Synergistic Catalytic Effect of a Series of Energetic Coordination Compounds based on Tetrazole‐1‐acetic Acid on Thermal Decomposition of HMX

Abstract

A series of energetic coordination compounds [Co(tza)2}n (1), [Bi(tza)3]n (2), {[Cu4(tza)6(OH)2]·4H2O}n (3), [Mn(tza)2]n (4), {[Bi(tza)(C2O4)(H2O)]·H2O}n (5) and [Fe3O(tza)6(H2O)3]NO3 (6) based on tetrazole‐1‐acetic acid (Htza) were synthesized though environmentally friendly methods. The coordination compounds were characterized by elemental analyses, IR spectroscopy, single‐crystal and powder X‐ray diffraction (PXRD), thermogravimetric analyses (TG), and differential scanning calorimetry (DSC). Their catalytic performances and the synergetic catalytic effects between 1 and 2, 3 and 4, 5 and 6 on the thermal decomposition of octahydro‐1,3,5,7‐tetranitro‐1,3,5,7‐tetrazocine (HMX) were all investigated by DSC. The results revealed that compounds 1–6 are thermally stable energetic compounds and they all exhibit high catalytic action for HMX thermal decomposition. The catalytic effects of the compounds on HMX thermal decomposition are closely related to the oxides, which come from the decomposition of the compounds, but have no positive relationships with the heat releases of the compounds themselves. Moreover, the synergetic catalytic effects between 1 and 2, 3 and 4, 5 and 6 were observed. Their mixtures at different mass ratio have different synergetic catalytic effects, and the sequence of the biggest synergetic index (SI) in each system is copper‐manganese system (compounds 3 and 4) > iron‐bismuth system (compounds 5 and 6) > cobalt‐bismuth system (compounds 1 and 2), indicating that the synergistic catalytic effects are mainly related to the combination and the proportion of the compounds.