)*( To whom correspondence should be addressed. E-mail: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Abstract Key Words polarization, dielectric constant, dissipation factor, dielectric nanocomposite, nanoparticles Polymerization Quarterly, 2013 Volume 3, Number 3 Pages 25-34 ISSN: 2252-0449 Dielectric Polymer Composites: An Introduction and Teir Applications Mohsen Sadroddini, Mehdi Razzaghi Kashani * Department of Polymer Engineering, Faculty of Chemical Engineering, Tarbiat Modaress University, P.O. Box: 14115-114, Tehran, Iran Received: 20 July 2013, Accepted: 28 September 2013 I n recent years there has been an increasing need in obtaining high-permittivity (high-k) materials due to rapid development of electrical/electronic industry. In practice, these materials are mainly designed and employed as polymeric composites containing different ceramics, conductive metallic and non-metallic fllers. Each kind of these fllers may improve the dielectric properties of the fnal composite by a specifc mechanism. Use of ceramics is a more common approach and those of conducting fllers and a combination of ceramics and conducting particles are of later methods. This is a brief report on basic defnitions, methods of increasing the dielectric constant, recent advances and research efforts toward achieving high dielectric properties, including high-k and low dielectric loss tangent for polymer composite. mehdi.razzaghi@modares.ac.ir