Premium
Dielectric behavior of three phase polyimide percolative nanocomposites
Author(s) -
Devaraju Naga Gopi,
Lee Burtrand I.
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22856
Subject(s) - materials science , nanocomposite , percolation threshold , dielectric , polyimide , composite material , barium titanate , percolation (cognitive psychology) , percolation theory , dissipation factor , phase (matter) , composite number , permittivity , ceramic , nanoparticle , conductivity , electrical resistivity and conductivity , nanotechnology , layer (electronics) , chemistry , optoelectronics , engineering , organic chemistry , neuroscience , electrical engineering , biology
Three phase ceramic–metal–plastic (cermetplas) percolative nanocomposite films were prepared using polyimide, as the matrix to prepare the composite films. Silver nanoparticles with a mean particle size of about 41 nm were prepared and used as the metal phase. Nanocomposites of barium titanate (BaTiO 3 ) particles in polyimide matrix, with silver as metallic inclusion, were formulated using effective medium theory and percolation theory. The concentration and frequency dependence of dielectric permittivity (ε) and loss tangent (tan δ) measurements were reported and discussed for cermetplas below the percolation threshold. Experimental results for cermetplas show that a ε of above 500 can be achieved below the percolation. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci, 2006