Synthesis And Combustion Catalytic Properties Of Ferrocene Triazole/tetrazole Energetic Compounds

Ferrocene derivatives can release catalytically active Fe₂O₃ during combustion,so it can be used as a combustion catalyst for solid propellants.Although ferrocene derivatives have good combustion catalytic performance,there are still some disadvantages,such as the easy migration and volatility,which significantly reduce the combustion and storage stability of solid propellants,resulting in the service life of composite propellants short.In order to solve these problems,in this work,ferrocene group and triazole or tetrazole are connected to construct ferrocene energetic compounds with the advantages of high energy,high density and good thermal stability.Design and synthesis of ten ferrocene energetic compounds,the structures of these compounds were characterized by X-single crystal diffraction,NMR,high-resolution mass spectrometry,and IR and UV-Vis spectra.The main contents are as follows:（1）The corresponding imine compounds were prepared by using ferrocene formaldehyde and amino nitrogen heterocycle as raw materials,and then reduced by Na BH₄,the C=N bond was reduced to C-N bond,and the ferrocene energetic compounds were synthesized.The thermal stability of the compounds were evaluated by thermogravimetric analysis（TG）,and the thermal decomposition temperature can reach above 200°C,indicating that these compounds have good thermal stability;The antioxidant properties of the compounds were studied by cyclic voltammetry（CV）and differential pulse voltammetry（DPV）,the redoxΔE_P values of these compounds range from 95 to 153 m V,indicating that these compounds are not easily oxidized and have good antioxidant properties;Differential scanning calorimetry（DSC）test showed that the addition of these six ferrocene energetic compounds to AP（ammonium perchlorate）had little effect on the crystal transition temperature of AP,but advanced the low temperature exothermic peak and high temperature exothermic peak.of AP to varying degrees.（2）Also using ferrocene formaldehyde and amino nitrogen heterocycle as raw materials,four binuclear ferrocene energetic compounds were designed and synthesized.The preparation method was similar.Under acidic and heated conditions,nitrogen heterocycles tend to undergo a leaving reaction.Based on this finding,the reaction conditions were investigated.The TG results showed that the thermal decomposition temperature of these four compounds are higher than 240°C,and the increase of the amount of ferrocene improves the thermal stability of the compounds;The CV and DPV test results showed that theΔE_P values of these compounds are all above 110 m V,indicating that the anti-oxidative properties of the compounds are better;The thermal decomposition catalytic effects of these four compounds on AP were evaluated by DSC technology,and compared with the corresponding energetic compounds containing one ferrocene,the heat release reaches more than 1900 J/g,and it contains two ferrocenes,which can release more nano-scale Fe₂O₃,so these compounds have better and more significant catalytic effect on solid propellants.