Thermochemical and Energy Characteristics of Alcoxy-NNO-Azoxy Derivatives of Pyrazoles and Nitropyrazoles
I. N. Zyuzin1, A. I. Kazakov1, D. B. Lempert1, I. A. Vatsadze2, L. S. Kurochkina1, A. V. Nabatova1
1Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia
2Zelinsky Institute of Organic Chemistry, Russian Academybof Sciences, Moscow, 119991 Russia
Keywords: 1-(2,2-бис(метокси-NNO-азокси)этил)-пиразол, 1-(2,2-бис(метокси-NNO-азокси)этил)-3-нитропиразол, 1-(2,2-бис(метокси-NNO-азокси)этил)-4-нитропиразол, алкокси-NNO-азоксисоединения, пиразолы, нитропиразолы, энтальпия сгорания, энтальпия образования, смесевые твердые ракетные топлива, удельный импульс, 1-(2,2,2-bis(methoxy-NNO-azoxy)ethyl)-pyrazole, 1-(2,2-bis(methoxy-NNO-azoxy)ethyl)-3-niropyrazole, 1-(2,2-bis(methoxy-NNO-azoxy)ethyl)-4-niropyrazole, alkoxy-NNO-azoxy compounds, pyrazoles, nitropyrazoles, enthalpy of combustion, enthalpy of formation, solid composite propellants, specific impulse
Abstract
The standard enthalpies of formation of the compounds 1-(2,2-bis(methoxy-NNO-azoxy)ethyl)pyrazole, 1-(2,2-bis(methoxy-NNO-azoxy)ethyl)-3-nitropyrazole, and 1-(2,2-bis(methoxy-NNO-azoxy)ethyl)-4-nitropyrazole were measured experimentally to be 273.6 ± 6.7, 231.0 ± 3.3 and 213.8 ± 7.9 kJ/mol, respectively. These enthalpy values were used to determine the contribution of the replacement of H atoms at N atoms in heterocycles by CH2CH(N2O2Me)2 groups (151.9 kJ/mol). Calculations have shown that compared to HMX, 1-(2,2-bis(methoxy-NNO-azoxy)ethyl derivatives of pyrazole, 3- and 4-nitropyrazole, 3,4-diniteopyrazole, 3,4,5-ttrinitropyrazole, the bis-derivative bis-furazano[3,4-b;3',4'-e] piperazine are worse gasifying components of solid composite propellants in metal-free compositions with an active binder. Only the derivative 3,4-dinitropyrazole, which at low content and combined with ammonium perchlorate provides a specific impulse of 249 s in aluminum-free propellant compositions. Key
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