Front Cover: In article number 2000273, Xiaode Guo and co‐workers report a self‐healing polyurethane material. Disulfide bonds are introduced into the hard part of the polymer chain to provide self‐healing properties for the material. The polyurethane material has excellent self‐healing perfprmance and acid‐base resistance. The stress self ‐healing can reach more than 90%, and the scratch self‐healing effect is remarkable. The self‐healing polyurethane material is applied to metal surface coating, and the coating is tested to have excellent selfhealing ability and acid‐base resistance. This work has certain significance for the research of self‐healing coating materials.

中文翻译：

---

具有优异的自修复性能和稳定性的热固性聚氨酯，用于金属表面涂层

前封面：郭小德及其同事在文章编号2000273中报告了一种可自我修复的聚氨酯材料。二硫键被引入到聚合物链的硬部分，以提供材料的自愈特性。聚氨酯材料具有出色的自修复性能和耐酸碱性能。应力自修复可达到90％以上，刮擦自修复效果显着。自修复聚氨酯材料应用于金属表面涂层，经测试该涂层具有出色的自修复能力和耐酸碱性。这项工作对自愈涂层材料的研究具有一定的意义。