Preparation and Dielectric Properties of Epoxy/Silica Nanocomposites

In this paper, epoxy resin based composites filled with nano-silica were fabricated. The relationships between the dielectric properties as well as glass transition temperature (T-g) and nano-filler content were investigated. The results showed that, relative permittivity (epsilon(r)) and dielectric loss tangent (tan delta) decreased when filler content was no more than 0.3wt.%, and reached minimum value at 0.3wt.%, but above this filler loading, epsilon(r) and tan delta started to increase with increasing filler content. The DC volume resistivity decreased with the introduction of nano-silica, and the value of T-g did not appear to change significantly with filler content.