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含能材料  2014 

DNGTz的非等温热分解动力学及热安全性

DOI: 10.11943/j.issn.1006-9941.2014.06.011

Keywords: 物理化学,3,6-二硝基胍基-1,2,4,5-四嗪(DNGTz),非等温热分解动力学,热安全性,热爆炸

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Abstract:

合成了3,6-二硝基胍基-1,2,4,5-四嗪(DNGTz),运用差示扫描量热法(DSC)和热重法(TG-DTG)研究其热行为。以DSC曲线数据为基础,采用Kissinger法、Ozawa法和积分法研究了DNGTz的非等温热分解机理及动力学,获得DNGTz的热分解表观活化能和指前因子分别为187.23kJ·mol-1和1015.01s-1,其热分解机理为相边界反应,热分解机理函数的微分形式为f(α)=1。为了对DNGTz进行热安全性研究,估算得到DNGTz的密度(ρ=1.762g·cm-3)和导热系数(λ=0.1856W·m-1·K-1),同时应用Micro-DSCIII微热量仪对DNGTz进行了比热容(cp)测定,得到了DNGTz的比热容随温度变化的方程cp(J·g-1·K-1)=-2.8805+2.1283×10-2T-2.3132×10-5T2-1.1689×10-8T3(287Kbe=262.31℃)和热爆炸临界温度(Tbp=277.68℃),进而计算获得半径为1m的DNTGz几何体(无限圆柱、球或无限平板)在环境温度300K时的热感度概率密度函数S(T)与温度(T)的关系曲线、峰值温度(TS(T)max)、热安全度(SD)、临界热爆炸环境温度(Tacr)和热爆炸概率(PTE),结果表明球形样品的热安全性稍高于无限圆柱或平板状的样品。

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