GUAN Tong, ZHANG Xiangrong, YUE Yuehui, et al. Hygroscopicities of 3,4-dinitropyrazole and Its Melt-cast Explosive[J/OL]. ACTA ARMAMENTARII, 2026, 1-10.
DOI:
GUAN Tong, ZHANG Xiangrong, YUE Yuehui, et al. Hygroscopicities of 3,4-dinitropyrazole and Its Melt-cast Explosive[J/OL]. ACTA ARMAMENTARII, 2026, 1-10.DOI: 10.12382/bgxb.2026.0025. CSTR: XXXXX.XX.XXX.2026.0025.
Hygroscopicities of 3,4-dinitropyrazole and Its Melt-cast Explosive
The hygroscopicity severely limits the engineering application of the novel melt-cast matrix 3,4-dinitropyrazole (DNP). In this work, the moisture absorption patterns and mechanisms of DNP and its melt-cast explosives under different temperatures and relative humidities, as well as the effect of moisture absorption on their mechanical properties, are systematically investigated through experimental test and molecular dynamics simulation. The results indicate that the hygroscopicities of DNP and its melt-cast explosives increase with the rise in temperature and relative humidity., The critical relative humidities are 85%, 62%, and 42%, respectively, at 25 °C, 40 °C and 55 °C. The DNP particles possess a developed porous surface structure. After the moisture is adsorbed via capillary condensation, the water molecules form hydrogen bonds with the N-H bonds and nitro groups of DNP molecules. This weakens the original intermolecular hydrogen-bond network and π-π stacking interactions within the DNP crystals, which leads to the sustained progression of the moisture absorption. Moisture absorption results in decreasing the bonding strength between DNP and particles. As the moisture content increases, the compressive strength and elastic modulus of DNP-based melt-cast explosives decrease, while the failure strain increases.
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