【摘要】 采用5、10、15、20 K/min的不同线性升温速率,研究硝酸胍（GN）的热分解过程,通过Flynn-Wall-Ozawa（FWO）法、Kissinger Akahira and Sunose（KAS）法和Coats-Redfern（CR）法进行热动力学分析,并利用热力学理论求解相关热安全性参数。结果表明,硝酸胍在450～700 K的温度范围内呈一步失重,热重法（TG）的平均外推起始温度为580.28 K;当转化率为0.1～0.9时,FWO法和KAS法得到的平均表观活化能分别为140.43 kJ/mol和137.82 kJ/mol,自燃倾向等级为Ⅰ级;CR法表明Avrami-Erofeev（A2）为硝酸胍的最适机理函数模型;在310～370 K的温度范围内,硝酸胍的比热容随温度的升高而逐渐增大,平均值为3.148 J/（g·K）;自加速分解温度(T_SADT)和自发火温度(T_be0)分别为530.15 K和548.10 K;活化熵（ΔS^≠）和活化焓（ΔH^≠）随升温速率的增大而减小,活化自由能（ΔG^≠）和反应速率常数随升温速率的增大而增大。更多还原

【Abstract】 The thermal decomposition of guanidine nitrate（GN） has been studied at different linear heating rates of 5, 10, 15 and 20 K/min. The thermokinetics of GN was analysed by the Flynn-Wall-Ozawa（FWO） method, the Kissinger-Akahira-Sunose（KAS） method and the Coats-Redfern（CR） method. The thermal safety parameters were extracted using thermodynamic theory. The results showed that GN displayed a one-step weight loss in the temperature range 450-700 K, and the average extrapolated onset temperature in thermogravimetry（TG） is 580.28 K. The average activation energies obtained using the FWO and KAS methods are 140.43 kJ/mol and 137.82 kJ/mol, respectively, when the conversion rates are 0.1-0.9, and the level of spontaneous combustion tendency is grade Ⅰ. The CR method showed that Avrami-Erofeev（A2） is the optimal mechanistic function model for GN. The specific heat capacity of GN increases gradually with increasing temperature when the temperature is in the range 310-370 K, and the average value is 3.148 J/（g·K）. The self-accelerating decomposition temperature(T_SADT) and the spontaneous ignition temperature(T_be0) are 530.15 K and 548.10 K, respectively. The activation entropy（ΔS^≠） and activation enthalpy（ΔH^≠） decrease as the heating rate increases, while activation free energy（ΔG^≠） and reaction rate constant increase as the heating rate increases.更多还原