Lu Jiaxin, Chen Chong, Zhang Bobo, Niu Kang, Xiao Fei, Liang Taixin
School of Environment and Safety Engineering, North University of China, Taiyuan, 030051, Shanxi, China.
Sci Rep. 2024 Sep 20;14(1):21979. doi: 10.1038/s41598-024-71246-0.
Boric acid and other impurities on the surface of boron (B) particles can interact with hydroxyl-terminated polybutadiene (HTPB), weakening the mechanical properties and energy release efficiency of boron-based solid rocket propellants. SA@B composite particles were created by coating stearic acid (SA) on the surface of B particles through solvent evaporation-induced self-assembly. The study investigated the impact of SA coating on the combustion performance of B particles and the mechanical properties of HTPB matrix composites. The results showed that the SA coating enhanced the oxidation efficiency of B particles in air. The combustion heat of SA@B composite particles is 30.29 MJ/g, about 50% higher than that of B particles. During the combustion of SA@B composite particles, fewer molten solid particles surround the flame, which enhances the stability of the combustion process of the B particles. Furthermore, the SA coating effectively enhanced the dispersion of B particles in HTPB. At a stretching speed of 100 mm/min, the tensile strength of the SA@B/HTPB composite materials is higher than that of the B/HTPB composite materials. Moreover, when the mass loading of the SA@B composite particles reaches 50 wt%, the tensile strength of SA@B/HTPB composite materials is 2.46 MPa. Activating the surface of boron particles with SA can significantly improve their compatibility with HTPB, which is crucial for the stable storage of boron-based solid rocket propellants.
硼（B）颗粒表面的硼酸和其他杂质会与端羟基聚丁二烯（HTPB）发生相互作用，削弱硼基固体火箭推进剂的力学性能和能量释放效率。通过溶剂蒸发诱导自组装法在B颗粒表面包覆硬脂酸（SA）制备了SA@B复合颗粒。该研究考察了SA包覆对B颗粒燃烧性能以及HTPB基复合材料力学性能的影响。结果表明，SA包覆提高了B颗粒在空气中的氧化效率。SA@B复合颗粒的燃烧热为30.29 MJ/g，比B颗粒高约50%。在SA@B复合颗粒燃烧过程中，围绕火焰的熔融固体颗粒较少，这提高了B颗粒燃烧过程的稳定性。此外，SA包覆有效提高了B颗粒在HTPB中的分散性。在拉伸速度为100 mm/min时，SA@B/HTPB复合材料的拉伸强度高于B/HTPB复合材料。而且，当SA@B复合颗粒的质量分数达到50 wt%时，SA@B/HTPB复合材料的拉伸强度为2.46 MPa。用SA对硼颗粒表面进行活化能够显著提高其与HTPB的相容性，这对硼基固体火箭推进剂的稳定储存至关重要。
