摘要
为了研究重结晶前后LLM-105在敞开体系、绝热体系中的热分解特性,采用溶剂-非溶剂法制备了形状规则、缺陷更少的重结晶LLM-105。以差示扫描量热仪研究了LLM-105的非等温热分解行为,利用Friedman法得到了非等温热分解动力学参数及TD24。采用加速量热仪研究了LLM-105的绝热分解行为,计算了绝热分解动力学参数及SADT。结果表明,重结晶LLM-105的非等温热分解起始温度(升温速率为10℃/min)、绝热起始分解温度、绝热最大升温速率分别为353.12℃、277.19℃、77.39℃/min,未重结晶LLM-105的相应参数值分别为341.62℃、273.77℃、136.62℃/min。重结晶LLM-105的非等温热分解起始温度、绝热起始分解温度更高,绝热最大升温速率更小。结晶品质是LLM-105的热分解特性、热危险性的重要影响因素。重结晶LLM-105具有更好的热稳定性,绝热分解反应更温和。
The present paper is aimed at offering its investigation results of the non-isothermal thermal decomposition behavior of LLM-105 by using a differential scanning calorimeter at the heating temperature rates of 2 ℃/min,4 ℃/min,6 ℃/min,8 ℃/min,10 ℃/min. In it,we have calculated the non-isothermal thermal decomposition kinetic parameters and TD24 via Friedman approach so as to identify and determine the thermal decomposition features of 2,6-diamino-3,5-dinitropyrazine-1-oxide( LLM-105) under the open system and adiabatic system. At the same time,we have also managed to work out certain defects through which the recrystallized LLM-105 with regular shape has been prepared by taking the dimethyl sulfoxide as the solvent with the mixed solution of dimethyl sulfoxide and water being as the antisolvent. Nevertheless,what we would like to gain is to identify and determine the adiabatic decomposition behavior of LLM-105,and gain the temperature changing curves,its rising rate,the pressure and pressure changing rate with time in the adiabatic decomposition process through the accelerating rate calorimeter and calculation of the adiabatic decomposition kinetic parameters and SADT. It is just on the basis of the series of thermal decomposition characteristic parameters and the thermal safety parameters obtained,we have successfully evaluated the thermal hazard of the recrystallized LLM-105 and made a comparison with the unrecrystallized LLM-105. The above results indicate that the recrystallized LLM-105 began to decompose at the temperature of 353. 12 ℃ in the open system( with a heating rate of 10 ℃/min) and at 277. 19 ℃ in the adiabatic system. The maximum adiabatic temperature rising rate and the maximum pressure changing rate have been found at 77. 39 ℃/min and 5 086. 17 kP a/min,respectively,whereas the unrecrystallized LLM-105 began to decompose at 341. 62 ℃ and 273. 77 ℃,accordingly.And,definitely speaking,the maximum adiabatic temperature rising rate and the maximum pressure changing rate should b
作者
金韶华
李土娟
王雨乔
陈煜
张晓鹏
王俊峰
李领弟
JIN Shao-hua;LI Tu-juan;WANG Yu-qiao;CHEN Yu;ZHANG Xiao-peng;WANG Jun-Feng;LI Ling-di(School of Materials,Beijing Institute of Technology,Beijing 100081,China;Gansu Yinguang Chemical Industry Group Co.Ltd.,Baiyin 730900,Gansu,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2019年第3期854-861,共8页
Journal of Safety and Environment
基金
中央高校基本科研业务费专项
关键词
安全工程
LLM-105
热分解行为
加速量热仪
热危险性
safety engineering
LLM-105
thermal decomposition behavior
accelerating rate calorimeter
thermal hazard
