在碳纤维表面构建多孔结构同时强化和增韧复合材料界面,ACS Applied Materials & Interfaces

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在碳纤维表面构建多孔结构同时强化和增韧复合材料界面
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-12-28 , DOI: 10.1021/acsami.2c18632
Xiaoming Chen ₁ , Yaozu Hui ₁ , Siyi Cheng ₁ , Kaiqiang Wen ₁ , Jie Zhang ₂ , Jiangbin Zhang ₁ , Yijie Wang ₁ , Xin Wang ₁ , Baotong Li ₃ , Jinyou Shao ₁

Affiliation

对纤维增强复合材料的强度和韧性的需求是永恒的。不幸的是，这两个属性通常是相互排斥的。由于复合材料的机械性能高度依赖于它们的界面性能，因此纤维和基体之间的工程界面对于克服强度和韧性之间的冲突至关重要。在此，受草根增强土壤复合材料的物理界面结构的启发，多孔碳纳米管-Mg(OH) ₂通过水电解反应和电泳沉积工艺在纤维表面构建/MgO杂化结构。研究了多孔结构对纤维长丝的机械性能以及厚度对界面性能的影响。结果表明，纤维表面完全覆盖的多孔结构通过桥接纤维上的表面缺陷，略微提高了单根纤维在机械性能方面的可靠性。多孔结构包覆纤维/树脂复合材料的界面剪切强度和韧性分别达到92.3 MPa和121.2 J/m ²，分别。这些值分别比原始纤维/树脂复合材料高 61.30% 和 121.98%。强化效应归因于改善众多界面结合区域和机械互锁形态的协同效应。增韧机制与界面破坏过程中多孔结构的裂纹偏转、微裂纹产生和断裂有关。通过有限元分析进行的额外数值研究进一步证明了增强机制。总的来说，所提出的方法看起来很有希望生产出具有优异强度和韧性的先进碳纤维增强聚合物复合材料。

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Constructing a Porous Structure on the Carbon Fiber Surface for Simultaneously Strengthening and Toughening the Interface of Composites

The demand for both strength and toughness is perpetual in fiber-reinforced composites. Unfortunately, both properties are often mutually exclusive. As the mechanical properties of the composites are highly dependent on their interfacial properties, engineering interfaces between the fiber and matrix would be vital to overcome the conflict between strength and toughness. Herein, inspired by the physical interfacial architecture of grassroots-reinforced soil composites, a porous carbon nanotube–Mg(OH)₂/MgO hybrid structure was constructed on the fiber surface via water electrolysis reaction and electrophoretic deposition process. The effects of the porous structure on the fiber filaments’ mechanical properties, as well as the thickness on the interfacial properties, were all investigated. The results showed that fully covered porous structures on the fiber surface slightly enhanced the reliability of a single fiber in terms of mechanical properties by bridging the surface defects on the fiber. The interfacial shear strength and toughness of the porous structure-coated fiber/resin composite reached up to 92.3 MPa and 121.2 J/m², respectively. These values were 61.30 and 121.98% higher than those of pristine fiber/resin composites, respectively. The strengthening effect was ascribed to the synergistic effects that improved numerous interfacial bonding areas and mechanical interlocking morphologies. The toughening mechanism was related to crack deflection, microcrack generation, and fracture of the porous structure during interfacial failure. Additional numerical studies by finite element analysis further proved the enhancement mechanism. Overall, the proposed method looks promising for producing advanced carbon fiber-reinforced polymer composites with excellent strength and toughness.

更新日期：2022-12-28

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