Enhanced dielectric properties due to space charge-induced interfacial polarization in multilayer polymer films

Abstract

Interfacial polarization due to space charges enhances electrical insulation and thus breakdown strength for multilayer polymer films.

Sn‐Polyester/Polyimide Hybrid Flexible Free‐Standing Film as a Tunable Dielectric Material

“…At lower frequencies (i.e., <10 kHz), an upturn in tan δ was observed. Upon increasing the temperature, these peaks shifted to higher frequencies, which can be an indication of interfacial polarization, a typical characteristic of hybrids . Studies show that interfacial polarization can contribute to the loss peak, especially at low frequency regions where temperature is a controlling factor .…”

“…Upon increasing the temperature, these peaks shifted to higher frequencies, which can be an indication of interfacial polarization, a typical characteristic of hybrids . Studies show that interfacial polarization can contribute to the loss peak, especially at low frequency regions where temperature is a controlling factor . Generally, with an increase in temperature, loss factor also increases due to the increased bulk conduction loss .…”

“…The branched methyl groups hinder the chain packing and create more room to relax the chain. In contrast to that for hybrid system, interfaces also play a role in controlling the conduction loss via the trap formation for reduced electronic conductivity …”

Interface design for high energy density polymer nanocomposites

“…Importantly, in addition to the polarization from the PVDF ferroelectric layer, interfacial polarization can also build up at the interface of multi-layer structured composites in response to the application of an electric field and plays an important role in the electric and dielectric properties of composites. Chen et al 246 developed a multi-layer film comprised of PVDF and polycarbonate (PC) with either 32 layers or 256 layers, but maintained the same total polymer thickness by reducing the thickness of the individual polymer layers; a schematic is shown in Fig. 25.…”

Improved dielectric constant and energy density of P(VDF-HFP) composites using NBT-xST (x=0, 0.10, 0.26) whiskers

“…[1][2][3] Among these technologies, dielectric capacitors own the advantages of high power density, fast charge/discharge speed, environmental friendliness and almost unlimited cycle life. 4,5 With the increasing demand for high power capacitors used in portable electronic devices, stationary power systems and high power microwaves, it is crucial to improve the energy density of dielectric capacitors. [6][7][8] In general, the energy density of dielectric materials is defined as the integral U e ¼ R EdD, where E is the electric field and D is the electric displacement.…”