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Electrical Engineering
Erschienen in:

08.07.2022 | Original Paper

Epoxy/graphite nanocomposites as dielectric resins with enhanced thermal conductivity

verfasst von: Renaud Metz, Lurayni Diaz-Chacon, Reinaldo Atencio, Philippe Dieudonné-George

Erschienen in: Electrical Engineering | Ausgabe 6/2022

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Abstract

Several industrial carbon fillers have been carried out to test their potential to improve the thermal conductivity of epoxy composite materials while maintaining their low electrical conductivity. Large samples (50 × 50 × 4 mm) were prepared, using an industrial high insulating anhydride cured-DGEBA epoxy resin of high viscosity (~ 8.5–15 Pa.s) and heavy molecular weight (385 g mol−1). The best results are obtained from graphite nanoplatelets GnP M: the relative increase in thermal conductivity (κcomp) reaches 100% (0.37 Wm−1 K−1) at load of 1.13 vol% while maintaining the electrical resistivity above 105 Ω m. These results are interpreted in terms of transport of acoustic phonons in a two-phase system composite. It is shown that the graphite-epoxy composite thermal conductivities can be discussed as a function on the graphite volume fraction, the graphite filler thickness (Lc), their aspect ratio and thermal boundary resistance (Rint). Rint is expressed as a function of κcomp, κf (filler intrinsic thermal conductivity), filler aspect ratio, and two constant values, one depending on the chemical bonding strength at the interface between the graphite particles and the matrix and the other depending on the filler dispersion homogeneity inside the matrix at the macroscopic scale.
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Metadaten
Titel
Epoxy/graphite nanocomposites as dielectric resins with enhanced thermal conductivity
verfasst von
Renaud Metz
Lurayni Diaz-Chacon
Reinaldo Atencio
Philippe Dieudonné-George
Publikationsdatum
08.07.2022
Verlag
Springer Berlin Heidelberg
Erschienen in
Electrical Engineering / Ausgabe 6/2022
Print ISSN: 0948-7921
Elektronische ISSN: 1432-0487
DOI
https://doi.org/10.1007/s00202-022-01595-4

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