偶氮二甲酸二异丙酯热分解机制及热分解产物研究

Thermal Decomposition Mechanism and Pyrolysis of Diisopropyl Azodicarboxylate

偶氮二甲酸二异丙酯作为偶氮类化合物的一种,由于其自身的结构特性极易发生热分解。通过C80微量热仪测试分析其热分解行为,并使用TG-FTIR-MS联用设备分析其热解过程及产物。结果表明,偶氮二甲酸二异丙酯的热分解过程有一个明显的分解放热峰,其放热量约为(945.67±23.45)J/g。并对其热解过程进行推断:首先是C-O单键断裂,?CH(CH3)2裂解析出;然后C-N键断裂,O=C-O析出或是N=N键断裂,O-CO-N析出;最后再发生?CH(CH3)2裂解为:CH2、?CH(CH3)2析氢生成CH2=CHCH3;C-O单键断裂,O=C(CH3)析出、氧化变成H2O、CO2等复杂过程。

Diisopropyl azodicarboxylate, as a kind of azo compound, is prone to thermal decomposition due to its own characteristics. In this paper,the thermal behavior and decomposition mechanism were studied by using C80 Micro Calorimeter and TG-FTIR-MS. The results showed that the thermal decomposition process of diisopropyl azodicarboxylate had a distinct heat release peak, and its heat release was about(945.67±23.45)J/g. And the pyrolysis process was inferred: firstly, the C-O single bond broke,·CH(CH3)2 were resolved;then the C-N bond broke, O = C-O precipitated or N=N bond broke, O-CO-N precipitated;Finally, ?CH(CH3)2 was cleaved into CH2, ?CH(CH3)2 hydrogen evolution to form CH2=CHCH3;C-O single bond broke, O=C(CH3) precipitated and was oxidized into H2 O, CO2 and so on.