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首页> 外文期刊>Journal of Applied Polymer Science >Self-healing interfaces of poly(methyl methacrylate) reinforced with carbon fibers decorated with carbon quantum dots
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Self-healing interfaces of poly(methyl methacrylate) reinforced with carbon fibers decorated with carbon quantum dots

机译：用碳纤维加固的聚（甲基丙烯酸甲酯）的自愈界面，碳纤维装饰着碳纤维

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摘要

Fiber-polymer matrix interfacial debonding is often observed when mechanical loads are applied to fiber reinforced polymer composites. These defects usually end-up leading to a catastrophic fracture of the composites. In this work, carbon quantum dots (CDs) were incorporated on the surface of carbon fibers (CF), and poly(methyl methacrylate) (PMMA) composites with these modified fibers were able to restore their original properties after been previously damaged. To this end, CDs were synthesized and used to decorate the surface of CF. These decorated CF were then incorporated into PMMA by using a high intensity mixer. The prepared composites were submitted to dynamic mechanical, three-point bending and self-healing tests. Fluorescent CDs with diameters of 10 nm and functional groups, such as amine and carboxylic groups were successfully synthesized by the microwave pyrolysis method. The deposition of CDs on the surface of CF was evaluated and quantified by UV-vis spectroscopy and 1.2 wt.% of CDs on CF was determined. Composites with different surface treatments (including the presence of CD) did not show significant differences in strength, stiffness and damping, suggesting that the surface treatments on CF did not lead to major changes in the degree of interfacial interaction. Self-healing tests showed that damaged composites with CD decorated CF were able to restore their original properties, while no self-healing effect was noted in composites with no CD on CF. The observed self-healing behavior between PMMA and CF decorated with CD is due to the interactions between chemical groups on the surface of the CD and PMMA. Thus, damages related to fiber-matrix interfacial detachments can be repaired through reversible interactions based on CD.
机译：在对纤维增强聚合物复合材料施加机械载荷时，经常会出现纤维-聚合物基体界面脱粘现象。这些缺陷通常会导致复合材料的灾难性断裂。在这项工作中，碳量子点（Cd）被加入到碳纤维（CF）的表面上，并且含有这些改性纤维的聚甲基丙烯酸甲酯（PMMA）复合材料能够在先前受损后恢复其原始性能。为此，合成了CDs，并将其用于装饰CF的表面。然后使用高强度混合器将这些装饰过的CF并入PMMA中。制备的复合材料进行了动态力学、三点弯曲和自愈合试验。采用微波热解法成功地合成了直径为10nm的荧光CDs和氨基、羧基等官能团。通过紫外-可见光谱对CDs在CF表面的沉积进行评估和量化，并测定CDs在CF上的1.2 wt.%。不同表面处理（包括CD的存在）的复合材料在强度、刚度和阻尼方面没有表现出显著差异，这表明CF表面处理不会导致界面相互作用程度的重大变化。自愈合试验表明，CD修饰CF的受损复合材料能够恢复其原有的性能，而CD修饰CF的复合材料没有自愈合效应。观察到的PMMA和CD修饰CF之间的自愈行为是由于CD和PMMA表面化学基团之间的相互作用。因此，与纤维-基体界面分离相关的损伤可以通过基于CD的可逆相互作用进行修复。

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