Improved performances of polymer-based dielectric by using inorganic/organic core-shell nanoparticles

Abstract

BaTiO3/hyperbranched polyester/methacrylate core-shell nanoparticles were studied by varying the shell thickness and the methacrylate ratio. We demonstrated that coalescence typically observed in traditional composites employing polymer matrices is significantly reduced. By modifying the shell thickness, the equivalent filler fraction was tuned from 7 wt. % to 41 wt. %. Obtained permittivities were compared with reported models for two-phase mixtures. The nonlinear behavior of the dielectric constant as a function of the equivalent filler fraction has been fitted with the Bruggeman equation. Methacrylate groups reduce by a decade the loss factor by improving nanoparticles adhesion. The permittivity reaching 85 at 1 kHz makes core-shell nanoparticles a promising material for embedded capacitors.

Improved Dielectric Properties and Energy Storage Density of Poly(vinylidene fluoride-co-hexafluoropropylene) Nanocomposite with Hydantoin Epoxy Resin Coated BaTiO3

“…16,24,40 The temperature dependence of the dielectric constant of the samples is shown in Figure 5b. 15 The dielectric loss as a function of volume fraction of BT over the temperature range from 20 °C to 120 °C at 1 kHz and 1 MHz are shown in Figure 5c and 5d, respectively. It can be seen that the BT-10 sample has the lowest dielectric loss both at the frequency of 1 kHz and 100 kHz.…”

Highly enhanced dielectric strength and energy storage density in hydantoin@BaTiO3–P(VDF-HFP) composites with a sandwich-structure

“…Due to the difference of the dielectric properties of the polymer layer and composite layer, the interfacial polarization would take place in the polymer/ composite interface, and results the enhanced dielectric constant. 26,33 The dielectric losses of the samples as a function of frequency over the range of 1 kHz to 10 MHz are shown in Fig. 4b.…”

Engineering the nanostructure of a polymer-nanocomposite film containing Ti-based core–shell particles to enhance dielectric response

“…A subsequent development of this approach introduces an additional interface or "interphase" as a discreet third layer of material separating the nano-filler and the matrix, usually through the use of core-shell nanoparticles, which facilitate charge storing/trapping at the core/shell and shell/matrix interfaces and thereby enhance the interfacial polarisability. [18][19][20][21][22][23][24] In core-shell particulate fillers, the outer "shell" fulfils the role of the interphase and when an insulator, can also inhibit excessive current percolation effects.…”