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Carbon nanotube integrated multifunctional multiscale composites

机译：碳纳米管集成多功能多尺度复合材料

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Carbon nanotubes (CNTs) demonstrate extraordinary properties and show great promise in enhancing out-of-plane properties of traditional polymer composites and enabling functionality, but current manufacturing challenges hinder the realization of their potential. This paper presents a method to fabricate multifunctional multiscale composites through an effective infiltration-based vacuum-assisted resin transfer moulding (VARTM) process. Multi-walled carbon nanotubes (MWNTs) were infused through and between glass-fibre tows along the through-thickness direction. Both pristine and functionalized MWNTs were used in fabricating multiscale glass-fibre-reinforced epoxy composites. It was demonstrated that the mechanical properties of multiscale composites were remarkably enhanced, especially in the functionalized MWNT multiscale composites. With only 1 wt% loading of functionalized MWNTs, tensile strength was increased by 14% and Young's modulus by 20%, in comparison with conventional fibre-reinforced composites. Moreover, the shear strength and short-beam modulus were increased by 5% and 8%, respectively, indicating the improved inter-laminar properties. The strain-stress tests also suggested noticeable enhancement in toughness. Scanning electron microscopy (SEM) characterization confirmed an enhanced interfacial bonding when functionalized MWNTs were integrated into epoxy/glass-fibre composites. The coefficient thermal expansion (CTE) of functionalized nanocomposites indicated a reduction of 25.2% compared with epoxy/glass-fibre composites. The desired improvement of electrical conductivities was also achieved. The multiscale composites indicated a way to leverage the benefits of CNTs and opened up new opportunities for high-performance multifunctional multiscale composites.
机译：碳纳米管（CNT）具有非凡的性能，在增强传统聚合物复合材料的面外性能和实现功能性方面显示出巨大的希望，但是当前的制造挑战阻碍了其潜力的实现。本文提出了一种通过有效的基于渗透的真空辅助树脂传递模塑（VARTM）工艺制造多功能多尺度复合材料的方法。沿厚度方向在玻璃纤维丝束之间以及玻璃纤维束之间注入多壁碳纳米管（MWNT）。原始的和功能化的MWNT均用于制造多尺度玻璃纤维增​​强环氧复合材料。结果表明，多尺度复合材料的力学性能得到了显着提高，特别是在功能化的MWNT多尺度复合材料中。与传统的纤维增强复合材料相比，仅添加1 wt％的官能化MWNTs，拉伸强度提高了14％，杨氏模量提高了20％。此外，抗剪强度和短梁模量分别提高了5％和8％，表明层间性能得到了改善。应变测试还表明韧性显着提高。扫描电子显微镜（SEM）表征证实，当将功能化的MWNTs集成到环氧/玻璃纤维复合材料中时，界面结合增强。与环氧/玻璃纤维复合材料相比，功能化纳米复合材料的热膨胀系数（CTE）降低了25.2％。还实现了所需的电导率改善。多尺度复合材料表明了一种利用碳纳米管优势的方法，并为高性能多功能多尺度复合材料开辟了新的机遇。

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