Significantly enhanced permittivity and suppressed loss of P(VDF-HFP)-based composites by introducing PPy@BT-OH fillers

Abstract

Polymer-based composites with high dielectric permittivity (high-k) are extensively utilized in embedded capacitors, pulse power supplies and radio frequency filter, etc. However, the enhancement of permittivity often comes at the price of elevated loss, which greatly diminishes the energy conversion efficiency and stability of the device. Herein, we loaded hydroxylated barium titanate (BT-OH) onto polypyrrole nanowire (PPy) to prepare a kind of PPy@BT-OH fillers and further incorporated them into Poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) polymer. Gaining from the stronger interfacial polarization effect and the hindrance to the development of conductive network triggered by PPy@BT-OH fillers, a significantly enhanced permittivity of ∼ 209.2 @ 10 kHz accompanied by a relatively low loss (tan δ ∼ 0.14 @ 10 kHz) was simultaneously realized in PPy@BT-OH/P(VDF-HFP) composite with 8 wt% filler contents.