Abstract: Thermal decomposition and combustion of macrocyclic tetra(azofurazan), TATF, and tetra(azoxyfurazan), TOATF, were studied using a number of complementary experimental techniques, namely thermogravimetry, differential scanning calorimetry, manometry, microthermocouple measurements in a combustion wave. Kinetic studies of polyazo- and azoxyfurazans have demonstrated that macrocycles, TATF and TOATF, have a different mechanism of thermal decomposition than their linear counterparts. While linear azo- and azoxyfurazans have relatively low activation energy (130–143 ​kJ·mol−1) of thermal decomposition, the activation energies for macrocyclic TATF and TOATF are 202–210 ​kJ·mol−1, which is close to the calculated breaking energy of the C-NN bond. The initial stage of decomposition of these macrocycles is the monomolecular cleavage of the C-NN bond, while linear azofurazan decomposes according to a concerted mechanism, loss N2 or N2O molecules. It was found that the condensed-phase chemistry determines the combustion mechanism of TOATF. Combustion instability is observed for TATF in the pressure range below 3 ​MPa. Both macrocyclic TATF and TOATF are relatively fast-burning energetic compounds, with burning rates exceeding the burning rates of the CL-20.

Cite: Sinditskii V.P. , Burzhava A.V. , Sheremetev A.B.
Macrocyclic tetra(azo-) and tetra(azoxyfurazan)s: Comparative study of decomposition and combustion with linear analogs
Energetic Materials Frontiers. 2021. V.2. N2. P.87-95. DOI: 10.1016/j.enmf.2021.03.005 Scopus OpenAlex

Identifiers:

≡ Scopus:	2-s2.0-85116496930
≡ OpenAlex:	W3153092782

Altmetrics: