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Synergistic effect of functionalized graphene oxide and carbon nanotube hybrids on mechanical properties of epoxy composites

机译：功能化氧化石墨烯和碳纳米管杂化物对环氧复合材料力学性能的协同效应

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摘要

Epoxy resin was grafted to graphene oxide (GO) via esterification reaction and 3D structure hybrids were prepared by combining 1D carbon nanotube (CNT) and 2D functionalized GO through π-stacking interaction. Epoxy composites filled with 3D structure hybrids were fabricated. The results show that functionalized GO effectively improves the dispersibility of CNTs in epoxy matrix due to good compatibility. Excellent mechanical properties were achieved by epoxy composites filled with 3D structure hybrids. The fracture surface analysis indicated improved interfacial interaction between 3D structure hybrids and epoxy matrix, which may due to the covalent bonding formed between the epoxy molecular chain grafted on EGO and the hardener agent during the curing process. In the 3D structure filler network, the mechanisms of crack deflection/bifurcation induced by functionalized GO make the crack path tortuous, which causes the cracks to encounter more CNTs and then promote the mechanisms of CNT fracture and crack bridging, resulting in more energy dissipation. This is the key mechanism for its excellent reinforcing and toughening effects.
机译：通过酯化反应将环氧树脂接枝到氧化石墨烯（GO）上，并通过π堆叠相互作用将1D碳纳米管（CNT）和2D功能化的GO结合在一起，从而制备3D结构杂化体。制备了填充有3D结构混合材料的环氧树脂复合材料。结果表明，官能化的GO具有良好的相容性，可有效提高CNT在环氧基质中的分散性。通过填充3D结构混合材料的环氧树脂复合材料，可以获得出色的机械性能。断裂表面分析表明3D结构杂化体与环氧基质之间的界面相互作用得到了改善，这可能是由于在固化过程中在EGO上接枝的环氧分子链与固化剂之间形成了共价键。在3D结构填充物网络中，功能化GO引起的裂纹偏转/分叉机制使裂纹路径曲折，使裂纹遇到更多的CNT，进而促进CNT断裂和裂纹桥接的机制，从而导致更多的能量耗散。这是其出色的增强和增韧效果的关键机制。

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