Influence of the temperature on the properties of microcomposite nano-filled epoxy

This work deals with the study of the physical properties of solid dielectric materials intended for the applications of the electrical engineering. In order to improve these properties, it is allowed today that the incorporation of nanoloads in these materials can have a great influence. During their use, these materials are subjected to combined constraints (electric, thermal, mechanical, environmental...) that can modify their properties. Here, we have aimed to study the evolution of the electric and physicochemical properties of these materials mainly according to the temperature. The materials concerned are nanostructured microcomposite epoxy; the study will relate to samples with and without nanoclays. We will present an analysis of the physicochemical properties by dielectric scanning calorimetry "DSC" and infrared spectroscopy "FT-IR" on composite material and its components (each component will be thus analyzed separately). The electrical properties of materials with and without nanoclays will be also studied according to the temperature. We will carry out, thus, various dielectric characterizations while varying the temperature from 25degC to 150degC: conduction current, dielectric spectroscopy and space charges measurements. So far, the permittivity was found to increase at low frequency (in the range of 0,01 Hz) and higher temperature (e.g. 90degC) while, in the same conditions, the losses have a greater value for higher temperature. For the dielectric losses, its related peak at high frequencies moves forward to lower frequencies as temperature decreases. A role of the nanoclays is speculated in these observations.