▎ 摘　　要

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 (epsilon) 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 epsilon. 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. [GRAPHICS] Layer-by-layer structure of graphene (left) and the enhanced interaction between 6FDA/ODA-PI and graphene. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim