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Investigation of mechanical properties of graphene decorated with graphene quantum dot-reinforced epoxy nanocomposite

机译：石墨烯量子点加固环氧纳米复合材料装饰石墨烯力学性能研究

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摘要

In this investigation, the mechanical properties such as compression, impact, and flexural properties of graphene decorated with graphene quantum dots (GDGQD) epoxy composites with concentration of GDGQD ranging from 0.25 to 1 wt % were studied. Ideal mechanical properties are obtained by systematically varying the filler weight in the epoxy matrix. The morphological studies of GDGQD have been characterized using transmission electron microscope, X-ray diffraction, and Fourier transform infrared technique. The compression, impact, and flexural strengths were enhanced effectively by the GDGQD loading. With the addition of 0.75 wt % of GDGQD, the compressive strength, compressive modulus, flexural strength, and flexural modulus of the composites were improved by 22, 29, 31, and 63%, respectively. Also an improvement in impact strength of 102% for 0.75 wt % GDGQD epoxy sample was also obtained. Examination of fractured test specimens was performed with scanning electron microscope. The enhancement in the mechanical properties is due to the better stress transfer that is attributed by enhanced interfacial bonding between GDGQDs and the epoxy. Using the GDGQD aspect ratio in the two-dimensional randomly oriented filler modified Halpin-Tsai model, the theoretical flexural modulus for the GDGQD/epoxy composites has been established. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48680.
机译：在该研究中，研究了用石墨烯量子点（GDGQD）环氧复合材料的石墨烯的压缩，冲击和弯曲性能，浓度为0.25-1wt％的石墨烯的压缩，冲击和弯曲性能。通过系统地改变环氧基质中的填充剂重量来获得理想的机械性能。使用透射电子显微镜，X射线衍射和傅立叶变换红外技术表征了GDGQD的形态学研究。通过GDGQD负载有效地增强了压缩，冲击和弯曲强度。随着添加0.75wt％的GDGQD，复合材料的抗压强度，压缩模量，弯曲强度和抗弯模量分别升高22,29,31和63％。还得到了0.75wt％GDGQD环氧样品的影响强度为102％的改善。用扫描电子显微镜进行裂缝试样的检查。机械性能的增强是由于归因于GDGQDS与环氧树脂之间的增强的界面键合所归因的更好的应力转移。在二维随机取向填料改性卤素酸仔模型中使用GDGQD纵横比，已经建立了GDGQD /环氧复合材料的理论弯曲模量。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,137,48680。

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