Temperature-Dependent Effective Electrical Conductivity of Carbon Nanotube-Epoxy Nanocomposites: A Semi-Analytical Model

Antonio Avila, Olesya Zhupanska

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The semi-Analytical model for predicting electrical conductivity of carbon nanotubes based composites developed by Deng and Zheng [15] was extended to high temperatures. To be able to apply such model to temperatures up to 800 C, correlations coefficients were examined under the thermogravimetric analysis perspective. Four different heating rates (10 Co/min, 20 Co/min, 40 Co/min, and 50 Co/min) and four CNT/epoxy compositions (control sample, 0.5 wt. %, 1.0 wt. %, and 2.0 wt. %) were investigated. As carbon nanotubes have the tendency to agglomerate a morphological study was performed using Atomic Force Microscopy. The investigation revealed no major agglomerations and a good spatial dispersion. The TGA data were treated considering the reacted fraction as function of the absolute temperature. Two different coefficients were proposed based on reacted fraction, activation energy, and the rate of reaction. The semi-Analytical expressions are physically related to the thermal degradation phenomenon, including the carbon nanotubes de-percolation effect. The model is continuous on temperature and reacted fraction, but it is discrete on CNT concentration. The model seems to capture the physical phenomenon of thermal decomposition all three main phases with accuracy.

Original languageEnglish (US)
Title of host publication33rd Technical Conference of the American Society for Composites 2018
PublisherDEStech Publications Inc.
Pages3074-3086
Number of pages13
ISBN (Electronic)9781510872073
StatePublished - 2018
Externally publishedYes
Event33rd Technical Conference of the American Society for Composites 2018 - Seattle, United States
Duration: Sep 24 2018Sep 27 2018

Publication series

Name33rd Technical Conference of the American Society for Composites 2018
Volume5

Other

Other33rd Technical Conference of the American Society for Composites 2018
Country/TerritoryUnited States
CitySeattle
Period9/24/189/27/18

ASJC Scopus subject areas

  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Metals and Alloys

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