Simultaneously improved dielectric property and thermal conductivity of PVDF-based composites by BNNS loaded with BT@PANI core-shell particles
Barium titanate@polyaniline(BT@PANI)core-shell particles were deposited on the boron nitride nanosheets(BNNS)surface to prepare a novel composite filler utilizing the adhesion of polydopamine(PDA)which had been synthesized as the surface modification of the boron nitride nanosheets(BNNS)by in-situ poly-merization.The results showed that the BT@PANI load content of the single BNNS sheet had a significant effect on the dielectric property and thermal conductivity of the poly(vinylidene fluoride)-based(PVDF-based)composite materials.Moreover,compared with the BT@PANI/PVDF composite,the dielectric properties of the composites are significantly improved with frequency variation.When the BT@PANI load content on single BNNS is maximum,compared with the BT@PANI/PVDF composites with the same filling amount,the inter-face polarization of the composites is the weakest,and the dielectric properties show better frequency stability.Their values of the composite at 20wt％filler loading are 14.8 and 0.082(105 Hz),respectively.The thermal conductivity of the composite also declined to a minimum of 0.64 W/(m·K).At frequencies higher than 103 Hz,the dielectric loss of the composites decreases by more than twice the dielectric constant.This work have realized synchronously to enhance the dielectric constant,suppress dielectric loss and endow high thermal conductivity,which provides an innovative idea for the development of energy storage polymer-based composite dielectric.
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维普
