High-performance elastomers that possess a combination of high mechanical toughness and fast healability have garnered extensive interest because of their diverse application potential. Inspired by the unique multiple hydrogen bond (H-bond) structure of spider silk and the rapid dynamic exchange of hindered urea bonds (HUBs), a self-healing polyurea elastomer with ultrahigh toughness was designed by incorporating dynamic sextuple H-bonds and HUBs into the polymer chain. Such a design affords high stretchability (1586%), excellent toughness (45.53 MJ m^–3), good self-healing efficiency (91.6%), fracture energy (39.68 kJ m^–2), and recyclability. The high mechanical performance and good healability are attributed to the presence of reversibly cross-linked noncovalent sextuple H-bonds and dynamically covalent HUBs, which have been validated by stress relaxation tests. Meanwhile, by substituting the chain extender adipic dihydrazide with hexamethylenediamine, which possesses a comparable structure but fewer amide bonds, the effect of sextuple H-bonds on elastomers was confirmed. More importantly, when a conductive layer of graphene oxide was applied to the surface of the resulting elastomer, the elastomers exhibited potential applications in strain sensors.

中文翻译：

---

具有动态六重氢键的高韧性和本质自修复交联聚脲弹性体

兼具高机械韧性和快速修复性的高性能弹性体因其多样化的应用潜力而引起了广泛的兴趣。受蜘蛛丝独特的多重氢键（H-bond）结构和受阻脲键（HUB）快速动态交换的启发，通过将动态六重氢键和HUB结合到聚合物中，设计了一种具有超高韧性的自修复聚脲弹性体。聚合物链。这种设计具有高拉伸性（1586%）、优异的韧性（45.53 MJ m ^–3）、良好的自愈效率（91.6%）、断裂能（39.68 kJ m ^–2）和可回收性。高机械性能和良好的可愈合性归因于可逆交联的非共价六重氢键和动态共价 HUB 的存在，这已通过应力松弛测试得到验证。同时，通过用结构相似但酰胺键较少的己二胺替代扩链剂己二酰肼，证实了六重氢键对弹性体的影响。更重要的是，当氧化石墨烯导电层应用于所得弹性体的表面时，弹性体在应变传感器中表现出潜在的应用。