In order to raise the dielectric constant of polymer based dielectrics, composite approaches, in which inorganic fillers with much higher dielectric constant are added to the polymer matrix, have been investigated. However, the high dielectric constant fillers at high volume loading cause high local electric fields in the polymer, resulting in a large reduction of the electric breakdown strength as well as large changes in mechanical properties. Here, we present a new class of polymer nanocomposites -- dilute nanocomposites, in which very low volume loading of nanofillers (&lt; 1 vol%) with dielectric constant similar to the polymers generate marked enhancement in the dielectric performance such as dielectric constant and dielectric strength in several high temperature dielectric polymers. Through nanointerface effects, the presence of nanofillers at ultralow volume loading reduces the constraints for the dipole response following applied electric field, thus enhancing the dielectric constant. We present dielectric studies over a broad frequency and temperature of these dilute nanocomposites, which show no changes assciated with the relaxoation of glass transition of the polymer matrix

Dilute nanocomposites -- Achieving high dielectric performance by exploiting nanointerface effects in dielectric polymers

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