Caractérisation des propriétés électriques et thermiques des composites époxy/GPOSS/noir de carbone

Abstract

Production, transport and distribution of electrical energy are fundamental to the modern society. Conductive, semi-conductive and insulating materials are used in the different applications related to electrical energy. Recently, a new class of material has emerged, nanostructured materials for electrotechnical applications. Included in these materials are dielectric materials comprising nanoparticles replacing the micro particles. These new technologies could in the future allow to enhance the electrical and thermal performances of the various materials used in high voltage applications. In this work, the studied nanocomposites are based on an epoxy resin DER 332 reinforced with nanoparticles of carbon black. For other composites, there will be an addition of a second additive: the GPOSS. The aim of the measurements done during the master degree is to characterize the electrical and thermal properties of the nanodielectric. The establishing of an appropriate fabrication procedure represents a major asset to get the expected results. Indeed, the good dispersion of the nanoparticles in the host matrix is known to affect the electrical and thermal properties. Another parameter affecting the results is the milling time which will be explained in this paper. Using dielectric spectroscopy in the frequency domain, we will be able to characterize the various electrical parameters such as the complex conductivity and the complex dielectric permittivity that are mathematically related. Also, the measurements of the dielectric breakdown strength will allow to characterize dielectric breakdown voltage of the composites as well as the sensitive various parameters such as the thickness of the samples and the measurement conditions. Scanning electron microscopy (SEM) will allow us to visualize the structure and morphology of the samples. Finally, the thermal properties will be characterized through two experiences, the direct measurement of the thermal conductivity and the differential scanning calorimetry (DSC).

Date	9 Aug 2016
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Éric David (Supervisor) & Michel F. Fréchette (Co-supervisor)