Enhanced Mechanical Properties of Nanocomposites at Low Graphene Content
Enhanced Mechanical Properties of Nanocomposites at Low Graphene Content
复制标题
DOI：
10.1021/nn9010472
复制
发表时间：
2009-12-01
期刊：
影响因子：
17.1
通讯作者：
Koratkar, Nikhil
中科院分区：
文献类型：
--
作者：
Rafiee, Mohammad A.;Rafiee, Javad;Koratkar, Nikhil
在这项研究中，比较了纳米填料质量分数为0.1+/-0.002%时，含石墨烯片层、单壁碳纳米管和多壁碳纳米管添加剂的环氧树脂纳米复合材料的力学性能。测试的力学性能包括杨氏模量、极限抗拉强度、断裂韧性、断裂能和材料的抗疲劳裂纹扩展能力。结果表明，石墨烯微片的性能明显优于碳纳米管添加剂。与单壁碳纳米管相比，石墨烯纳米复合材料的杨氏模数增加了31%，而石墨烯纳米复合材料的杨氏模数增加了31%。与多壁碳纳米管类似的14%的提高相比，石墨烯片材的基线环氧树脂的拉伸强度提高了40%。与多壁碳纳米管相比，石墨烯片状纳米复合材料的I型断裂韧性提高了53%，而多壁碳纳米管的I型断裂韧性提高了20%。疲劳抗力结果也呈现出明显不同的变化趋势。随着应力强度因子幅值的增加，纳米管/环氧复合材料的疲劳抑制响应显著降低，而石墨烯基纳米复合材料的疲劳抑制响应则相反。石墨烯微片在力学性能方面优于碳纳米管，这可能与其高比表面积、因其起皱(粗糙)表面而增强的纳米填料-基质粘附性/互锁以及石墨烯微片的二维(平面)几何结构有关。
In this study, the mechanical properties of epoxy nanocomposites with graphene platelets, single-walled carbon nanotubes, and multi-walled carbon nanotube additives were compared at a nanofiller weight fraction of 0.1 +/- 0.002%. The mechanical properties measured were the Young's modulus, ultimate tensile strength, fracture toughness, fracture energy, and the material's resistance to fatigue crack propagation. The results indicate that grapheme platelets significantly out-perform carbon nanotube additives. The Young's modulus of the graphene nanocomposite was similar to 31% greater than the pristine epoxy as compared to similar to 3% increase for single-walled Carbon nanotubes. The tensile strength of the baseline epoxy was enhanced by similar to 40% with graphene platelets compared to similar to 14% improvement for multi-walled carbon nanotubes. The mode I fracture toughness of the nanocomposite with graphene platelets showed similar to 53% increase over the epoxy compared to similar to 20% improvement for multi-walled carbon nanotubes. The fatigue resistance results also showed significantly different trends. While the fatigue suppression response of nanotube/epoxy composites degrades dramatically as the stress intensity factor amplitude is increased, the reverse effect is seen for graphene-based nanocomposites. The superiority of graphene platelets over carbon nanotubes in terms of mechanical properties enhancement may be related to their high specific surface area, enhanced nanofiller-matrix adhesion/interlocking arising from their wrinkled (rough) surface, as well as the two-dimensional (planar) geometry of graphene platelets.