Polyurethane Material With Rapid Self‐Healing Ability and Shape Recovery Performance

ABSTRACT Rapid self‐healing is critical to prevent microcrack propagation into macroscopic fractures in materials, which is a key limitation of traditional systems. Herein, we report a polyurethane material (PIS) designed for exceptional rapid self‐healing performance under mild conditions. By incorporating a disulfide‐containing chain extender and an aliphatic isocyanate, PIS achieves a tensile strength of 25.2 MPa and an elongation at break of 461%. The material regains its original shape within 30 s of 200% elongation, demonstrating outstanding recovery. Surface scratches are completely repaired within 120 s, achieving 100% self‐healing efficiency. This rapid repair capability underscores the potential of disulfide‐based dynamic bonds in the development of advanced self‐healing materials for practical applications that combine durability, efficiency, and ease of use.