2,4,6,8,10,12-六硝基-2,4,6,8,10,12-六氮杂亚硫酸酯(CL-20)是高能氧化剂之一,但由于其高灵敏度而限制了应用。在这项工作中,聚偏氟乙烯(PVDF)用作助氧化剂,这有望提高CL-20的安全性。采用一种新型的石墨烯基碳酰肼配合物(GCCo和GCNi),通过喷雾干燥法改性双氧化剂CL-20@PVDF复合材料的性能,并与传统的纳米碳材料(CNTs和GO)进行比较。使用TGA/DSC技术和冲击试验研究了这些复合材料的性能。结果表明,GCCo和GCNi可以提高CL-20@PVDF复合材料的活化能(Ea),改变CL-20@PVDF的物理模型,依次是随机断链模型,然后是一阶反应模型。此外,这些纳米碳材料通过其独特的结构可以降低CL-20@PVDF的冲击敏感性。除此之外,采用双氧化剂CL-20@PVDF体系改善了硼的燃烧性能。与CNTs和GO相比,GCCo和GCNi的协同作用可以提高CL-20@PVDF@B的火焰温度并控制燃烧速率。高能纳米碳催化剂改性的氧化剂提供了一种简单的方法来稳定高能但敏感的材料以拓宽其应用。
2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) is one of the high-energy oxidants, but has limited application due to its high sensitivity. In this work, polyvinylidene fluoride (PVDF) was used as a co-oxidizer, which is expected to increase the safety of CL-20. One kind of novel graphene-based carbohydrazide complex (GCCo and GCNi) was employed to modify the properties of dual-oxidant CL-20@PVDF composites by the spray drying method and compared with traditional nanocarbon materials (CNTs and GO). The properties of these composites were investigated using the TGA/DSC technique and impact test. The results show that GCCo and GCNi could increase the activation energy (Ea) of CL-20@PVDF composites, and change the physical model of CL-20@PVDF, which followed the random chain scission model and then the first-order reaction model. In addition, these nanocarbon materials could reduce the impact sensitivity of CL-20@PVDF by their unique structure. Besides that, a dual-oxidant CL-20@PVDF system was used to improve the combustion property of Boron. GCCo and GCNi with the synergetic effect could increase the flame temperature and control the burn rate of CL-20@PVDF@B compared with CNTs and GO. The energetic nanocarbon catalyst-modified oxidant provides a facile method for stabilizing high-energy but sensitive materials to broaden their application.