1, 1′-Azobis(cyclohexanecarbonitrile) (ABCN) is a kind of azo compound, which is widely used as an initiator in the polymer industry. Plenty of heat will be released during the thermal decomposition, and fire or explosive accidents could happen when the cooling system of the polymerization reactor fails. In this manuscript, the thermal decomposition behavior of ABCN under a dynamic temperature environment was investigated by simultaneous thermogravimetric analyzer (STA). Differential scanning calorimeter (DSC) was used to detect the thermal effects of different stages of mass loss. The apparent activation energy was calculated by Kissinger-Akahira-Sunose methods (K-A-S methods). The thermal runaway behavior was investigated by accelerating rate calorimeter (ARC), which was used to predict time to maximum rate under adiabatic condition (TMR_ad). The results show that the temperatures at TMR_ad = 8 h and 24 h are 93.0 °C and 89.7 °C, respectively. The self-accelerating decomposition temperature (SADT) is 86.6 °C, which is calculated based on the thermal theory of Semenov. Since ABCN is used at 60–90 °C, a major accident could happen when the heat accumulated in the reactor is not removed timely. The risk of thermal runaway reactions for ABCN was defined against the risk matrix as level Ⅲ, which is an unacceptable risk. The carbon radicals and nitrogen were released during the decomposition of ABCN based on the experiment result of thermal gravimetric analyzer-Fourier transform infrared spectrometer (TG-FTIR) system. Several safety assessment parameters could supply references for the industry to alleviate thermal hazards and prevent critical incidents.

1, 1'-Azobis(cyclohexanecarbonitrile) (ABCN)是一种偶氮化合物，在高分子工业中广泛用作引发剂。热分解过程中会放出大量热量，当聚合反应器的冷却系统出现故障时，可能会发生火灾或爆炸事故。在这份手稿中，ABCN 在动态温度环境下的热分解行为通过同步热重分析仪 (STA) 进行了研究。差示扫描量热仪 (DSC) 用于检测不同质量损失阶段的热效应。表观活化能通过Kissinger-Akahira-Sunose方法(KAS方法)计算。热失控行为通过加速量热仪 (ARC) 进行研究，用于预测绝热条件下达到最大速率的时间（TMR_广告）。结果表明， TMR _ad = 8 小时和 24 小时的温度 分别为 93.0 °C 和 89.7 °C。自加速分解温度（SADT) 为 86.6 °C，这是根据谢苗诺夫的热学理论计算得出的。由于 ABCN 在 60-90 °C 下使用，如果反应器中积聚的热量没有及时排出，可能会发生重大事故。ABCN 的热失控反应风险根据风险矩阵定义为 III 级，这是不可接受的风险。根据热重分析仪-傅里叶变换红外光谱仪（TG-FTIR）系统的实验结果，ABCN在分解过程中释放出碳自由基和氮。多项安全评估参数可为业界提供参考，以减轻热危害和预防重大事故。