LEMPERT David B. , DALINGER Igor L., SHU Yuan-jie, KAZAKOV Anatolii I., SHEREMETEV Aleksei B.
The experimental values of the enthalpy of formation of two isomeric 3,4- and 3,5-dinitro-1-(trinitromethyl)-1H-pyrazoles have been obtained (261.5±5.0 and 246.4±6.7 kJ/mol for crystalline 3,4- and 3,5-dinitro-1-(trinitromethyl)-1H-pyrazoles, respectively). The ballistic effectiveness of these potential oxidizers in composite solid propellants was studied. It is shown that these two oxidizers may be successfully applied in metal-free compositions or with a small content of metal. For the bottom stage 3,4-dinitro-1-(trinitromethyl)-1H-pyrazole is a bit better than 3,5-dinitro-1-( trinitromethyl)-1H-pyrazole, for the upper stage the both oxidizers show the equal ballistic parameters. These oxidizers allow to create metalfree solid composite propellants with the binder percentage not lower than 19% (volume fraction), with Isp equal to 256.5-2570s at density equal to 1.72-1.74g/cm3.