HNIW热分解残余物的红外光谱和动力学

FTIR spectra and kinetics of thermal decomposition residues from hexanitrohexaazaisowurtzitane(HNIW)

在3MPa,216℃下六硝基六氮杂异伍兹烷(HNIW)热失重分别为90.1%和91.8%的残余物分别通过差示扫描量热仪(DSC)、差示扫描量热与热重联用仪(TG/DSC)及傅立叶红外光谱仪(FTIR)进行研究.结果分析表明:HNIW失重90.1%的残余物含有少量硝基,而对该残余物再次进行热分解时,在220℃左右残留硝基被脱除.脱除残留硝基后的样品与失重91.8%的残余物均含有六员环酰胺结构,在280～400℃的温度范围内六员环酰胺大部分发生了裂解;产生DSC的吸热峰.热分解动力学分析给出了失重90.1%残余物中脱除残存硝基的反应与六员环酰胺裂解反应的反应动力学表达式.

Residues formed with mass loss of 90. 1% and 91.8% from HNIW at 3 MPa and 216℃ were studied by DSC, TG/DSC and FTIR. Residue with mass loss of 90. 1% from HNIW contains small amount of remaining nitro group. The remaining nitro group in the residue is eliminated at 220 ℃ when it is proceeded with thermal decomposition. Both the eliminated nitro group residue and the residue with mass loss of 91.8% from HNIW contain the structure of six-membered ring amide. It decomposes at the range of 280 - 400℃ and produce the endothermic peak of DSC, chemical kinetic constants of eliminating reaction of remaining nitro group and cleavage reaction of six-membered ring amide in the residue with mass loss of 90. 1% are given through analysis of kinetics for the residue with mass loss of 90.1% , respectively.