Elastomers are widely used in daily life; however, the preparation of degradable and recyclable elastomers with high strength, high toughness, and excellent crack resistance remains a challenging task. In this report, a polycaprolactone‐based poly(urethane‐urea) elastomer is presented with excellent mechanical properties by optimizing the arrangement of hard segment clusters. It is found that long alkyl chains of the chain extenders lead to small and evenly distributed hard segment clusters, which is beneficial for improving mechanical properties. Together with the multiple hydrogen bond structure and stress‐induced crystallization, the obtained elastomer exhibits a high strength of 63.3 MPa, an excellent toughness of 431 MJ m−3 and an outstanding fracture energy of 489 kJ m−2, while maintaining good recyclability and degradability. It is believed that the obtained elastomer holds great promise in various application fields and it contributes to the development of a sustainable society.

中文翻译：

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高性能聚氨酯-脲弹性体硬链段簇结构的调控

弹性体在日常生活中应用广泛；然而，制备具有高强度、高韧性和优异抗裂性的可降解和可回收弹性体仍然是一项具有挑战性的任务。在本报告中，通过优化硬链段簇的排列，聚己内酯基聚（聚氨酯-脲）弹性体呈现出优异的机械性能。研究发现，扩链剂的长烷基链导致硬链段簇小且分布均匀，有利于提高机械性能。加上多重氢键结构和应​​力诱导结晶，所得弹性体表现出 63.3 MPa 的高强度和 431 MJ m 的优异韧性−3断裂能高达 489 kJ m−2，同时保持良好的可回收性和可降解性。相信所获得的弹性体在各个应用领域具有广阔的前景，并为可持续社会的发展做出贡献。