Modelling of the thermal conductivity in polymer nanocomposites and the impact of the interface between filler and matrix

Abstract

In this paper the thermal conductivity of epoxy-based composite materials is analysed. Two- and three-phase Lewis–Nielsen models are proposed for fitting the experimental values of the thermal conductivity of epoxy-based polymer composites. Various inorganic nano- and micro- particles were used, namely aluminium oxide, aluminium nitride, magnesium oxide and silicon dioxide with average particle size between 20?nm and 20?µm. It is shown that the filler–matrix interface plays a dominant role in the thermal conduction process of the nanocomposites. The two-phase model was proposed as an initial step for describing systems containing 2 constituents, i.e. an epoxy matrix and an inorganic filler. The three-phase model was introduced to specifically address the properties of the interfacial zone between the host polymer and the surface modified nanoparticles.

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ORCID for T. Andritsch: orcid.org/0000-0002-3462-022X

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