Electrical properties of polyurethane graphite composites

Publication Issue: 
Volume 29, Number 1&2, 2008
Page No: 
Date Received: 
Wednesday, December 6, 2006
Authors' Name: 
T. S. Velayuthama
A. B. Ahmada
W. H. Abd Majida
Gan Seng Neonb
Authors' Affiliation and Address: 
aMaterial Science Laboratory, Physics Department, University of Malaya, 50603 Kuala Lumpur, Malaysia
bChemistry Department, University of Malaya, 50603 Kuala Lumpur, Malaysia

The introduction of electrically conducting particles
into a polymeric material have been the subject of
numerous work and gives very interesting and useful
properties to the filled composites. In general, low
content of filler in composite are still an insulator
because the conducting particles are well separated. As
the percentage of the filler is increased the conductivity
increases [1].
Graphite is used as electroconductive filler due to its
good conductivity and moderate cost. It is also reported
that graphite increases the mechanical and thermal
properties as well as the dimensional stability of the
polymeric material [2].
The properties of polymers depend upon several
factors like molecular weight, chemical nature of the
units composing the polymer and the morphology in
solid state [3]. Polyurethanes are used as potting
compounds and as cable insulation, therefore, the
frequency dependence of the dielectric properties is
important in practical and theoretical evaluations [4].

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