International Journal of Materials Engineering and Technology
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Abstract: Polyvinylchloride
(PVC)/Titanium Oxidecomposites are
prepared using the casting technique. The dependence of the absorption
coefficient on photon energyis determined in the
spectral range 225-600nm at room temperature. The variation of the absorption
coefficient optical
gapdielectric constant and
loss factor with concentration and
frequency is reported. Optical energy gapis
calculated from the measured absorption spectra. Upon increasing in the content
of metal
oxide, we observe a reduction in the optical energy gap and an increase in the
absorption coefficient at UV region. The temperature dependence of the
dielectric constant and loss factor is measured for all composites at
temperature range and
at different frequency values (500Hz, 1kHz, 5kHz, 7.5kHz and 10kHz). Addition of
to
PVC host will modify the dielectric properties of PVC polymer. As the content of
increased,
we observe an increase in the dielectric constant and a reduction in the loss
factor of PVC host. A relaxation peak (a-relaxation) is observed in the loss factor curve for
both pure and composite samples. We also find that increasing of the frequency
will shift the maximum of these peaks slightly toward lower temperature values.
Composite materials such as PVC-with
high dielectric constant and low dissipation factor are very attractive
materials for many industrial applications. Correlations between morphology,
optical and dielectric results are reported.
Keywords and phrases: Polyvinylchloride, PVC, Titanium dioxide, composites, optical absorption, optical energy gap, dielectric constant, loss factor.
