Synthesis, Thermal Stability And Combustion Catalytic Properties Of Ferrocene-based Nitrogen-containing Heterocyclic Compounds

Ferrocene and its derivatives are widely used in burning rate catalysts and have excellent catalytic performance.However,during long-term storage,the phenomenon of migration and volatilization leads to a decrease in the overall performance of the propellant.In order to improve and enhance the comprehensive performance of ferrocene-based derivatives as combustion rate catalysts in AP,triazole,tetrazole,and tetrazine were linked with ferrocene in this paper to construct active new ferrocene-based burn rate cataiysts with good thermal stability.(1)16 kinds of ferrocene-based compounds,including six dinuclear ferrocene compounds are prepared by reacting ferrocene formaldehyde,ferrocene formic acid or ferrocene formyl chloride with nitrogen heterocyclic compounds(triazole,tetrazolium,tetrazine)through different synthetic methods.Nitrogen heterocyclic compounds,including six dinuclear ferrocene compounds.Due to the high reactivity of ferrocenecarbonyl chloride,there are multiple reaction sites during the reaction with nitrogen-containing heterocycles,and the reaction conditions are controlled to obtain ferrocene compounds with different substitution positions.The structures of compounds were characterized by nuclear magnetic resonance,high-resolution mass spectrometry,X-single crystal diffraction and other means.(2)The comprehensive properties of the synthesized ferrocene-based nitrogen-containing heterocyclic compounds were test.The cyclic voltammetry test results show that the peak potential difference of the synthesized compounds is greater than 80 m V,indicating that the synthesized compounds do not have complete redox reversibility and have a certain degree of oxidation resistance;thermogravimetric analysis test results show that the initial thermal decomposition temperatures of ferrocene-based compounds with triazole,tetrazole and tetrazine are around 200 °C,the thermal decomposition temperature of dinuclear ferrocene-based compounds are between 240-380 °C,indicating that the dinuclear ferrocene-based compounds have higher thermal stability.The exothermic peaks were advanced to different degrees.The ferrocene tetrazine compound with the highest nitrogen content significantly advanced the peak temperature of pure AP,but its decomposition was slow and the exothermic range was large.Compared with tetrazine compounds,ferrocene-based tetrazolium compounds are more exothermic.Among them,dinuclear ferrocene-based nitrogen-containing heterocyclic compounds combine two exothermic peaks into one main peak,with concentrated exothermic heat and small exothermic interval.