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ISSN Print: 2150-766X
ISSN Online: 2150-7678
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PREPARATION AND CHARACTERIZATION OF ULTRAFINE ε-HEXANITROHEXAAZAISOWURTZITANE PARTICLES
ABSTRACT
In this study, ultrafine ε-hexanitrohexaazaisowurtzitane (CL-20) particles were prepared by the high-pressure jet assisted precipitation method. The CL-20 samples were characterized by scanning electron microscopy (SEM), particle size analyzer, X-ray diffraction (XRD), and Fourier transformation infrared spectroscopy (FT-IR). Furthermore, the safety properties of samples under impact and thermal stimulus were tested and investigated. The results of SEM and particle size analysis indicate that ultrafine CL-20 particles, with a narrow particle size distribution, are about 300 nm in size and elliptical in shape. The XRD patterns and FT-IR spectra indicate that the polymorphic phase of ultrafine CL-20 particles are mainly ε-type. The differential scanning calorimetry results indicate that compared with those of raw CL-20, the exothermic decomposition peak temperature of ultrafine CL-20 decreases by about 5°C at different heating rates. The apparent activation energy of ultrafine CL-20 is about 10 kJ/mol higher than that of raw CL-20. However, the ultrafine samples have the lower thermal explosion critical temperature and higher decompose rate constant at 230° C. Compared with that of raw CL-20, the impact sensitivity of ultrafine CL-20 has been decreased significantly, for the drop height (H50) is increased from 12.8 to 32.1 cm.
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An Chongwei, Li Hequn, Ye Baoyun, Wang Jingyu, Nano-CL-20/HMX Cocrystal Explosive for Significantly Reduced Mechanical Sensitivity, Journal of Nanomaterials, 2017, 2017. Crossref