Ageing phenomena in isotropic conductive adhesive material investigated by experimental and simulation techniques

Abstract

In this work we present our results of an approach to assess material property changes with time due to high temperature ageing in an isotropic conductive adhesive. A molecular model of an epoxy with similar primary chemistry is investigated by molecular dynamics simulations. By variation of crosslink density, one supposed effect of ageing (post-curing) is investigated with respect to its impact on diffusivity of water molecules and the free volume of the epoxy matrix. In a simple submodel of a composite material, the portability of the results into FE simulations and their validity are discussed by comparison to experimental results