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Electrical properties of polycarbonate/expanded graphite nanocomposites
Author(s) -
Gupta A.,
Goyal R. K.
Publication year - 2019
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.47274
Subject(s) - materials science , nanocomposite , polycarbonate , percolation threshold , dielectric , antistatic agent , composite material , percolation (cognitive psychology) , electrical resistivity and conductivity , graphite , dispersion (optics) , dissipation factor , scanning electron microscope , electrical engineering , physics , optoelectronics , engineering , optics , layer (electronics) , neuroscience , biology
In present study, polymer matrix nanocomposites based on polycarbonate as matrix and expanded graphite (EG) as reinforcement were fabricated using a simple solution method followed by hot pressing. Scanning electron microscopy revealed almost uniform dispersion and three dimensional networks of EG particles in the matrix. The dc and ac electrical conductivities of the nanocomposites increased with increasing EG content in the matrix. The electrical percolation threshold was observed between 1 and 2 wt % EG. The improvement in the conductivity of 10 wt % nanocomposite was found more than 13 orders of magnitude higher than that of pure matrix. The dielectric constant (at 1 MHz) of the nanocomposite containing 10 wt % EG was increased to about 137. The significant increase in electrical conductivity, dielectric constant, and dissipation factor for the nanocomposites might be good for the applications in antistatic/electromagnetic interference shielding applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47274.