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Tough, Recyclable, and Degradable Elastomers for Potential Biomedical Applications

机译：Tough, Recyclable, and Degradable Elastomers for Potential Biomedical Applications

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Elastomers have many industrial, medical and commercial applications,however, their huge demand raises an important question of how to disposeof the out-of-service elastomers. Ideal elastomers that are concurrently tough,recyclable, and degradable are in urgent need, but their preparation remainsa rigorous challenge. Herein, a polycaprolactone (PCL) based polyurethaneelastomer is designed and prepared to meet this demand. Owing to the presenceof dynamic coordination bond and the occurrence of strain-induced crystallization,the obtained elastomer exhibits a high toughness of ≈372 MJ m~(?3)and an unprecedented fracture energy of ≈646 kJ m~(?2), which is much higherthan natural rubber (≈50 MJ m~(?3) for toughness and ≈10 kJ m~(?2) for fractureenergy). In addition, the elastomer can be recycled at least three times usingsolvent without losing its mechanical properties and can be degraded bylipase in ≈2 months. Finally, biological experiments demonstrate that theelastomer possesses good biocompatibility and can facilitate wound healingin mice when used as sutures. It is believed that the obtained elastomermeets the requirements for next-generation elastomers and is expected tobe used in emerging fields such as biomedicine, flexible electronics, roboticsand beyond.

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