Front Cover: In article number 2000527 by Faai Zhang and co‐workers, a crosslinked polymer blend based on a urethane‒arcylate system with a combination of reversibly noncovalent intrachain and interchain hydrogen bonds and dynamically covalent urea bonds is developed through a facile in situ photoinduced copolymerization. The materials exhibit rapid self‐healing at mild conditions (70 °C, 30 min), extreme toughness (≈34.76 MJ m⁻³), high tensile strength, superior stretchability, long‐term stability, recyclability, and weldability.

中文翻译：

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具有可调自修复和物理性能的机械稳定的动态脲基交联聚合物共混物

前盖：Faai Zhang及其同事的文章编号2000527中，是通过一种简便的原位光诱导方法开发的一种基于氨基甲酸酯/丙烯酸酯体系的交联聚合物共混物，该体系具有可逆非共价链内和链间氢键以及动态共价尿素键的组合共聚。这些材料在温和的条件下（70°C，30分钟）表现出快速的自我修复，极高的韧性（≈34.76MJ m ^-3），高拉伸强度，优异的拉伸性，长期稳定性，可回收性和可焊接性。