The effects of TiH₂ on the thermal decomposition performances of ammonium perchlorate-based molecular perovskite (DAP-4)

In order to promote the development of molecular perovskite energetic materials, studying thermal decomposition performances of AP-based molecular perovskite energetic materials ((H₂dabco)[NH₄(ClO₄)₃], DAP-4) catalyzed by metal hydrogen storage fuel is significant. In this study, the morphology, structure and thermal decomposition characteristics of TiH₂, DAP-4 and DAP-4/TiH₂ composite materials were characterized and investigated. The experimental results showed that the DAP-4 peak exothermic temperature at different heating rates both showed a decreasing trend with TiH₂ content increased. With 20 wt% TiH₂ added, the DAP-4 peak exothermic temperature decreased from 394.3 ℃ to 352.8 ℃ (10 ℃/min heating rate), and the apparent activation energy (E_a) also decreased from 201.5 KJ/mol to 182.3 KJ/mol. A possible catalytic thermal decomposition mechanism of perovskite catalyzed by TiH₂ was proposed. This work is helpful to further understand the thermal decomposition characteristics of molecular perovskite energetic materials in the presence of metal hydrides.