RDX和HMX的热分解III.分解机理

简述RDX和HM X热分解的各种机理,其热分解的初始过程是N-N和C-N键断裂的竞争反应,试验条件和样品相态等因素影响竞争过程。用DSC-FT IR联用技术和热裂解原位池/FT IR分析了主要分解气相产物和凝聚相中主要官能团的变化。结果表明,RDX和HM X热分解的主要分解气相产物为N2O,CH2O,CO,CO2,H2O和HCN。RDX的分解气相产物CH2O和H2O红外吸收率的温度关系曲线都产生双峰,RDX基团-NNO2的吸收带1 589 cm-1和1 278 cm-1有两个不同速率的变化过程。用N-N键和C-N键竞争断裂的观点解释了RDX与HM X热分析和产物分析的结果。

Thermal Decomposition of RDX and HMX Explosives Part III: Mechanism of Thermal Decomposition

The thermal decomposition mechanism of RDX and HMX were in brief reviewed.The competing reactions of N-N and C-N bonds splitting occurred in initial stage of RDX and HMX decomposition are affected by the experimental conditions and sample phase state.The main gas products of decomposition were identified by DSC-FTIR coupling technique.The changes of the main function groups in condensed phase were measured by a in situ thermolysis cell/FTIR technique.The main gas products of RDX and HMX decomposition consist of N_2O,CH_2O,CO,CO_2,H_2O and HCN.The double peaks appear on the curves of temperature dependence of IR absorbance of CH_2O and H_2O for RDX.The two different rates of IR absorption intensities occur on temperature dependence of 1589cm~(-1)and 1278cm~(-1)bands attributed to-NNO_2 for RDX.On the basis of view point for the competing reactions,the results of thermal analyses and product analyses for RDX and HMX decompositions are explained.