摘要
采用微量量热法在70、75、80℃条件下,研究了硝酸酯增塑GAP粘合剂体系中CL-20/HMX共晶动力学,并对微量量热试验后的产物进行X射线衍射(XRD)、环境扫描电镜(SEM)和差示扫描量热分析(DSC)。XRD、SEM、DSC分析结果表明,微量量热试验后,CL-20、HMX会相互结合形成CL-20/HMX共晶且已全部转化为CL-20/HMX共晶,采用Avrami方程和Arrhenius方程处理CL-20/HMX共晶过程微量量热热流数据,计算结果显示,温度越高结晶分数随时间增长越快,表明升温有利于提高硝酸酯增塑GAP粘合剂中CL-20/HMX共晶的生成速率;Avrami指数n=1.41,表明硝酸酯增塑GAP粘合剂体系中CL-20/HMX共晶过程符合二维成核机理;Arrhenius指前因子A=7.46×108,CL-20/HMX共晶过程的活化能Ea=108.88 k J/mol,表明CL-20/HMX共晶的结晶速率常数k为5.26×108exp(-12980.14/T),CL-20/HMX共晶动力学方程为1-a=exp[-5.26×108exp(-12980.14/T)t1.41]。
The microcalorimetry method was used to study the dynamics of CL-20/HMX co-crystal in nitrate plasticized GAP adhesive system at 70℃,75℃,and 80℃,and X-rays Diffraction(XRD),environmental scanning electron microscopy(SEM),and differential scanning calorimetry(DSC)were performed on the products after the microcalorimetry test.XRD,SEM,and DSC analysis results show that CL-20 and HMX will combine with each other to form a CL-20/HMX co-crystal after the microcalorimetric test,and all of them have been converted into CL-20/HMX co-crystal.The Avrami equation and Arrhenius equation are used to process the trace heat and heat flow data of the CL-20/HMX co-crystal process.The calculation results show that the higher the temperature,the faster the crystallization fraction increases with time,indicating that the temperature increase is beneficial to improve the nitrate plasticized GAP adhesive formation rate of CL-20/HMX co-crystal;Avrami index n=1.41,indicating that the CL-20/HMX co-crystal process in nitrate plasticized GAP adhesive system conforms to the two-dimensional nucleation mechanism;Arrhenius refers to the pre-factor A=7.46×108,the activation energy Eaof the CL-20/HMX co-crystal process is Ea=108.88 k J/mol,indicating that the crystallization rate constant k of the CL-20/HMX co-crystal is k=5.26×108 exp(-12980.14/T),and the kinetic equation of CL-20/HMX co-crystal is 1-α=exp[-5.26×108 exp(-12980.14/T)t1.41].
作者
裴宝林
彭松
曹蓉
赵程远
PEI Baolin;PENG Song;CAO Rong;ZHAO Chengyuan(Hubei Inst.of Aerospace Chemotechnology,Xiangyang 441003,China)
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2020年第5期581-586,共6页
Journal of Solid Rocket Technology
关键词
CL-20/HMX共晶
结晶动力学
Avrami方程
微量量热法
2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane(CL-20/HMX)co-crystal
crystallization dynamics
Avrami equation
microcalorimetry
