Synergistic engineering of energetic materials: from molecular design to advanced manufacturing

Abstract

Energetic materials are crucial in defense, aerospace, and industrial applications, with their performance heavily dependent on the interplay between molecular design, component systems, and manufacturing technologies. Advancements in molecular engineering have enabled the rational design of high-energy, low-sensitivity compounds by manipulating functional groups and intermolecular interactions. Strategic functionalization (e.g., amino-nitro push–pull motifs, intramolecular hydrogen bonding, halogenation, N-oxidation, cage functionalization, etc.) enables modulation of the energy-sensitivity trade-off, though simultaneous maximization of both metrics remains elusive due to competing bond dissociation and stability requirements. Practical high-energy formulations face significant trade-offs in energy processing, necessitating targeted component optimization. Aluminum hydride (AlH₃) outperforms conventional aluminum powders to enhance gravimetric energy density. Ammonium dinitramide (ADN) and hydroxylammonium nitrate fuel/oxidizer (HNF) replace ammonium perchlorate (AP) oxidizers, eliminating corrosive HCl emissions while improving specific impulse. Energetic complexes (e.g., copper(III) triazole perchlorate) replace toxic lead-based compounds as ballistic modifiers. Glycidyl azide polymer (GAP) and high-energy thermoplastic elastomers (ETPE) offer superior performance to inert HTPB binders and phthalate plasticizers, combining structural integrity with positive heat of formation to achieve the goal of high-performance, circular economy manufacturing. In the processing of high-energy materials, techniques such as crystallographic control, interface engineering, and defect management that govern microscale structure optimization have significantly enhanced material performance. For macroscale shaping, methods such as casting, pressing, and extrusion are critical for large-scale production, while 3D printing enables the fabrication of complex geometric structures. Nevertheless, reproducibility across production scales and defect-induced performance variability remain critical bottlenecks. This review integrates molecular engineering, component system optimization, and advanced fabrication into a unified framework, treating reproducibility and stability as design criteria of equal importance to performance and safety. Future directions toward quantifiably stable, reproducibly manufacturable, and sustainable energetic systems are outlined to guide next-generation development.