2,4,6-三氨基-3,5-二硝基吡啶-1-氧化物及其造型粉的热分解动力学

Thermal Decomposition Kinetics of 2,4,6-Triamino-3,5-dinitropyridine-1-oxide and Its Moulding Powders

采用TG方法研究了2,4,6-三氨基-3,5-二硝基吡啶-1-氧化物(TNPyO)及其造型粉在升温速率分别为5、10、15、20K/min的热分解过程,用非线性等转化率积分法(NL-INT)和Ozawa法计算了TNPyO及其造型粉的热分解动力学参数和机理函数。结果表明,TNPyO及其造型粉在231℃以下均具有良好的热安定性,热分解机理均属于n=1的随机成核和随后生长;TNPyO热分解的活化能、指前因子和机理函数分别为344.01kJ/mol、3.796×1031和f(α)=(1-α),热分解动力学方程为:dα/dt=3.796×1031×(1-α)exp(-3.4401×104/T)。

The thermal decomposition processes of TNPyO and its moulding powders were studied by TG method at heating rates of 5, 10, 15, 20K/min, respectively. The thermal decomposition kinetic parameters and the mecha nism functions of TNPyO and its moulding powders were obtained by the integral iso-conversional non-linear method and Ozawa＇s method. The results show that TNPyO and its moulding powders have better thermal stability below 231 ℃ The thermal decomposition mechanism of TNPyO explosive and its moulding powders are classified as ran dom nucleation and growth of n=1. The activation energy （E）, pre-exponential factor （A） and mechanism function of the thermal decomposition process of TNPyO are 344.01 kJ/mol, 3. 796 × 10^31 andf（a） = （1-a）, respectively. The thermal decomposition kinetic equation is da/dt=3. 796 × 10^31 × （1-a）exp （-3. 4401 × 10^4/T）.