Abstract
PVC-LiF composites films with different lithium fluoride (LiF) concentrations (0, 30, 50, and 70 weight %) were prepared by using the casting method. This research deals with the investigation of dielectric properties for PVC-LiF composite films as a function of frequency and temperature in the ranges of 100 to 107 Hz and 293 - 370 K, respectively. The A.C activation energy values estimated from Arrhenius equation were 0.03820, 0.3174, 0.2009, and 0.1845 eV for the different PVC-LiF films with different LiF concentrations, respectively. It was found that the activation energy decreases by increasing LiF concentration and frequency. The exponent (s) showed a progressive increase with LiF for PVC-LiF films, while it showed a non-systematic sequence with the increase of temperature. The dependence of the dielectric constant (εr) and dielectric loss (εi) on temperature and frequency was investigated for PVC-LiF films with the different LiF concentrations. The dielectric spectrum showed a strong dispersion when LiF was added to the polymer matrix (PVC) in the whole range of frequency and temperature. The results were interpreted in terms of structural differences caused by the effect of thermal treatment.
Highlights
Polyvinyl chloride (PVC) is the most common polymer with multiple uses which occupies the second place among manufacturing polymers in the world [1]
Figure-2 shows the relation between ζ t(ω) and frequency of PVC-lithium fluoride (LiF) composite films with different LiF concentrations (0,30,50, and 70 % wt)
The results indicated that these peaks are slightly pronounced in the spectrum of the net PVC, but becomes more pronounced by the addition of LiF
Summary
Polyvinyl chloride (PVC) is the most common polymer with multiple uses which occupies the second place among manufacturing polymers in the world [1]. The parallel capacitance and conductance were measured simultaneously by a programmable LCR meter (HP-4274A and HP-4275A models) with an operating frequency that ranges 100 - 107Hz, a temperature range of 298- 473K, and a constant voltage of 0.08V. In this part of the study we present and discuss the results of A.C conductivity ζac ( ), the dielectric constants εr, and εi of PVC/LiF composites with different LIF ratios (0,30,50, and 70%). Figure-2 shows the relation between ζ t(ω) and frequency of PVC-LiF composite films with different LiF concentrations (0,30,50, and 70 % wt).
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