Li Xiaodong, Yang Yue, Song Changgui, Sun Yantao, Han Yuanqi, Zhao Yue, Wang Jingyu
School of Environment and Safety Engineering, North University of China, Jiancaoping District, Taiyuan 030051, China.
Materials (Basel). 2021 Feb 26;14(5):1093. doi: 10.3390/ma14051093.
To achieve a uniform distribution of the components and a better performance of aluminized composite explosives, Viton (dipolymers of hexafluoropropylene and vinylidene fluoride) @ FOX-7 (1,1-diamino-2,2-dinitroethylene) @Al microspheres and FOX-7/Viton@Al were synthesized by spray-drying strategy contrastively. Viton@FOX-7@Al owned porous and loose morphology and good sphericity with a retained crystal phase of FOX-7 and aluminum. The 23.56% fluorine content on Viton@FOX-7@Al surface indicated that Viton was completely coated on the surface of the particles. Nanosized aluminum (nAl) in Viton@FOX-7@Al had a certain catalytic activity on the thermal decomposition process of FOX-7 resulting in a depressed exothermic peak temperature and reduced apparent activation energy relative to nAl in FOX-7/Viton@Al. Because of the specific structure and the synergies between each individual component, Viton@FOX-7@Al showed reduced impact sensitivity and friction sensitivity than those of FOX-7/Viton@Al. In brief, Viton@FOX-7@Al with multilevel coating structure possessed comparatively low thermal decomposition energy requirement and improved safety performance.
为实现铝化复合炸药各组分的均匀分布并提升其性能，通过喷雾干燥策略对比合成了氟橡胶（六氟丙烯与偏二氟乙烯的二元共聚物）@FOX-7（1,1-二氨基-2,2-二硝基乙烯）@铝微球以及FOX-7/氟橡胶@铝。氟橡胶@FOX-7@铝具有多孔且疏松的形态以及良好的球形度，保留了FOX-7和铝的晶相。氟橡胶@FOX-7@铝表面23.56%的氟含量表明氟橡胶完全包覆在颗粒表面。氟橡胶@FOX-7@铝中的纳米铝（nAl）对FOX-7的热分解过程具有一定催化活性，相较于FOX-7/氟橡胶@铝中的nAl，导致放热峰温度降低且表观活化能减小。由于其特定结构以及各组分之间的协同作用，氟橡胶@FOX-7@铝相较于FOX-7/氟橡胶@铝表现出更低的撞击感度和摩擦感度。简而言之，具有多级包覆结构的氟橡胶@FOX-7@铝具有相对较低的热分解能量需求以及提升的安全性能。
