Abstract
In this work, ten carbon black (CB)
loaded elastic acrylonitrile butadiene rubber
(NBR) nano-composites have been prepared to be
used in microwave shielding applications. The DC
electric properties of these CB loaded NBR
composites have been studied. The evolution of
DC conductivity of CB loaded NBR composites
with loading level revealed S-shapes curve in
accordance with the percolation theory. The
current (I)-voltage (V) relations have been studied
for these samples at room temperature. All CB
loaded NBR composite samples showed Ohmic
behavior with the exception of two samples
namely CB30 and CB40 in which space charge
limited conduction is obvious. Microwave
shielding has been calculated from the
transmittance data measured using terahertz time
domain spectroscopy (THz-TDS) technique. The
analysis of microwave shielding data revealed that
the sample CB70 has the highest shielding
effectiveness. The results of the microwave
shielding effectiveness of CB loaded NBR
composites were correlated to their DC electric
conductivities. Results showed that there is a
strong relationship between the DC electric
conductivity of the samples and their activity
regarding microwave shielding effectiveness. The
current investigation of microwave shielding
properties of CB loaded NBR composites
magnifies the importance of DC electric
conduction losses as a major mechanism for
microwave shielding.
http://www.jmest.org/wp-content/uploads/JMESTN42350842.pdf
TPS Spectra 3000, (TeraView, UK) was used
for measuring transmittance of the samples in the frequency range 10-1000 GHz
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