The hexanitrostilben (HNS) is a thermally stable explosive that can be prepared from hexanitrobibenzyl (HNBB). Therefore, the investigation of thermal stability of HNBB can be important in the yield of preparation of HNS. The decomposition kinetic of HNBB and HNS are studied by non-isothermal gravimetric method. The TG/DTG curves in non-isothermal method are obtained in range of 25°C–400 °C at heating rates of 3 °C/min, 5 °C/min, 8 °C/min, 10 °C/min and 12 °C/min. The data of weight-temperature are used for calculation of activation energy (E_a) of thermal decomposition reactions by methods of Ozawa, Kissinger, Ozawa-Flynn-Wall (OFW) and Kissinger-Akahira-Sunose (KAS) as model-free methods and Strink's equation as model-fitting method. The compensation effect is used for prediction of mechanism and determination of pre-exponential factor (lnA) of the decomposition reaction. A reduction 60 kj/mol for the average of activation energy of thermal decomposition reaction of HNBB is obtained versus HNS. This result shows the lower thermal stability of HNBB in comparison to HNS. The Avrami equation (A_3/2) with function f(α) = 3/2(1-α)[-ln(1-α)]^1/3 indicates the predicted mechanism for thermal decomposition reaction both explosives.

六硝基芪（HNS）是一种热稳定的炸药，可由六硝基联苄（HNBB）制备。因此，研究HNBB的热稳定性可能对制备HNS的产率很重要。用非等温重量法研究了HNBB和HNS的分解动力学。非等温方法的TG / DTG曲线是在25°C–400°C的范围内以3°C / min，5°C / min，8°C / min，10°C / min和12°C /分钟 重量-温度数据用于计算活化能（E _a）通过小泽，基辛格，小泽-弗林-沃尔（OFW）和基辛格-赤平-Sunose（KAS）的方法作为无模型方法进行热分解反应，并以Strink方程作为模型拟合方法。该补偿作用用于预测分解反应的机理和确定预指数因子（ ln A）。与HNS相比，HNBB的热分解反应的平均活化能降低了60kj / mol。该结果表明与HNS相比，HNBB的热稳定性较低。Avrami方程（A _3/2）与函数˚F（α）= 3/2（1- α）[ - LN（1- α）] ^1/3 表明两种爆炸物的热分解反应的预测机理。