ABSTRACT Efficient combustion of boron (B) is limited by the molten oxide shell and complex intermediate products. To address these issues of B combustion, a series of B‐based energetic composites (BKP/PT) were prepared in this work, where polyethylene glycol (PEG), potassium perchlorate (KP) and 4,4’,6,6’‐tetra(azido)hydrazo‐1,3,5‐triazine (TAHT) were employed as surfactant, oxidizer and energetic component, respectively. The contrast BKP/PH composites were also obtained by substituting TAHT with 1,3,5,7‐tetranitro‐1,3,5,7‐tetrazocine (HMX). In the assembly process, four azido groups of TAHT will form stronger non‐covalent molecular interactions with hydroxyl groups of PEG, and also endow PEG‐TAHT (PT) a higher formation enthalpy than that of PEG (PH). Besides, the molten B 2 O 3 and generated impurities during the combustion of B were eliminated due to the superior energy and abundant N 2 from TAHT. Thus, BKP/PT composites possess better interface reactivity than BKP/PEG‐2 and BKP/PH. Importantly, the peak values of combustion heat, maximum pressure, pressurization rate, and burn rate were realized by BKP/PT‐2 (1.25% PEG and 5.0% TAHT), increasing by 38.47%, 130.53%, 257.69%, and 134.33% relative to that of raw BKP, respectively. Finally, the synergistic enhancement mechanism of PEG‐TAHT on BKP combustion was analyzed according to the detailed product studies. In all, this strategy will improve the engineering application of B and TAHT in various fields.
Wan et al. (Sun,) studied this question.