Flexible poly(vinylidene fluoride)-based composites with high breakdown strength and energy density induced from poly(anthraquinone sulphide)

Dielectric materials have been extensively studied over the past decades owing to their remarkable performance in modern electronic and electric systems. In this study, we put forward a new flexible dielectric composite consisting of poly(vinylidene fluoride) (PVDF) matrix and poly(anthraquinone sulphide) (PAQS) with comparable high dielectric constants and favourable compatibility. A small addition of 2 wt% PAQS into PVDF matrix can raise the breakdown strength and electric displacement up to 560 MV/m and 9.2 μC/cm2 respectively, leading to a high energy density of 18 J/cm3. Meanwhile, the excellent mechanical strength (Young’s modulus of 1 GPa) as well as toughness (breaking elongation of 205%) is also delivered by the composite. This strategy apparently promotes the development of advanced dielectric materials.