (1 - \alpha )]^{{{3 \mathord{\left/ {\vphantom {3 4}} \right. \kern-0pt} 4}}} \exp ( - 1.448 \times 10^{5} /RT) $$ . The self-accelerating 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(NH3)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(NH3)2(FOX-7)2 is good and higher than that of analogous Cu(NH3)2(FOX-7)2.