The Evolution of Sensitivity in HMX-Based Explosives During the Reversion From Delta to Beta Phase

Can a shock-induced phonon up-pumping model relate to impact sensitivity of molecular crystals, polymorphs and cocrystals?

“…58 Pristine b-HMX was transformed to d-HMX and then reverted. Concatenating the recent results 57 with previous studies, 27,59 a trend rather appears, as shown in Table 2. The smaller the initial particle size of pristine b, the less sensitive reverted-b is.…”

Phase Retransformation and Void Evolution of Previously Heated HMX-Based Plastic-Bonded Explosive in Wet Air

“…These phenomena indicate that the stability of the hydrate phase of nitroamino explosives depends on the degree of hydration. The final products of δ-HMX conversion were found to be β-HMX at RT and 95–98% RH . Although it was undetectable, the increase in RH might promote the phase transformation from δ-HMX to γ-HMX and then reconstruct to stable β-HMX at RT.…”

“…The final products of δ-HMX conversion were found to be β-HMX at RT and 95−98% RH. 37 Although it was undetectable, the increase in RH might promote the phase transformation from δ-HMX to γ-HMX and then reconstruct to stable β-HMX at RT. Otherwise, δ-HMX might be directly converted into β-HMX as it seemed kinetically much easier than the γ ↔ β transition.…”