金属有机配合物Mg(Salen)和Pb(Salen)对HMX的催化分解作用和机理

Catalytic Effects and Mechanisms of Metal-organic Complexes Mg(Salen)and Pb(Salen)on the Thermal Decomposition of HMX

开发新型燃烧催化剂对提高推进剂燃烧性能至关重要。成功合成了2种席夫碱金属有机配合物Mg(Salen)和Pb(Salen),并采用X射线粉末衍射、红外光谱以及扫描电镜对其形貌与结构进行了表征。通过探索其热分解行为以及分解反应动力学函数模型考察了其对HMX热分解行为的影响与分解机理。结果表明,Mg(Salen)和Pb(Salen)的加入显著促进了HMX的热分解行为,但未改变其分解机理。相比于HMX,HMX/Mg(Salen)和HMX/Pb(Salen)的分解峰温分别降低了3.0℃和34.0℃,表观活化能分别降低了7.7 k J·mol^(-1)和34.4 k J·mol^(-1)。通过建立分解反应动力学函数模型,初步揭示了Mg(Salen)和Pb(Salen)对HMX的催化分解机理。

The development of new combustion catalysts plays a key role in high performance propellants.Herein,the metal-organic complexes Mg(Salen)and Pb(Salen)were synthesized and characterized using X-ray diffraction,fourier transform infrared,and scanning electron microscope.Their catalytic effects on the thermal decomposition of 1,3,5,7-tetranitro-1,3,5,7-tetrazolidine(HMX)were further investigated by differential scanning calorimetry.The results indicate that the thermal decomposition of HMX is evidently enhanced by the introduction of Mg(Salen)and Pb(Salen).Compared with HMX,the decomposition peak temperatures of HMX/Mg(Salen)and HMX/Pb(Salen)dropped by 3.0℃and 34.0℃,and theoretical apparent activation energies decreased by 7.7 k J·mol^(-1)and 34.4 k J·mol^(-1),respectively.The catalytic decomposition mechanisms of Mg(Salen)and Pb(Salen)are also elucidated by exploring the decomposition kinetics and the reaction function models.