There is a trade-off between mechanical and self-healing performance for crosslinked self-healing materials. Herein, we design a polyurethane material containing triple synergy dynamic bonds to address the dilemma. The as-prepared polyurethane exhibits a maximum stress of 27.3 MPa and excellent self-healing performance. Specifically, boric acid is used as a cross-linker and the network cross-linked with boronic ester bonds under alkaline conditions is highly beneficial in terms of mechanical properties. Meanwhile, disulfide bonds and reversible boronic ester bonds located at the cross-linked point and main chain are successively broken upon being damaged, which is conducive to better fluidity of chains and endows the material with superior healing efficiency and multiple cycles of healing. Consequently, the high-performance self-healing material is of great potential in the fields of high-performance coating, aerospace, and load-bearing rubber.
Aiming at the common problems of weak controllability of damping temperature range and poor mechanical properties in damping elastomer materials. Herein, we design a polyurethane‐containing dynamic disulfide bonds and dangling chains to address this dilemma. The as‐prepared polyurethane exhibits an unprecedented damping range of 182°C (−62 to 120°C), and the tensile strength reaches 6.8 MPa, which is at the forefront of the same type of research. We innovatively introduce aromatic disulfides to the system, in which disulfide bonds can be spontaneously exchanged dynamically at room temperature, making the damping performance of the elastomer above room temperature improved, and a small amount of hydroxyl‐terminated polydimethylsiloxane (OH‐PDMS) is used as a dangling chain to promote the damping property of the elastomer between the glass transition temperature and room temperature. The synergistic effect of disulfide bonds and dangling chains makes the controllability of polyurethane damping temperature range realized. Furthermore, polyurethane elastomer is equipped with good thermal stability duo to the introduction of OH‐PDMS. And, the high‐performance polyurethane elastomer has great potential in practical application.
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