Low-sensitivity but high-energy layered HMX crystals have been prepared by using an in-situ crosslinked network as the templated confinement, following a solvent-antisolvent procedure. The as received layered-HMX (L-HMX) crystals have only three diffraction peaks at 13.8°, 28.0° and 42.6°. It reveals that the conformation of the HMX molecule was largely changed after the squeezing and templating effect of the high nitrogen layers. The endothermic peak was not observed prior to decomposition, as the polymorphic transition and melting processes were excluded. This suggests that a new phase of HMX has been achieved. Unexpectedly, the L-HMX also shows significant fluorescent properties with incident laser wavelength of less than 932 nm. L-HMX has a calculated VoD value of 9425 km·s and a calculated value of 41.5 GPa even 5 % higher than that of pure HMX. It is worth mentioning that the mechanical sensitivity of L-HMX crystals has been significantly reduced, and the excitation energy required for impact initiation is greater than 50 J, whereas that of pure HMX is about 6 J. The friction sensitivity is greater than 200 N. This approach may offer an efficient means to significantly enhance mechanical and thermal safety performance, while still maintaining a high energy level.

中文翻译：

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以原位生成的二维交联大分子为模板，具有改进的热稳定性的高能分​​子的分层组装

通过使用原位交联网络作为模板限制，遵循溶剂-反溶剂程序，制备了低灵敏度但高能量的层状 HMX 晶体。收到的层状 HMX (L-HMX) 晶体仅在 13.8°、28.0° 和 42.6° 处具有三个衍射峰。结果表明，经过高氮层的挤压和模板作用后，HMX分子的构象发生了很大的变化。由于排除了多晶型转变和熔化过程，因此在分解之前未观察到吸热峰。这表明 HMX 已经达到了一个新阶段。出乎意料的是，L-HMX 还表现出显着的荧光特性，入射激光波长小于 932 nm。 L-HMX的计算VoD值为9425 km·s，计算值为41.5 GPa，比纯HMX高出5%。值得一提的是，L-HMX晶体的机械敏感性显着降低，冲击引发所需的激发能大于50 J，而纯HMX约为6 J。摩擦敏感性大于200 N这种方法可以提供一种有效的方法来显着增强机械和热安全性能，同时仍然保持高能量水平。