Features of thermal decomposition of some explosive on the surface of porous carriers

摘要

The influence of the surface of some porous carriers with specific surface from 5 to 650 m~2/g on the decomposition of RDX and PETN was studied by the method of differential scanning calorimetry and manometric method. Endotherms corresponding to melting of RDX and PETN were observed for carriers with low specific surface less than 10 m~2/g. But they were absent for carriers with high specific surface more than 40 m~2/g, that was explained by increased surface adsorption of the substance. The onset of decomposition and exotherms of RDX and PETN on the carriers with high specific surface were lower than on the carriers with low specific surface. The decrease at the temperature of the maximum heat flow was observed to be up to ～ 20 °C. The significant growth of the initial rate of decomposition of RDX on the surface of carriers is accompanied with reduction of auto-catalytic acceleration of decomposition and it becomes lower with high specific surface carrier. The decomposition of RDX and PETN takes place in the adsorption layer, which have a structure of two-dimensional associated Van-der-Waals gas.