The effect of manganese (III) acetylacetonate nano coating on the mechanism of thermal decomposition of ammonium perchlorate

Nano-sized manganese (III) acetylacetonate (Mn(acac)3) was coated on the surface of ammonium perchlorate (AP) by sol-gel method, for reducing thermal decomposition temperature of AP. Analysis of thermal gravimetry (TG) results showed that manganese (III) acetylacetonate nano-coating has been converted to manganese spinel before the thermal decomposition of ammonium perchlorate and this nano-sized manganese spinel had a good catalytic effect on the thermal decomposition of ammonium perchlorate. In this paper, X-ray diffraction pattern (XRD) and scanning electron microscopic images (SEM) were used to prove the formation of nano-coating on the surface of ammonium perchlorate and identification nanocomposites, respectively. As well as, the catalytic effect of nano-sized manganese spinel resulted from manganese (III) acetylacetonate studied by the differential scanning calorimetry (DSC) and Thermogravimetric analysis (TG) on the thermal decomposition of ammonium perchlorate and thermal decomposition of nano composite Mn(acac)3/AP showed that decomposition peaks of ammonium perchlorate decreased from 422 ºC to 318 ºC and from 317 ºC to 279 ºC ,respectively. According to the reduction effect of the nano-sized coating on the decomposition peaks of AP, it has been revealed that nano-coating has a significant effect on the thermal decomposition of ammonium perchlorate and eventually improved the performance of solid propellants.