Enhanced Thermal Decomposition and Safety of Spherical CL-20@MOF-199 Composites via Micro-Nanostructured Self-Assembly Regulation.
Enhanced Thermal Decomposition and Safety of Spherical CL-20@MOF-199 Composites via Micro-Nanostructured Self-Assembly Regulation.
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DOI：
10.1021/acsami.3c06732
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发表时间：
2023-08
影响因子：
9.5
通讯作者：
Hao Li;Wenchao Tong;Zhenzhan Yan;Long Li;Shuang Wang;Junda Huo;Li Yang;Jimin Han;Xiaoting Ren;Wei Li
中科院分区：
文献类型：
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作者：
Hao Li;Wenchao Tong;Zhenzhan Yan;Long Li;Shuang Wang;Junda Huo;Li Yang;Jimin Han;Xiaoting Ren;Wei Li
高燃速、高能量输出、低压力指数的特点一直是复合固体火箭推进剂领域的发展重点。本文以金属有机骨架化合物（MOF-199）为研究对象，采用喷雾干燥自组装技术制备CL-20@MOF-199微纳米复合材料。MOF-199作为一种有吸引力的燃烧催化剂和安全调节剂，均匀地涂覆在CL-20表面，颗粒之间界面接触紧密，有效地加速了CL-20的热分解，并确保了安全性能。平均非共价相互作用（aNCI）分析表明，CL-20与MOF-199之间存在较强的C-H···O氢键和货车范德华力，大大增强了粒子间的组装效果。讨论了不同含量的MOF-199对CL-20热性能、安全性能和能量性能的影响。热分析结果表明，MOF-199对CL-20具有明显的热催化作用，热分解峰温提前14.2 °C，活化能垒降低34.2 kJ·mol-1，这主要得益于其催化活性位暴露较多，界面接触紧密。此外，CL-20@M0F-199复合材料表现出降低的机械灵敏度（IS：21-40 cm，FS：80-240 N）和优异的能量性能。研究结果表明，MOF-199是CL-20的一种上级燃烧催化剂和良好的安全缓冲剂，为CL-20在复合固体推进剂中的进一步应用开辟了新的前景。
The characteristics of high burning rate, high energy output, and low pressure exponent have always been the focus of development in the field of composite solid rocket propellants. In this paper, a metal-organic framework (MOF-199) compound is introduced to prepare micro-nanospherical CL-20@MOF-199 composites via the spray-drying self-assembly technique to reach the above goals. MOF-199, which acts as an attractive combustion catalyst and a safety regulator, is uniformly coated on the surface of CL-20 with close interface contact between particles, effectively accelerating the thermal decomposition of CL-20 and ensuring safety performance. The average noncovalent interaction (aNCI) analysis illustrates that there are strong C-H···O hydrogen bonds and van der Waals interaction between CL-20 and MOF-199 molecules, greatly enhancing the effect of interparticle assembly. The effects of different contents of MOF-199 on the thermal, safety, and energy properties of CL-20 were discussed. The thermal analysis demonstrates that MOF-199 has a significant thermal catalytic effect on CL-20, with an advanced peak temperature of thermal decomposition of 14.2 °C and a reduced activation energy barrier of 34.2 kJ·mol-1, mainly benefitting from more exposed catalytic active sites and close interface contact. In addition, CL-20@MOF-199 composites exhibit decreased mechanical sensitivity (IS: 21-40 cm, FS: 80-240 N) and excellent energy performance. This work clearly demonstrates that MOF-199 is both a superior combustion catalyst and a good safety buffer for CL-20, and it opens new potential for further applications of CL-20 in composite solid propellants.