Jiang Hanyu, Wang Xuanjun, Yu Jin, Zhou Wenjun, Zhao Shuangfei, Xu Siyu, Zhao Fengqi
Missile Engineering College, Rocket Force University of Engineering, Xi'an 710025, China.
Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
Nanomaterials (Basel). 2023 Jan 23;13(3):464. doi: 10.3390/nano13030464.
The crystal structure has a great influence on mechanical sensitivity and detonation performance of energetic materials. An efficient microfluidic platform was applied for size, morphology, and crystallinity controllable preparation of ultrafine HMX. The microfluidic platform has good mixing performance, quick response, and less reagent consumption. The ultrafine γ-HMX was first prepared at room temperature by microfluidic strategy, and the crystal type can be controlled accurately by adjusting the process parameters. With the increase in flow ratio, the particle size decreases gradually, and the crystal type changed from β-HMX to γ-HMX. Thermal behavior of ultrafine HMX shows that γ→δ is easier than β→δ, and the phase stability of HMX is β > γ > δ. Furthermore, the ultrafine β-HMX has higher thermal stability and energy release efficiency than that of raw HMX. The ultrafine HMX prepared by microfluidic not only has uniform morphology and narrow particle size distribution, but also exhibits high density and low sensitivity. This study provides a safe, facile, and efficient way of controlling particle size, morphology, and crystallinity of ultrafine HMX.
晶体结构对含能材料的机械感度和爆轰性能有很大影响。一种高效的微流控平台被应用于尺寸、形貌和结晶度可控的超细HMX的制备。该微流控平台具有良好的混合性能、快速响应和较少的试剂消耗。通过微流控策略首次在室温下制备出超细γ-HMX，并且通过调整工艺参数可以精确控制晶体类型。随着流速比的增加，粒径逐渐减小，晶体类型从β-HMX转变为γ-HMX。超细HMX的热行为表明γ→δ比β→δ更容易，且HMX的相稳定性为β > γ > δ。此外，超细β-HMX比原料HMX具有更高的热稳定性和能量释放效率。通过微流控制备的超细HMX不仅具有均匀的形貌和窄的粒径分布，而且表现出高密度和低感度。本研究提供了一种安全、简便且高效的控制超细HMX粒径、形貌和结晶度的方法。
