Enhanced dielectric permittivity of fluorine polyimide matrix with embedded graphene

A polymer nanohybrid material with enhanced dielectric permittivity was prepared using the fluorine‐containing polyimide (PI) 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride/4,4′‐oxydianiline (6FDA/ODA) as matrix and graphene as conductive filler in our present work. Studies on the dielectric properties of the 6FDA/ODA–graphene nanohybrid films show that the dielectric permittivity ( ε ) can be significantly enhanced by the layer‐by‐layer structure of graphene and the presence of fluorine also has an important influence on the improvement of ε . The percolation theory and microcapacitor model are used to explain the change of dielectric properties and a percolation threshold f c = 0.0152 (2.45 wt%) was obtained by a linear‐fit calculation.(© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)