Achieving mechanical robustness and highly efficient self-healing simultaneously at room temperature is always a formidable challenge for polymeric materials. Herein, a series of novel supramolecular polyurethane elastomers (SPUEs) are developed by incorporating dynamic covalent boronic ester and boron–nitrogen (B–N) coordination. The SPUEs demonstrate the highest tensile toughness (∼182.2 MJ m⁻³) to date for room-temperature self-healable polymers, as well as an excellent ultimate tensile strength (∼10.5 MPa) and ultra-high fracture energy (∼72 100 J m⁻²), respectively, owing to a synergetic quadruple dynamic mechanism. It is revealed that the B–N coordination not only facilitates the formation and dissociation of boronic ester at room temperature but also dramatically enhances the mechanical properties by the intermolecular coordinated chain crosslinking and intramolecular coordinated chain folding. Meanwhile, the B–N coordination and urethane hydrogen interaction also serve as sacrificial bonds, which rupture during stretching to dissipate energy and recover after release, leading to superior notch insensitiveness and recoverability. The SPUEs restore their mechanical robustness after self-healing at room temperature and the self-healing efficiency can be dramatically accelerated by surface wetting.

中文翻译：

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动态共价硼酸酯和硼-氮配位之间的协同作用：室温下自修复聚氨酯弹性体的策略，具有前所未有的机械性能

在室温下同时实现机械稳健性和高效自愈一直是聚合物材料面临的巨大挑战。在此，通过结合动态共价硼酸酯和硼氮 (B-N) 配位，开发了一系列新型超分子聚氨酯弹性体 (SPUE)。SPUE 表现出迄今为止室温自修复聚合物最高的拉伸韧性（~182.2 MJ m ^-3），以及出色的极限拉伸强度（~10.5 MPa）和超高断裂能（~72 100 J米^-2)，分别是由于协同的四重动态​​机制。结果表明，B-N配位不仅促进了室温下硼酸酯的形成和解离，而且通过分子间配位链交联和分子内配位链折叠显着提高了机械性能。同时，B-N配位和氨基甲酸酯氢相互作用也作为牺牲键，在拉伸过程中断裂以耗散能量并在释放后恢复，导致优异的缺口不敏感和可恢复性。SPUE 在室温下自愈后恢复其机械强度，并且表面润湿可以显着提高自愈效率。