Processing-structure-multi-functional property relationship in carbon nanotube/epoxy composites
Processing-structure-multi-functional property relationship in carbon nanotube/epoxy composites
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DOI：
10.1016/j.carbon.2006.05.014
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发表时间：
2006-11-01
期刊：
影响因子：
10.9
通讯作者：
Chou, Tsu-Wei
中科院分区：
文献类型：
--
作者：
Thostenson, Erik T.;Chou, Tsu-Wei
碳纳米管的新颖特性引起了人们对纳米管增强聚合物复合材料开发的科学和技术兴趣。为了在多功能材料系统中利用纳米管，开发适合大批量、高速率生产的加工技术至关重要。在这项研究中，我们研究了一种可扩展的压延方法，通过强烈的剪切混合实现 CVD 生长的多壁碳纳米管的分散。利用电子显微镜研究制造过程中微米和纳米级结构的演变，并优化生产高分散纳米复合材料的加工条件。制定加工方案后，用不同的增强比例加工纳米管/环氧树脂复合材料，并评估断裂韧性和电/热传输性能。加工后的纳米复合材料在低纳米管浓度下表现出显着增强的断裂韧性。加工后的复合材料中碳纳米管的高长径比能够在浓度低于 0.1%（重量）时形成导电渗滤网络。热导率随纳米管浓度线性增加，在碳纳米管含量为 5 wt.% 时最大增加 60%。 (c) 2006 Elsevier Ltd. 保留所有权利。
The novel properties of carbon nanotubes have generated scientific and technical interest in the development of nanotube-reinforced polymer composites. In order to utilize nanotubes in multi-functional material systems it is crucial to develop processing techniques that are amenable to scale-up for high volume, high rate production. In this research we investigate a scalable calendering approach for achieving dispersion of CVD-grown multi-walled carbon nanotubes through intense shear mixing. Electron microscopy was utilized to study the micro and nanoscale structure evolution during the manufacturing process and optimize the processing conditions for producing highly-dispersed nanocomposites. After processing protocols were established, nanotube/epoxy composites were processed with varying reinforcement fractions and the fracture toughness and electrical/thermal transport properties were evaluated. The as-processed nanocomposites exhibited significantly enhanced fracture toughness at low nanotube concentrations. The high aspect ratios of the carbon nanotubes in the as-processed composites enabled the formation of a conductive percolating network at concentrations below 0.1% by weight. The thermal conductivity increased linearly with nanotube concentration to a maximum increase of 60% at 5 wt.% carbon nanotubes. (c) 2006 Elsevier Ltd. All rights reserved.