Abstract
Highly energetic nitramines such as cyclotetramethylene-tetranitramine (HMX) experience high combustion enthalpy, as well as large volume of gaseous products. Despite the fact that HMX can expose high thermal stability, it exposes low sensitivity to different catalysts. HMX-based propellants will combust at low burning rate. Ferric oxide particles with hydrous surface can offer high catalyzing ability via release of active .OH radicals; active .OH species would attack heterocyclic ring with hydrogen atom abstraction. Highly crystalline, monodispersed Fe2O3 nanoparticles (NPs) of 3.39 nm average particle sizes were developed using hydrothermal processing. Fe2O3NPs were integrated into HMX via co-precipitation technique. The impact of Fe2O3NPs (1 wt%) on HMX thermolysis was investigated using differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Fe2O3NPs demonstrated advanced catalytic performance. HMX main exothermic decomposition peak was decreased by 13.0 °C with an increase in decomposition enthalpy by 72.2%. Fe2O3NPs could alter HMX thermolysis from C–N cleavage to hydrogen atom abstraction through the released active surface .OH radical. Additionally released NO2 could be adsorbed on nanocatalyst surface offering high decomposition enthalpy.
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