High dielectric constant and low loss in poly(fluorovinylidene-co-hexafluoropropylene) nanocomposite incorporated with liquid-exfoliated oriented graphene with assistance of hyperbranched polyethylene

The fabrication of polymer dielectrics combining large dielectric constant and low loss is still challenge for now. Here we demonstrate that the significantly enhanced dielectric property is achieved in P(VDF-HFP) nanocomposite incorporated with few-layer graphene, which is liquid exfoliated with assistance of HBPE based on CH-π stacking. The arrayed nanosheets in nanocomposite is accomplished via uniaxial stretching and is modeled based on Jeffery equation. High dielectric performance is obtained in stretched nanocomposite due to formation of micro-capacitor and large content of electroactive phase, which is attributed to macromolecular crystallization and electrostatic force between matrix and modifier of graphene.239