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Study on Ultrasound‐ and Spray‐Assisted Precipitation of CL‐20

2012; Wiley; Volume: 37; Issue: 6 Linguagem: Inglês

10.1002/prep.201100088

1521-4087

Jingyu Wang, Junlong Li, Chongwei An, Conghua Hou, Wenzheng Xu, Xiaodong Li,

Flame retardant materials and properties

Abstract Ultrafine hexanitrohexaazaisowurtzitane (CL‐20) samples were prepared by a ultrasound‐ and spray‐assisted precipitation method. Raw CL‐20 and ultrafine CL‐20 samples were characterized by SEM, FT‐IR spectroscopy, XRD, and particle size analysis. The impact sensitivity and thermal stability of two CL‐20 samples were also tested and compared. The results indicate that by this recrystallization process, the mean particle size of CL‐20 is 470 nm, and the particle size distribution was in the range from 400–700 nm. The particle morphology is nearly spheric with a smooth surface. Compared with raw CL‐20, the impact sensitivity of the ultrafine sample is significantely reduced and the drop height ( H 50 ) is increased from 12.8 to 37.9 cm. The critical explosion temperature of ultrafine CL‐20 decreased from 235.6 to 229.0 °C, which suggests that the thermal stability of ultrafine CL‐20 is lower than that of raw CL‐20.