Multifunctional Fluorine-Rich Ion-Conductive Elastomer for Combustion-Enhanced Energetic Composites

By introducing a fluorosiloxane crosslinker (VFSoil), the resulting LiF₂C_VFSoil exhibited the most favorable comprehensive performance with toughness of 23.23±0.05 MJ·m^–3, ionic conductivity of 7.517×10^–5 S/m, thermally activated self-healing capability, and favorable hydrophobicity. When applied as a binder for cyclotetramethylenetetranitramine (HMX, octogen)-based composites, the H₅₀(LiF₂C_VFSoil)₅₀ formulation maintained excellent stretchability with an elongation at break of 578.12% and exhibited thermally activated self-healing capability at 80 °C. Furthermore, the H₉₀(LiF₂C_VFSoil)₁₀ formulation improved both the mechanical and electrostatic safety relative to pristine HMX.

Moreover, high-speed photography and infrared thermography revealed that the fluorine-rich binder LiF₂C_VFSoil effectively disrupted the alumina passivation shell, suppressed aluminum nanoparticles (nano-Al) agglomeration, and delivered superior combustion uniformity and sustained high flame temperatures in aluminized formulations. This work presents a promising molecular design platform for developing next-generation PBXs featuring ultra-stretchability, thermally activated self-healing capability, and enhanced combustion performance.