海胆状纳米 MnO2的制备及其对 CL-20热分解性能的影响

摘要

采用水热法合成海胆状纳米 MnO2颗粒，用 X 射线粉末衍射（XRD）和扫描电子显微镜及 X 射线能谱分析（SEM-EDS）对该 MnO2颗粒进行物相组成及结构表征；用固体研磨法制备出质量比为1∶2、1∶5和1∶9的纳米MnO2／CL-20混合物；用差示扫描量热（DSC）法考察了纳米 MnO2对 CL-20热分解性能的影响。结果表明，纳米MnO2的加入不会改变 CL-20热分解过程的最可几机理函数；加入纳米 MnO2后，MnO2／CL-20混合物的热分解峰温明显降低；与 CL-20相比，不同质量比的 MnO2／CL-20混合物表观活化能降低，表明海胆状纳米 MnO2可以促进CL-20的热分解。%Sea urchin-shaped nano-MnO2 particles were synthesized using hydrothermal method. The phase composition and structure of MnO2 particles were characterized using X-ray diffraction (XRD)and scanning electron microscope-energy dispersive spectrometry (SEM-EDS).MnO2/CL-20 composites were prepared by grinding the mixture of nano-MnO2 and CL-20 with the mass ratio of 1∶2,1∶5 and 1∶9.The effect of nano-MnO2 particles on the thermal decomposition performance of CL-20 was studied by differential scanning calorimetry (DSC).The results indicate that nano-MnO2 does not change the most probable mechanism function of the thermal decomposition process of CL-20.The thermal decomposition peak temperature of CL-20 significantly decreases with the addition of nano-MnO2 .Compared with pure CL-20,the apparent activation energy of MnO2/CL-20 mixture with different mass ratios reduces,indicating that the sea urchin-shaped nano-MnO2 can accelerate the thermal decomposition of CL-20.