Thermal pyrolysis properties and security performance of molecular perovskite energetic crystal (C6N2H14) (NH4) (ClO4)3 (DAP-4)

DAP-4 (C6N2H14) (NH4) (ClO4)3 has been synthesized recently as an ammonium perchlorate-based molecular perovskite energetic material with higher stability and outstanding performances. In this study, rapid thermal cracking infrared spectroscopy is applied to study the thermal pyrolysis properties and combustion process of DAP-4. Under different temperatures and pressure with a heating rate of 1000 degrees C center dot s- 1, the gaseous products in the rapid pyrolysis process are mainly CO, CO2, H2CO, HCN, and HCl. Above 700oC, the pressure affects the ratio of the gas products, but the temperature does not. Based on the relative ratio of the different gas products, a thermal pyrolysis mechanism was proposed. The heat of explosion (Delta Hdet), enthalpy of combustion(Delta cH theta), and standard enthalpies of formation (Delta fH theta) are determined to be -2527.39 kJ center dot mol-1, -2492.06 kJ center dot mol-1 and -483.96 kJ center dot mol-1, respectively. The self-catalytic heating time is 99.5 min, the temperature at the initial detection point is 280.1 degrees C, and the maximum temperature rise rate is 49.1 degrees C center dot min- 1. The thermal safety experimental results showed that DAP-4 has a relatively good security performance. This study provides new insight into the mechanism of pyrolysis of DAP-4 as a potential energetic material.