Enhanced high permittivity and lowed dielectric loss in cellulose–fiber framework polymer microcomposites

Poly(vinylidene fluoride) and poly(bisphenol A carbonate), are developed to fabricate advanced dielectric polymer microcomposites. After the cellulose–fiber frameworks are incorporated into the matrix, the room temperature permittivity at 1 kHz is increased as large as by almost 109% to reach ∼81, while the dielectric loss at 1 kHz is decreased by 31% at the magnitude of 10⁻². The dielectric mechanism is discussed based on a combination mechanism of dipole polarization, interfacial polarization and surface effect. This study demonstrates the beneficial effect of the cellulose–fiber framework on dielectric properties, providing a promising route to achieve high-performance dielectric materials. POLYM. COMPOS., 40:1526–1535, 2019.