Pyrolysis behavior and mechanism of high nitrogen compound 4,4′,6,6′-tetra(azido)-hydrazine-1,3,5-triazine
Ruimin Tang, Chen Wang, Mao-guo Zhu, Lihong Sun, Jianxing Yang, Suhang Chen, Fengqi Zhao, Kang Xu
Abstract
The pyrolysis behavior and mechanism of energetic materials are crucial for assessing their safety and application. In this study, the pyrolysis behavior, gas-phase decomposition products, condensate phase products and pyrolysis mechanism of high nitrogen compound 4,4′,6,6′-tetri(azide)-hydrazine-1,3,5-triazine (TAHT) were fully studied through differential scanning calorimetry (DSC), thermogravimetric analysis (TG), thermogravimetric-infrared-mass spectrometry (TG-IR-MS) and in-situ infrared spectroscopy. The results indicate that the thermal behavior of TAHT exhibits a big exothermic decomposition process and an endothermic decomposition process accompanied by the mass loss of 42.5 % and 52.1 %, respectively. At the heating rate of 10 °C·min −1 , the peak temperature ( T p ) and decomposition enthalpy of exothermic decomposition process are 230.4 °C and −2021.0 J g −1 , respectively. The peak temperature ( T p ) of endothermic decomposition process is 703.5 °C. In the exothermic decomposition stage, the main gas-phase decomposition products of TAHT are N 2, and contain small amounts of NH 3 and HCN, the hydrazine bond and azide groups in the condensed-phase almost completely disappear during the pyrolysis process, and the residues form a network structure of triazine ring. Based on the analysis of gas-phase and condensed-phase products, a possible pyrolysis mechanism for TAHT is proposed. This work provides valuable theoretical insights for the application of TAHT as a new green energetic material. The thermal decomposition characteristics and mechanisms of high-nitrogen compound 4,4′,6,6′-tetra(azide)-hydrazine-1,3,5-triazine (TAHT) were systematically investigated using DSC, TG, TG-IR-MS, and in situ FTIR. The thermal behavior of TAHT exhibits a big exothermic decomposition process and an endothermic decomposition process accompanied. In the exothermic decomposition stage, the main gas-phase products of TAHT is N 2, and contains small amounts of NH 3 and HCN, the hydrazine bond and azide groups in the condensed-phase gradually disappear, and the residues form a network structure of triazine ring. The pyrolysis mechanism for TAHT is proposed. • The thermal decomposition behavior of TAHT has been systematically studied. • The main gas-phase decomposition product of TAHT is N 2 , also including small amounts of NH 3 and HCN. • The pyrolysis mechanism of TAHT has been proposed.