Dielectric properties of multiwall carbon nanotube-epoxy composites

Resin and functionalized multiwall carbon nanotubes (fMWCNT) were used to obtain composites, cured at room temperature (RT). Dielectric measurements show changes of permittivity and losses in cooling-heating cycle with nonreproducible values above 50 oC. Interplay of segments with increased mobility due to increasing resin temperature, the differences between thermal expansion coefficients between resin and fMWCNT, spatial rearrangements in samples and post curing effects could explain the evolution of dielectric parameters versus temperature. Permittivity and losses show strong frequency dependence associated with reducing contributions of different polarization mechanisms at increasi…