Effects of magnesium hydride on the thermal decomposition and combustion properties of DAP-4

Abstract

Ammonium perchlorate-based molecular perovskites (DAP-4) have garnered immense interest due to their exceptional burst performance and good thermal stability. Similarly, metallic hydrides are widely acknowledged as an exceedingly promising material class for implementation in energetic systems, given their exceptional hydrogen storage density. Therefore, it is crucial to investigate the impact of hydrogen storage material MgH2 on the thermal decomposition and combustion characteristics of molecular perovskite materials ((H2dabco)[NH4(ClO4)3],DAP-4). In this study, DAP-4/MgH2 composites were synthesized and characterized for their morphology, structure, elemental distribution, thermal decomposition properties, and combustion properties. The findings indicated that the inclusion of MgH2 reduce the thermal decomposition temperature of DAP-4. Moreover, when MgH2 was added at a mass ratio of 5 wt%, the apparent activation energy (Ea) decreased to 212.0 kJ/mol, while the peak combustion pressure and boosting rate increased with more intense flames. A plausible thermal decomposition and combustion mechanism of DAP-4/MgH2 composites was postulated. This study enhances our understanding of the thermal decomposition and combustion properties of DAP-4 and magnesium hydride in energy-containing systems.