A direct proof for Maxwell–Wagner effect of heterogeneous interface

Abstract

In this paper, the Maxwell–Wagner effect and the charge characteristics of the heterogeneous interface at the action of higher electric field and elevated temperature are investigated by means of electret technology. A composite membrane with a double-layer structure of a polypropylene (PP) film and a fluorinated ethylene propylene copolymer (FEP) film was made. After being polarized under electric field and elevated temperature, the component PP and FEP films of the composite membranes were separated. The charge density of the PP and FEP films was measured to analyze the characteristics of interfacial charge in the composite membrane. Experimental results directly prove that the charge characteristics at the interface of the composite membranes are consistent with the result calculated by the Maxwell–Wagner effect. The polarity of the interfacial charge can be switched by changing the polarity of the polarizing voltage. The characteristics of the accumulated interfacial charge are strongly dependent on the conductivity, which is affected by the temperature and the polarizing electric field. A new phenomenon, that is, the measured charge density is much higher than that calculated by the Maxwell–Wagner effect, is found. The reason is ascribed to the electret effect from the FEP and PP films. This research provides a new insight into the charge characteristics at the heterogeneous interface.

Smart polydimethylsiloxane sponges with high piezoelectric responses

“…The great improvement for the value can be attributed to the PDMS–PTFE interface which may itself be an ideal trap for charge retention due to the Maxwell–Wagner phenomenon. [ 49,58–61 ] Thus, the existence of PTFE particles dramatically improves the capability of charge retention. In addition, the process of directly mixing PDMS with PTFE particles is more convenient than the traditional PTFE film coating method.…”

“…The great improvement for the d eff 33 value can be attributed to the PDMS-PTFE interface which may itself be an ideal trap for charge retention due to the Maxwell-Wagner phenomenon. [49,[58][59][60][61] Thus, the existence of PTFE particles dramatically improves the capability of charge retention.…”

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

“…The MWS polarization model is useful for studying space charge behavior at the interface in heterogeneous materials. [16,40,41,124] The advantage of this model is to use macroscopic parameters (such as the dielectric constant and conductivity of the material) to discuss the interface charge, without using assumed values of trap depth and activation energy related to carrier injection and transport processes. [32,41,125,126] However, it should be noted that the MWS polarization model suggests that there should be no charge at the interface between the same materials, which contradicts experimental results.…”

Studying Dielectric Losses of Serially Combined Silicone Rubber and Epoxy Resin

“…The arrangement of Figure 1 shows an electric field applied to an insulating material (polymers for this study) which exhibits one relaxation time shown in Figure 3, a Maxwell-Wagner polarization (Kumara et al, 2020;Li, Chen, et al, 2021;Xu et al, 2017). The shown parallel capacitance 0 t C  is the high-frequency polarization capacitance, which is strange, independent of the frequency bands.…”