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However, in practical applications, it is often subjected to extreme environmental conditions, such as repeated cyclic mechanical loading, high temperatures, external impacts, etc. Designing an elastomer with high strength\/toughness and resistant to fatigue is particularly challenging. Herein, a novel polyurethane elastomer is developed, consisting of ascorbic acid\u2010based chemodynamic covalent adaptive networks (A\u2010CCANs). The keto\u2010enol dynamic chemistry and dynamic carbamate bonds within A\u2010CCANs endow the elastomer with unprecedented thermostability (thermal decomposition temperature up to 345\u00a0\u00b0C, comparable to well\u2010known PTFE), excellent mechanical properties (true fracture stress reaches 0.88\u00a0GPa) and impact resistance (able to withstand a stress of 268.3\u00a0MPa when the surface is compressed to 99.9%, while absorbing 68.93\u00a0MJ\u00a0m<jats:sup>\u22123<\/jats:sup> of energy), as well as sterling fatigue resistance (residual strain less than 0.02 after 20\u00a0000 cycles). Besides, A\u2010CCANs also feature rapid (\u223c1 s) self\u2010healing capability and reprocessability (recycling efficiency up to 90%). This study provides new ideas for compromising between the stability and responsiveness of polymers, which have groundbreaking significance in engineering applications such as smart devices and structural materials.<\/jats:p>","DOI":"10.1002\/smll.202505297","type":"journal-article","created":{"date-parts":[[2025,8,23]],"date-time":"2025-08-23T08:01:39Z","timestamp":1755936099000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Polyurethane Elastomer with Unprecedented Thermostability, Long\u2010Cycle Antifatigue, and Ultrafast Self\u2010Healing Capability"],"prefix":"10.1002","volume":"21","author":[{"given":"Chang","family":"Xu","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Beijing Institute of Technology  NO.5 South Zhongguancun Street, Haidian District Beijing 100081 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