Investigation of percolation theory and permittivity model with one-dimensional fillers
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology Beijing 100029, China and Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology Changzhou 213164, Jiangsu, China
Received: 13 October 2016
Accepted: 19 January 2017
In this report, a new permittivity model based on volume weighted average and probability has been used to explain and predict the dielectric permittivity of carbon nanotubes (CNTs)/polyimide (PI) hybrid materials. The model has been verified by a composite with 8.1 vol% fillers load. The calculative data (7.97 vol%) of percolation threshold, based on the intrinsic permittivity of fillers and matrix, fitted to the reported data (8.01 vol%) in the case of 100 Hz. A potential mechanism indicated that the permittivity of the composites is influenced by localized polarization of fillers and matrix. However, geometric connection and tunneling are dispensable to plasma resonance. Additionally, a derived formula of this model expresses that extremely high permittivity of composites can be intensively influenced by the permittivity of the matrix.
PACS: 77.22.Ch – Permittivity (dielectric function)
© EPLA, 2017