Dual‐Curing Enhances Mechanical Performance of <scp>GAP</scp> ‐Based Fluorinated Polytriazole–Polyurethane Elastomers

ABSTRACT Polymeric binders play a critical role in composite solid propellants by firmly bonding all components, forming the matrix and skeleton, and enhancing toughness to maintain the propellants' structural integrity and mechanical properties. Therefore, developing energetic and tough binders is essential. Glycidyl azide polymer (GAP) is widely used in solid propellants, but its poor flexibility leads to a high glass transition temperature. Introducing fluorine into binders can improve thermal stability, optimize the oxygen balance of solid propellants, reduce oxidizer usage, enhance the utilization of energetic materials, and increase propellant energy. In this study, fluorinated polyether was grafted onto the side chains of GAP 1k via click chemistry to synthesize GAP 1k ‐ g ‐F 3 , which was then dual cured with a multifunctional alkyne‐terminated curing agent and an isocyanate‐based curing agent to prepare GAP 1k ‐ g ‐F 3 ‐PTU. The mechanical properties, thermal stability, and microstructure of the elastomers were characterized by uniaxial tensile testing, dynamic thermomechanical analysis, thermogravimetric analysis, and scanning electron microscopy.