Thermal stability test method of energetic materials based on electrical conductivity

Thermal stability is a crucial parameter for evaluating the stability of energetic materials. In order to make up for the shortcomings of the existing evaluation methods of thermal stability of energetic materials, a new method for evaluating the thermal stability of energetic materials based on the change of conductivity was proposed. After heating the energetic material, the decomposition gas product is dissolved in the absorption solution, and the change value of the conductivity before and after the absorption gas is tested to evaluate the thermal stability of the energetic material. More than ten kinds of energetic material systems such as 2,4,6-trinitrotoluene(TNT), hexamethylenetetramine (HMX), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), hexanitrohexaziguanine (CL-20), triaminotriazine (TATB), hexanitrostilbene (HATO), 1,1-diamino-2,2-dinitroethylene(FOX-7), trinitrotoluene (DNTF), Nitrocellulose (NC), 2,4,6-trinitrophenol (PETN), dinitroanthracene (DINA) and pentanedioylmonoimide (PNIMMO) were tested. It is found that the results based on conductivity test are consistent with the results of traditional standard methods(vacuum stability test, differential scanning calorimetry test), which proves the feasibility of the method. Key parameters such as the type of absorbing solution, detection electrodes, sample mass, and test temperature were investigated and optimized. The newly developed method requires only milligram-scale quantities of material for heating tests, enabling real-time monitoring of the conductivity change curve of the absorption solution and facilitating efficient thermal stability assessment.