The Dielectric Response of Polar and Non-Polar Nanodielectrics

摘要: In order to understand the relationship between dielectric properties and structure of polymer nanocomposites, especially role interface on response, two polymers with different polarity were used form nanocomposites nanoalumina powder, a typical polar inorganic compound. Consequently, kinds nanodielectrics very interfaces produced. epoxy nanodielectric, broad band spectroscopic measurements show that no difference is found unfilled resin nanocomposite under dry conditions. However, their responses are when they contain about 0.4 % b.w. absorbed water, concentration occurs ambient exposure The findings suggest sites for water in those thermoset relate large interfacial internal surface these materials. this case all relaxation processes can be well described by Havriliak-Negami function, which give useful information dynamics activation energies associated processes. polyethylene incorporation produces loss peak low frequency. This moves high frequency increasing content becomes broader. presence 0.06 also shows same type unusual behavior as observed undried nanodielectrics. thought arise from interplay mobility bonding rather than host polymer.