Carbon nanotube-graphene nanoplatelet hybrids as high-performance multifunctional reinforcements in epoxy composites
Carbon nanotube-graphene nanoplatelet hybrids as high-performance multifunctional reinforcements in epoxy composites
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DOI：
10.1016/j.compscitech.2012.11.015
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发表时间：
2013-01-24
影响因子：
9.1
通讯作者：
Bai, Jinbo
中科院分区：
文献类型：
--
作者：
Li, Weikang;Dichiara, Anthony;Bai, Jinbo
将生长在石墨烯纳米片(GNPs)上的碳纳米管(CNTs)组成的杂化填料分散到环氧树脂中，作为一种有前途的增强材料。CNT-GNP/环氧复合材料在原位监测不可逆永久变形开始时表现出独特的自感知行为。研究表明，将碳纳米管-GNP杂化材料嵌入到纯环氧树脂中，使碳纳米管和GNPs具有最佳的分散性，并改善了碳填料与基体之间的界面粘附性，从而显著提高了载荷传递效果。在超低混杂载荷下(0.5wt.%)，CNT-GNP/环氧复合材料的力学性能得到显著提高。与纯净的环氧树脂相比，拉伸强度提高约36%，拉伸强度提高约40%。研究发现，CNT-GNP杂化材料的增强效率优于用改进的Halpin-Tsai模型预测的CNT+GNP杂化材料的增强效率。随着残余应变和不可逆变形的出现，CNT-GNP/环氧复合材料的原位电阻先增大到最大值，然后开始减小，这与随机取向的碳纳米管填充复合材料在发生灾难性断裂之前只是单调地增加电阻有明显的不同。(C)2012爱思唯尔有限公司。保留所有权利。
Hybrid fillers composed of carbon nanotubes (CNTs) grown on graphene nanoplatelets (GNPs) were dispersed into epoxy matrix to serve as promising reinforcements. And the CNT-GNP/epoxy composite shows distinctive self-sensing behavior for in situ monitoring the onset of irreversibly permanent deformation. Here it has been established that the embedding of CNT-GNP hybrids into pristine epoxy endows optimum dispersion of CNTs and GNPs as well as better interfacial adhesion between the carbon fillers and matrix, which results in a significant improvement in load transfer effectiveness. Remarkably enhanced mechanical properties in the CNT-GNP/epoxy composite were achieved at ultralow hybrid loading (0.5 wt.%). The tensile modulus showed similar to 40% increase and the tensile strength was enhanced by similar to 36% with respect to the neat epoxy. The reinforcement efficiency of the CNT-GNP hybrids is found to outperform that of the CNT + GNP mixture predicted using the modified Halpin-Tsai modeling. The in situ electrical resistance of the CNT-GNP/epoxy composite initially increases to its maximum value and then begins to decrease with the appearance of residual strain and irreversible deformation, which is remarkably different from the randomly oriented CNTs filled composites only with monotonic increase of the resistance until their catastrophic fracture. (c) 2012 Elsevier Ltd. All rights reserved.