Advanced epoxy (EP)-based composites, retaining excellent physical and mechanical properties, are in demand in many high-end devices, such as fan blades of aeroengines. However, the irreconcilable conflict between stiffness and toughness within an EP often leads to catastrophic brittle fracture. Herein, inspired by the medulla skeleton of wing feathers of Milvus migrans, bioinspired EP-based composites (BECs) were obtained via integrating functionalized three-dimensional interconnected skeleton into a brittle EP. The BEC’s fracture toughness is enhanced by 111.43%. Significantly, the maximum fracture toughness (K_JC) of the BEC is 3.5 times greater than that of the EP. Moreover, under 100 mW/cm² irradiation, the BEC can be heated from room temperature to 90 °C in 5 min, exhibiting excellent photothermal conversion capacity. The BEC expands the possible applications of conventional EP-based composites in engineering materials and energy management fields. The proposed bioinspired strategy provides a new avenue to design novel EP-based composites with strong mechanical properties and multifunction integration.

中文翻译：

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用于光热转换应用的高韧性环氧树脂基复合材料，具有仿生三维互连骨架


基于高级环氧树脂 （EP） 的复合材料保持了优异的物理和机械性能，在许多高端设备中都有需求，例如航空发动机的风扇叶片。然而，EP 内部刚度和韧性之间不可调和的冲突通常会导致灾难性的脆性断裂。本文受 Milvus migrans 翅羽髓质骨骼的启发，通过将功能化的三维互连骨骼集成到脆性 EP 中，获得了基于生物启发的 EP 复合材料 （BEC）。BEC 的断裂韧性提高了 111.43%。值得注意的是，BEC 的最大断裂韧性 （K_JC） 是 EP 的 3.5 倍。此外，在 100 mW/cm² 的照射下，BEC 可以在 5 分钟内从室温加热到 90 °C，表现出优异的光热转换能力。BEC 扩展了传统 EP 基复合材料在工程材料和能源管理领域的可能应用。所提出的生物启发策略为设计具有强大机械性能和多功能集成的新型 EP 基复合材料提供了一条新途径。