Abstract Inspired by nacre's sophisticated “brick-and-mortar” structure, multilayered polyether amine (PEA)/graphene oxide (GO) hybrid building blocks were incorporated onto the surface of carbon fiber via Layer-by-Layer (LbL) assembly to strengthen and toughen the interphase of composites. Impressive improvements of 67.7% and 129.0% in interfacial strength and toughness over those of untreated fiber composites are achieved for composites with 9 layers of PEA/GO on fiber surface. The synergistic effects stemming from covalent bonds, hydrogen bonds and π-π interaction, as well as crack deflection caused by homogeneous GO layers, improved surface energy and wettability are major reasons for the increase in interfacial adhesion. The major toughening mechanisms are attributed to interfacial micro-cracks, viscoplastic energy dissipation of PEA and GO slippage. This work provides a promising route of bio-inspired structural composites with excellent strength and toughness.

中文翻译：

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碳纤维表面逐层组装的类珍珠层聚醚胺/GO分级结构向具有优异界面强度和韧性的复合材料发展

摘要 受珍珠层复杂的“实体”结构的启发，多层聚醚胺 (PEA)/氧化石墨烯 (GO) 混合构建块通过逐层 (LbL) 组装结合到碳纤维表面，以加强和使复合材料的界面增韧。对于在纤维表面具有 9 层 PEA/GO 的复合材料，界面强度和韧性比未经处理的纤维复合材料显着提高了 67.7% 和 129.0%。由共价键、氢键和 π-π 相互作用产生的协同效应，以及由均匀 GO 层引起的裂纹偏转、表面能和润湿性的提高是界面粘附力增加的主要原因。主要的增韧机制归因于界面微裂纹，PEA 和 GO 滑移的粘塑性能量耗散。这项工作为具有优异强度和韧性的仿生结构复合材料提供了一条有前途的途径。