To improve reaction rate of energetic materials, electrospray technology was applied to develop microspheres in which recrystallized cyclotrimethylene trinitramine (RDX) was integrated with nano-Al (nAl) particles and Viton through a two-solvent strategy. Results on morphology properties and chemical heterogeneity demonstrated that the electrosprayed microspheres were hollow spheres containing well-dispersed RDX . It was suggested that RDX nano-crystals adhere tightly on both sides of the nAl@Viton skeletons, thereby increasing the contact area among components. The thermal analysis of the microspheres indicated that nAl particles accelerated the energy release by decreasing the apparent activation energy for microsphere decomposition. Experimental results showed that electrosprayed nAl@RDX@Viton had shorter laser ignition delay and more vigorous combustion flame than the physical mixture, which benefitted from the characteristic structure and synergistic effects of the components.
Liu Yang,Liu Yuezhou,Gao Fulei,Liu Yingzhe,Wang Yinglei
Boron has attracted increasing attention in the field of high-energy explosives and propellants due to its high volume calorific value and mass calorific value. However, the complicated combustion process and low combustion efficiency hinder its wide application. To tackle this challenge, bioinspired polydopamine (PDA) interface reinforced boron-Viton composites, with high structure stability and excellent energy releasing efficiency, are designed and prepared, combining the interface regulation of PDA biomimetic materials and combustion promotion of fluoropolymers. Firstly, the stronger adsorption energy of PDA with boron compared to Viton was demonstrated by molecular dynamics simulations. Next, B@PDA@Viton is prepared by the combination of in-situ dopamine polymerization and solvent-non-solvent methods, and the double-layer core-shell structure is confirmed by XPS, FTIR, and TEM characterizations. TG-DSC analysis shows that B@PDA@Viton possesses superior thermal properties, with a 55.48% increase in oxidation heat compared to raw B. Furthermore, ignition and combustion performance tests indicate that B@PDA@Viton reduces ignition delay by 57.56% and increases heat of combustion by 68.63% relative to raw B. These findings elucidate the ignition and combustion mechanisms of B@PDA@Viton. This work not only developed high-performance boron-based composite fuels but also provides insights into the development of boron-based fuels.
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