六硝基六氮杂异伍兹烷微球的声流控制备工艺及性能表征

To cnhancc thc Performance and safety of energetic materials (CL-20), microfluidic technology has bccn widcly used in the microsphere preparation process. By integrating droplct microfluidics with surfacc acoustic wave technology, cthyl acetate droplets with exceptional uniformity in sizc are created. Subsequently, micrometer-sized CL-20/NC energetic microsphcrcs are fabricatcd using a solvent-nonsolvent recrystallization approach. The droplet generation process is monitored cmploying a high-speed camera. The results demonstrate that surface acoustic wave technology can effectively regulate thc transition of droplet generation modes, averting uncontrollable shifts caused by material precipitation and channel obstructions, thereby ensuring consistent and uninterrupted droplet generation. The morphologics of microspheres with varying particle size, CL-20 contents and NC contents are characterized by field emission scanning electron microscopy (SEM). The findings suggcst that diminishing CL-20 content, augmenting NC content, or increasing microsphere size can diminish surfacc roughncss and minimize defects. With thc support of surfacc acoustic wave technology, thc cocfficicnt of Variation in microsphere size decreases significantly from 39. 33% to 7. 51%, notably enhancing uniformity. The crystal strueture and thermodynamic traits of CL-20/NC microsphcrcs of different sizes are characterized using X-ray diffractometry and thermal analysis. The results indicatc that microspheres with a median particle sizc of 20 jum display superior thermal stability, with a decomposition peak temperaturc of 229. 04 °C, surpassing that of microsphcrcs with a median particle sizc of 7 (im at 228. 22 °C. Microspheres with a median sizc of 7 p.m. exhibit heightened rcactivity and energy density, manifesting a higher mass loss rate (84. 3%) and heat rclcasc (12. 05 mW/mg) compared to their 20,um counterparts, which demonstrate a mass loss rate of 80. 2% and heat rclcasc of 8. 84 mW/mg.