中北大学李小东团队报道了旋转蒸发法制备FOX-7/HMX复合晶体的形貌控制及晶体结构与性能分析。相关研究成果发表在2025年1月21日出版的《颗粒学报》。

提高高能炸药（EM）的安全性对于在储存、运输和使用过程中安全处理高能材料至关重要。复合多种高能材料有效地提高了炸药的不敏感性。

该研究以N，N-二甲基甲酰胺（DMF）为溶剂，采用旋转蒸发法制备了1,1-二氨基-2,2-二硝基乙烯/1,3,5,7-四硝基-1,3,5,7-四氮杂环辛烷（FOX-7/HMX）复合晶体。通过改变FOX-7和HMX的摩尔比，研究了它们对复合晶体形态的影响，并分析了复合晶体的形成机理。该研究对复合晶体的晶体结构、热分解、蒸煮性能和冲击敏感性进行了表征和测试。

结果表明，在FOX-7与HMX的摩尔比为5:5时，化合物程度为90.79%，FOX-7均匀地附着在HMX晶体的表面。FT-IR和XRD图谱分析显示，复合晶体的吸收峰和XRD曲线的特征峰发生了变化。FOX-7晶体嵌入HMX晶体的表面，形成共晶层并改变晶体结构。差示扫描量热法测试表明，FOX-7/HMX复合晶体的热分解温度比生FOX-7高1.77°C，在蒸煮试验中，复合晶体反应水平为燃烧，同时特征落差增加到62.6 cm，表明热稳定性和冲击安全性得到提高。

附：英文原文

Title: Morphology control and crystal structure and properties analysis of FOX-7/HMX composite crystals prepared by rotary evaporation method

Author: Xiaodong Li

Issue&Volume: 2025/01/21

Abstract: Enhancing the safety of high-energy explosives (EMs) is crucial for the secure handling of energetic materials during storage, transportation, and use. Compositing multiple energetic materials effectively enhances the insensitivity of explosives. This study used N,N-dimethylformamide (DMF) as a solvent in the rotary evaporation method to prepare 1,1-diamino-2,2-dinitroethene/1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (FOX-7/HMX) composite crystals. By varying the molar ratios of FOX-7 and HMX, this study investigated their effects on the morphology of the composite crystals, and the formation mechanism of the composite crystal was analyzed. The study characterized and tested the crystal structure, thermal decomposition, cook-off performance, and impact sensitivity of the composite crystal. The results indicate that at a 5:5 molar ratio of FOX-7 to HMX, the compound degree is 90.79%, and FOX-7 exhibits uniform adhering to the surface of the HMX crystal. FT-IR and XRD patterns analyses revealed shifts in the absorption peak of the composite crystal and the characteristic peak of the XRD curve. FOX-7 crystals were embedded on the surface of HMX crystals, forming a co- crystal layer and altering the crystal structure. Differential scanning calorimetry tests demonstrate that the thermal decomposition temperature of FOX-7/HMX composite crystals is 1.77 °C higher than the raw FOX-7, and during the cook-off test, the composite crystal reaction level is combustion, accompanied by an increase in characteristic drop height to 62.6 cm, indicating improved thermal stability and impact safety.

DOI: 10.1016/j.partic.2025.01.004

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200125000148