RDX和HMX的热分解Ⅲ.分解机理

简述RDX和HMX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—FTIR联用技术和热裂解原位池／FTIR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HMX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1589cm^-1和1278cm^-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HMX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 N2O, CH2O, CO, CO2, H2O and HCN. The double peaks appear on the curves of temperature dependence of IR absorbance of CH2O and H2O for RDX. The two different rates of IR absorption intensities occur on temperature dependence of 1 589cm^-1and 1 278cm^-1bands attributed to-NNO2 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.