PVDF-based matrix with covalent bonded BaTiO₃ nanowires enabled ultrahigh energy density and dielectric properties

The covalent bonded cross-linked inorganic-polymer nanocomposites were designed by using high-k amine modified BaTiO₃ nanowire (NH₂-BTNW) and ferroelectric poly(vinylidene fluoride-co-hexafluoropropylene)-graft-poly(glycid methacrylate) (V-H-G). Compared with the fluoropolymer and physical mixed nanocomposite, increased dielectric constant, suppressed dielectric loss, and elevated breakdown strength were achieved for NH₂-BTNW/V-H-G due to the formation of trapping centers arising from the networks and improved dispersity of nanofiller in the matrix. The optimal sample of 15-NH₂-BTNW/V-H-G (15 wt% nanofiller loading) displayed ultrahigh energy density of 20.78 J/cm³ at the breakdown strength of 580 MV/m. This covalent bonded cross-linked inorganic-polymer nanocomposite would provide alternative strategy to design high performance dielectric materials.