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Macrocyclic tetra(azo-) and tetra(azoxyfurazan)s: Comparative study of decomposition and combustion with linear analogs
Energetic Materials Frontiers Pub Date : 2021-04-15 , DOI: 10.1016/j.enmf.2021.03.005
V.P. Sinditskii , A.V. Burzhava , A.B. Sheremetev

Thermal decomposition and combustion of macrocyclic tetra(azofurazan), TATF, and tetra(azoxyfurazan), TOATF, were studied using a number of complementary experimental techniques, namely thermogravimetry, differential scanning calorimetry, manometry, microthermocouple measurements in a combustion wave. Kinetic studies of polyazo- and azoxyfurazans have demonstrated that macrocycles, TATF and TOATF, have a different mechanism of thermal decomposition than their linear counterparts. While linear azo- and azoxyfurazans have relatively low activation energy (130–143 ​kJ·mol−1) of thermal decomposition, the activation energies for macrocyclic TATF and TOATF are 202–210 ​kJ·mol−1, which is close to the calculated breaking energy of the C-NN bond. The initial stage of decomposition of these macrocycles is the monomolecular cleavage of the C-NN bond, while linear azofurazan decomposes according to a concerted mechanism, loss N2 or N2O molecules. It was found that the condensed-phase chemistry determines the combustion mechanism of TOATF. Combustion instability is observed for TATF in the pressure range below 3 ​MPa. Both macrocyclic TATF and TOATF are relatively fast-burning energetic compounds, with burning rates exceeding the burning rates of the CL-20.



中文翻译:

大环(偶氮)和(azoxyfurazan)S:比较分解和燃烧用直链的类似物的研究

使用许多互补的实验技术,即热重法、差示扫描量热法、测压法、燃烧波中的微热电偶测量,研究了大环四(偶氮呋喃)TATF 和四(偶氮呋咱)TOATF 的热分解和燃烧。多偶氮和偶氮呋喃的动力学研究表明,大环 TATF 和 TOATF 具有与其线性对应物不同的热分解机制。虽然线性偶氮和偶氮呋喃具有相对较低的热分解活化能 (130–143 kJ·mol -1 ),但大环 TATF 和 TOATF 的活化能为 202–210 kJ·mol -1,这接近计算的 C-NN 键断裂能。这些大环分解的初始阶段是 C-NN 键的单分子裂解,而线性偶氮呋喃则根据协同机制分解,即失去 N 2或 N 2 O 分子。发现凝聚相化学决定了TOATF的燃烧机理。在低于 3 MPa 的压力范围内观察到 TATF 的燃烧不稳定性。大环 TATF 和 TOATF 都是燃烧速度相对较快的高能化合物,燃烧速度超过 CL-20 的燃烧速度。

更新日期:2021-04-15
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