摘要
六硝基六氮杂异伍兹烷(CL-20)是目前能量最高的单质炸药,为了进一步提高其爆轰性能,以过氧化脲作为H2O2的原料,在低温低压干燥的环境下,采用溶剂挥发法构筑了CL-20/H2O2主客体含能炸药。利用粉末X-射线衍射(PXRD)和拉曼光谱对其结构进表征。结果表明,制备的CL-20/H2O2主客体炸药是正交晶系的晶体,空间群为Pbca,具有长程有序堆积的结构。经同步热分析仪(TG-DSC)测试得到主体CL-20分子与客体H2O2分子之间的摩尔比为2:1。利用原位高温XRD研究了CL-20/H2O2的热晶变行为,结果表明,随着温度的升高,CL-20/H2O2逐渐转变为γ-CL-20,并且相转变效率高于ε-CL-20。通过对CL-20/H2O2生长过程的追踪,观察到在溶液结晶过程中,CL-20/CH3CN亚稳相为重要的中间体,并经过一个固相转晶过程最终形成CL-20/H2O2主客体炸药晶体。
Hexanitrohexaazaisowurtzitane(CL-20)with a negative oxygen balance,is currently the most powerful commercially available explosive. In this work,the CL-20/H2O2 host-guest energetic material(CL-20/H2O2)was constructed by using urea hydrogen peroxide(UHP)as raw material through the solvent volatilization at low temperature and negative pressure. The structure of the complex was confirmed through X-ray diffraction(XRD)and Raman spectra. Results indicates that CL-20/H2O2 crystal-lizes in orthorhombic system space group Pbca with a long-range ordered stacked structure. The ratio of CL-20 molecule and H2O2 molecule is 2∶1 stoichiometry according to the thermogravimetry and simultaneous differential scanning calorimetry(TG-DSC)analyses. Furthermore,the polymorph transitions of CL-20/H2O2 with increasing temperature were investigated by in situ high temperature XRD. Results show that CL-20/H2O2 gradually converts to γ-CL-20 with elevated temperature and the rate of transition is faster than that of ε-CL-20. The CL-20 acetonitrile solvate(CL-20/CH3 CN)is a key intermediate via a solid state phase transition to form the CL-20/H2O2 host-guest energetic material by tracing the growing process of CL-20/H2O2.
作者
余治慧
徐金江
孙善虎
王洪范
张浩斌
段晓畅
朱春华
王树民
孙杰
YU Zhi⁃hui;XU Jin⁃jiang;SUN Shan⁃hu;WANG Hong⁃fan;ZHANG Hao⁃bin;DUAN Xiao⁃chang;ZHU Chun⁃hua;WANG Shu⁃min;SUN Jie(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Institute of Chemical Materials,CAEP,Mianyang 621999,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2020年第2期127-136,共10页
Chinese Journal of Energetic Materials
基金
National Natural Science Foundation of China(21805259)
作者简介
YU Zhi⁃hui(1993-),female,master student,crystal engineering of energetic materials.e⁃mail:s3071098@163.com;Corresponding author:WANG Shu⁃min(1974-),male,profes⁃sor,modification of crystal.e⁃mail:shu_minwang@163.com;Corresponding author:Sun Jie(1972-),male,professor,crystal engineering of energetic materials.e⁃mail:sunjie@caep.cn。
