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含能材料  2014 

硝硫混酸对一硝基甲苯热稳定性的影响

DOI: 10.3969/j.issn.1006-9941.2014.04.015

Keywords: 物理化学,一硝基甲苯(MNT),硝硫混酸,绝热加速量热仪(ARC),差示扫描量热(DSC),热稳定性

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Abstract:

为获得硝硫混酸中一硝基甲苯(MNT)的热分解信息,分析硝硫混酸对MNT热稳定性的影响,分别用差示扫描量热仪(DSC)和绝热加速量热仪(ARC)测试了MNT和含不同比例混酸MNT物料体系的热分解过程。DSC测试结果表明,混酸含量越高,MNT物料体系的起始分解温度越低;ARC测试结果显示,存在大量混酸时,MNT物料体系的起始分解温度会提前到150.7℃,比纯MNT提前了110℃左右;而最大温升速率到达时间为24h,所对应的引发温度TD24由纯MNT的299℃降低到98℃。同时,混酸的存在也使得MNT物料体系分解的比放热量和绝热温升都略有增加。因此,硝硫混酸的存在使得MNT物料体系的热稳定性降低,热危险性增大。

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