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References in periodicals archive ?
This dramatic increase in [epsilon]" seen at low-frequency region and 200[degrees]C for both pure PCN and blend films can be attributed to the presence of Maxwell-Wagner-Sillars polarization.
Beyond this percentage of epoxy resin, dielectric constants of PCN/epoxy blends greatly increase at low-frequency region (0.1 Hz-[10.sup.3] Hz) due to the interfacial polarization governed by Maxwell-Wagner-Sillars effect.
Second, differences in the dielectric constant and conductivity of PANI and the surrounding epoxy matrix may lead to the Maxwell-Wagner-Sillars (MWS) interfacial polarization effect because of the accumulation of mobile charges at the interfaces between the two matrices [34, 35].
Samples containing only pure PANI or a small concentration of CSA showed very high values for dielectric loss ([epsilon]") and storage ([epsilon]'), which suggested the existence of electrode polarization and Maxwell-Wagner-Sillars interfacial polarization effects, especially at low frequencies and higher temperatures.
The first relaxation was detected at low frequency, and it is attributable to a Maxwell-Wagner-Sillars polarization associated with the blocking of charges at the interfaces between two inhomogeneous phases with different conductivity, such as the polymer matrix and the silicates filler [29-31].
In order to study the temperature dependence of both relaxation processes for the PE/O-MMT nanocomposites, the relaxation rate [f.sub.max] of the Maxwell-Wagner-Sillars and dipolar polarization processes were plotted versus inverse temperatures, as shown in Figure 10.
It can be seen that both processes follow Arrhenius' law, with activation energies of 1.2 eV and 1.6 eV for the Maxwell-Wagner-Sillars and dipolar relaxation, respectively.
It is evident from Figure 11 that the values of the relaxation rate [f.sub.max] of Maxwell-Wagner-Sillars are significantly influenced by the structure of the nanocomposites, with the values of [f.sub.max] being higher in the well-dispersed PE/O-MMT/PE-MA nanocomposites than in the PE/O-MMT nanocomposites.
Accordingly, the improvement in the degree of dispersion in PE/O-MMT/PE-MA nanocomposites obtained with the addition of the compatibilizer leads to a decrease in the mean distance between the clay layers and consequently an increase in the relaxation rate [f.sub.max] for the Maxwell-Wagner-Sillars process.