An additional polarization contribution from the interfaces was proposed in these multicomponent systems even though the origin of the interfacial polarization
is still unclear (probably due to the different conductivity between two components and the resulting charge accumulation at interface) [35, 37], The results demonstrate the promise of blend approaches for tailoring and enhancing the dielectric properties of ferroelectric polymers.
Moreover, the contribution of Maxwell-Wagner interfacial polarization
due to heterogerfiety present in the system progressively increases as the measurement frequency is decreased (ref.
As interfacial polarization
takes place at large scale (mesoscopic scale), it has usually been observed at low frequencies, due to its large relaxation time with respect to electric field frequency at high frequencies.
Higher permittivity values at low frequency can be explained by invoking interfacial polarization
mechanism, akin to that reported for the other composite system in the literature (14-18).
Moreover, the smaller size Al particles/LLDPE composite shows a stronger interfacial polarization
effect, compared to the larger size particles filled one.
The Maxwell-Wagner-Sillars (MWS) interfacial polarization
effect was seen in the dielectric permittivity curve for the two-phase semicrystalline polymer, which was absent for its amorphous counterpart (7).
The composites show a high dielectric constant upon the addition of graphite nanosheet fillers, as a result of interfacial polarization
, as illustrated in Fig.
However, silica can increase the interfacial polarization
due to the Maxwell-Wagner effect (24), (25).
In addition, the increase in the volume fraction of CLNT ceramic increases the interface between CLNT and polymer and hence the influence of interfacial polarization
on the relative permittivity and dielectric loss tangent is significant.
As the longer range movement of charge carriers requires more time for polarization and hence interfacial polarization
is active only in the lower frequencies.
This phenomenon is known as Maxwell-Wagner-Sillers (MWS) interfacial polarization
The microwave absorption in the system of the conductive material mixed with the non-conductive material is related to the interfacial polarization