Journal
COMPOSITES PART B-ENGINEERING
Volume 56, Issue -, Pages 611-620Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2013.08.032
Keywords
Nano-structures; Polymer-matrix composites (PMCs); Electrical properties; Thermal properties; Carbon nanotubes
Funding
- United States Air Force AFRL Minority Leaders Program
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The electrical and thermal conductivity of pristine, oxidized, and fluorinated single-wall/multi-wall carbon nanotube (CNT) mixtures, dispersed in epoxy, were investigated as a function of CNT concentration. The effect of fabrication parameters, such as stirring rate and degree of epoxy pre-curing, on CNT dispersion was analyzed. The electrical conductivity increased by 10 and 6 orders of magnitude for pristine and oxidized CNT composites, respectively, relative to neat epoxy, while fluorinated CNT composites showed no increase in electrical conductivity. An increase of up to 5.5% was observed in thermal conductivity for pristine CNT composites while oxidized and fluorinated CNTs provide less enhancement in thermal conductivity. A micromechanics model, based on the composite cylinders method, was implemented to study the electrical and thermal conductivity of these composites. Effects in electrical and thermal conduction, such as electron hopping and thermal interface resistance, respectively, were incorporated into the model to accurately simulate the acquired experimental results. (C) 2013 Elsevier Ltd. All rights reserved.
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