Discontinuity of physical properties of carbon nanotube/polymer composites at the percolation threshold

Abstract : Evolution of DC conductivity with double-walled carbon nanotube concentration in a polyamide 11 matrix displays the electrical percolation phenomenon. The percolation threshold is observed for this composite at 0.85 wt.%. Thermal, mechanical and dielectric manifestations of the glass transition have been investigated as a function of carbon nanotube content. Thermal and mechanical analyses have shown a depression of the glass transition temperature or its mechanical manifestation at the percolation threshold. Regarding the dielectric modulus, three distinct behaviors (below, at, and above percolation threshold) have been observed. A discussion about the interactions between the polymer matrix and the conductive fillers will be proposed to further the understanding of the discontinuity of physical properties at the percolation threshold.
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Delphine Carponcin, Eric Dantras, Jany Dandurand, Gwenaëlle Aridon, Franck Levallois, et al.. Discontinuity of physical properties of carbon nanotube/polymer composites at the percolation threshold. Journal of Non-Crystalline Solids, Elsevier, 2014, vol. 392-393, pp. 19-25. ⟨10.1016/j.jnoncrysol.2014.03.022⟩. ⟨hal-00992184⟩

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