Role of fibre–matrix interface and fibre direction on dielectric behaviour of epoxy composites

The aim of this paper is to show the influence of fibres and fibre orientation on dielectric behaviour of glass fibre reinforced polymer. The Scanning Electron Microscope Mirror Effect (SEMME) associated with the Ground Current measurement were used to determine the ability of trapping and motion of electric charges inside insulating materials. The role of the fibre/matrix interface nature seems to be essential for either trapping or diffusion of charges and consequently for localisation or spreading of stored polarisation energy which can induce, from the mechanical point of view, brittleness of interface.