Efficient design of electromagnetic (EM) shielding materials has emerged as a challenging research area in the past decade. To address this issue, we propose thin, lightweight, yet strong epoxy/carbon fiber (CF) composites modified with functionalized graphene oxide (GO) sheets as “interconnects”. This strategy resulted in an impressive 175% improvement in the storage modulus, a 100% enhancement in the lap shear strength, and an extraordinary 200% improvement in the shielding effectiveness at a very low GO content (0.5 wt %). First, GO was functionalized with an epoxy prepolymer (namely E-f-GO) to improve the interfacial adhesion with the matrix polymer, epoxy. As a control, epoxy nanocomposites were also prepared with modified GO. It was followed by the fabrication of CF laminates impregnated with epoxy nanocomposites. Covalent functionalization of epoxy chains on GO sheets was confirmed using various techniques like X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, and thermogravimetric analysis. Epoxy nanocomposites were analyzed for thermal, mechanical, electrical, and adhesive strength behavior. CF laminates with epoxy nanocomposites were fabricated using vacuum-assisted resin transfer molding. The E-f-GO/epoxy/CF composite exhibited an excellent shielding effectiveness value of −70 dB, and the storage modulus was found to be >40 GPa. The modified composite showed absorption-driven shielding of EM waves and hence can be used as a highly effective EM absorber.

中文翻译：

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通过环氧树脂接枝的石墨烯“互连”极大地改善了机械性能和吸收驱动的微波屏蔽

在过去的十年中，电磁（EM）屏蔽材料的高效设计已成为一个具有挑战性的研究领域。为了解决这个问题，我们建议使用功能化的氧化石墨烯（GO）片改性的薄，重量轻但强度高的环氧/碳纤维（CF）复合材料作为“互连体”。该策略导致在非常低的GO含量（0.5 wt％）下，储能模量显着提高了175％，搭接剪切强度提高了100％，屏蔽效果显着提高了200％。首先，GO用环氧预聚物（即Ef-GO）官能化，以改善与基体聚合物环氧树脂的界面粘合性。作为对照，还用改性的GO制备了环氧纳米复合材料。随后制造浸渍有环氧纳米复合材料的CF层压板。使用各种技术（例如X射线衍射，拉曼光谱，傅里叶变换红外光谱，原子力显微镜和热重分析）证实了GO片上环氧链的共价官能化。分析了环氧树脂纳米复合材料的热，机械，电气和粘合强度行为。使用真空辅助树脂传递模塑技术制造了具有环氧纳米复合材料的CF层压板。Ef-GO /环氧树脂/ CF复合材料表现出出色的屏蔽效果值-70 dB，储能模量> 40 GPa。改性的复合材料表现出吸收驱动的电磁波屏蔽，因此可以用作高效的电磁吸收剂。傅里叶变换红外光谱，原子力显微镜和热重分析。分析了环氧树脂纳米复合材料的热，机械，电气和粘合强度行为。使用真空辅助树脂传递模塑技术制造了具有环氧纳米复合材料的CF层压板。Ef-GO /环氧树脂/ CF复合材料表现出出色的屏蔽效果值-70 dB，储能模量> 40 GPa。改性的复合材料表现出吸收驱动的电磁波屏蔽，因此可以用作高效的电磁吸收剂。傅里叶变换红外光谱，原子力显微镜和热重分析。分析了环氧树脂纳米复合材料的热，机械，电气和粘合强度行为。使用真空辅助树脂传递模塑技术制造了具有环氧纳米复合材料的CF层压板。Ef-GO /环氧树脂/ CF复合材料表现出出色的屏蔽效果值-70 dB，储能模量> 40 GPa。改性的复合材料表现出吸收驱动的电磁波屏蔽，因此可以用作高效的电磁吸收剂。Ef-GO /环氧树脂/ CF复合材料表现出出色的屏蔽效果值-70 dB，储能模量> 40 GPa。改性的复合材料表现出吸收驱动的电磁波屏蔽，因此可以用作高效的电磁吸收剂。Ef-GO /环氧树脂/ CF复合材料表现出出色的屏蔽效果值-70 dB，储能模量> 40 GPa。改性的复合材料表现出吸收驱动的电磁波屏蔽，因此可以用作高效的电磁吸收剂。