硝化石墨烯制备及对高氯酸铵热分解的催化作用

In order to improve the energy release and catalytic effects of graphene in energetic materials, a nitrified graphene oxide (NGO) was obtained by nitrifying a graphite oxide prepared by Hummers method. The prepared samples were analyzed by scanning electron microscopy, X-ray photoelectron spectroscopy, organic element analyzer, Fourier transform infrared spectroscopy and TG-DSC synchronous thermal analysis for strctural and performance analysis. Constant volume combustion test was used to probe the burning behavior of NGO in energetic system. The experimental results show that the prepared NGO is lamellar with wrinkles as a novel energetic catalyst. The nitrate group and the nitro group are suspended at the oxygen-containing functional group sites of graphene oxide, and the mass ratio of nitrate element is 8%. Exothermic enthalpy of NGO is around 659 J/g, and the thermal total weight loss is 47%. When 5% NGO is added into ammonium perchlorate (AP), the peak temperature in each decomposition step is lower, and the activation energy of AP in the first decomposition step decreases from 123.7 kJ/mol to 99.4 kJ/mol. Meanwhile the critical thermal explosion temperature decreases from 431℃ to 366℃. NGO is added to increase the reaction heat of AP-coated Al system and the peak pressure by 13% and 56%, respectively.