AN Chong-wei, LI He-qun
(School of Chemical and Enviromental Engineering, North University of China, Taiyuan 030051, China)
Abstract： X-ray diffraction (XRD), differential scanning calorimeter (DSC) and impact sensitivity instrument were used to characterize the properties of 1-Methyl-4, 5-dinitroimidazole (MDNI). Furthermore, specific heat capacity, thermal kinetic parameters, thermal decomposition reaction rate constant, critical explosion temperature and the drop height for impact initiation of MDNI were calculated and analyzed. The results show that MDNI is well-crystallized. The melting point of MDNI is about 74 ℃, and the specific heat capacity of MDNI is 9.314 4 J/(g·K) and 10.596 0 J/(g·K) when the temperature is 60 ℃ and 90 ℃, respectively. The apparent activation energy and pre-exponential factor of MDNI are calculated as 81.62 kJ/mol and 6.78×107 s-1, respectively. The relationship between thermal decomposition reaction rate constant of MDNI and temperature is logk=7.83-4268.11/T. The critical temperature of MDNI thermal explosion is 234.86 ℃. The drop height for impact initiation of MDNI is 95.3 cm.
Key words： 1-Methyl-4, 5-dinitroimidazole; X-ray diffraction (XRD); thermal decomposition; kinetic; impact sensitivity
CLD number： TJ55Document code： A
Article ID： 1674-8042（2015）01-0083-06 doi： 10.3969/j.issn.1674-8042.2015.01.015
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1-甲基-4，5-二硝基咪唑的性能与表征
安崇伟， 李鹤群
（中北大学 化工与环境学院， 山西 太原 030051）
摘要:采用X射线衍射仪（XRD）、 差示扫描量热仪（DSC）和撞击感度仪分别对1-甲基-4，5-二硝基咪唑（MDNI）的性能进行表征。 并对MDNI样品的比热容、 热动力学参数、 热分解反应速率常数、 临界爆炸温度和撞击特性落高进行计算和分析。 结果表明， MDNI样品为晶体结构且结晶良好。 MDNI的熔点在74 ℃左右， 在60 ℃和90 ℃时的比热容分别为9.314 4 J/(g·K)和10.596 0 J/(g·K)。 MDNI的表观活化能为81.62 kJ/mol， 指前因子为6.78×107， 热分解反应速率常数（k）与温度的关系为logk=7.83-4268.11/T， 临界爆炸温度为234.86 ℃， 特性落高H50为95.3 cm。
关键词:1-甲基-4，5-二硝基咪唑； XRD； 热分解； 动力学； 撞击感度
引用格式：AN Chong-wei, LI He-qun. Properties and characterization of 1-methy-4, 5-dinitroimidazole. Journal of Measurement Science and Instrumentation, 2015, 6(1)： 83-88. ［doi： 10.3969／j.issn.1674-8042.2015.01.015］
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