High loading BaTiO₃ nanoparticles chemically bonded with fluorinated silicone rubber for largely enhanced dielectric properties of polymer nanocomposites

Abstract

Integrating high-loading dielectric nanoparticles into polar polymer matrices potentially can profit the intrinsic polarization of each phase and allow for greatly enhanced dielectric properties in polymer nanocomposites.

Coating Fluoropolymer on BaTiO3 Nanoparticles to Boost Permittivity and Energy Density of Polymer Nanocomposites

“…D 3 F and V 4 (mass ratio of 80:20) as the monomers, TMAH was used as the initiator to synthesize poly (methylvinylsiloxane‐methyltrifluoropropylsiloxane) (named as PF80) via anionic ring‐opening polymerization. [ 36,43 ] Step 2: Fabrication of BT@PF80 Nanoparticles. First, hydroxylated BT nanoparticles (BT‐OH) were obtained by ultrasonically treating BT nanoparticles with H 2 O 2 solution.…”

“…Afterward, the cast films were heated at 205 °C for 10 min and then quenched in ice water immediately. [ 36 ] The quenched films were dried in a vacuum at 70 °C for 12 h and peeled from the glass substrates. The average thickness of the films was about 10 μm.…”

“…However, incorporating high‐loading dielectric nanoparticles is likely to cause various defects in polymer nanocomposites, such as interface incompatibility, agglomeration, and even voids. [ 33–38 ] A mass of space charges is accumulated at incompatible interfaces or voids, leading to significant leakage currents. Furthermore, the local electric field around the nanoparticles is about several times higher than the applied electric field.…”

Preparation and characterization of CNTs/CaCu3Ti4O12/silicone rubber composites with improved dielectric and mechanical properties

“…Many studies show that adding ceramic fillers (titanium dioxide 3 and barium titanate 4,5 ), or conductive fillers (carbon nanotubes 6,7 and graphene 8,9 ) to silicone rubber can effectively improve the dielectric constant of silicone rubber. Yang et al 10 prepared barium titanate (BT)/silicone rubber dielectric composites with a dielectric constant of 3.8 when the fraction of BT was 30 wt%.…”

Multilayer Dielectric Nanocomposites with Cross-Linked Dielectric Transition Interlayers for High-Temperature Applications

“…In addition, the smaller size and the higher the aspect ratio of the nanofiller, the better is the enhancement of the dielectric properties of the nanoparticles. − Although the high content of fillers is beneficial to enhance the ε, it will make polymer films brittle and cause problems such as elevated dissipation factor and decreased E b . Although the ε of alumina itself is not high (9.3), the low doping (0.21 vol %) of Al 2 O 3 enhances the ε of the composite by weakening the restriction on the ability of dipole motion in the glassy state. − Therefore, surface modification of nanoparticles becomes an effective method to improve the dispersion of nanofillers in the matrix and improve the electrical and mechanical properties of the composites. − …”