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

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.