چكيده به لاتين
In this research, by using top-down physical methods, RDX microscale energetic material with maximum 98 micron particle size, were converted to the nanoscale material (below 100 nm) through ultrasonic instruments. The results show microscale heterogeneous RDX sample is prepared via ultrasound probes by using optimized conditions as semi-spherical and uniform particle size. A-4 nanoscale energetic material has been prepared by adding wax to RDX nanoscale (containing 97wt% RDX nanoscale to 3wt% wax). The lifetime of nanoenergetic material is predicted by using DTA and TG analytical techniques in the various heating rates (2, 3, 4, 5, 6 and 8 ºC/min). The activation energy (Ea) of this energetic material was calculated from DTA and TG by means of Kissinger free-model methods that were near to 135.350 and 180.337 kJ/mol, respectively. The kinetic parameter results of TG and DTA were used for the estimation of lifetime by consideration of climatic conditions of Iran for transportation and storage. The chemical lifetime calculated for this explosive via fitting model in heating rate of 2 ºC/min and α=0.1 and 0.2 from DTA were obtained 8.476 and 16.341 years, respectively. The lifetime calculated for this explosive via fitting model in heating rate of 4 ºC/min and α=0.1 and 0.2 from DTA were obtained 6.029 and 8.389 years, respectively. The lifetime of this energetic materials by Vyazovkine model-free method from DTA in heating rate of 2 and 4 ºC/min and α=0.1 were obtained 21.825 and 10.913 years, respectively. The chemical lifetime of A-4 nanoscale energetic material by using fitting model in heating rate of 2 ºC/min, α=0.1 and α=0.2 from TGA were obtained 754.043 and 2192.210 years, respectively. The lifetime of this explosives via fitting model in heating rate of 4 ºC/min, α=0.1 and α=0.2 from TGA were obtained 536.346 and 1125.500 years, respectively.
