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In this work, the Fe 3 O 4 -carbon black filler was obtained from an in-situ coprecipitation method followed by the modification of the heptadecafluorodecyltrimethoxysilane and the Fe 3 O 4 -carbon black/poly(vinylidene fluoride) (PVDF) composites with enhanced properties were prepared by a simple solution blending-water precipitating method. The Fe 3 O 4 -carbon black distributed well in the PVDF matrix, which was confirmed by the SEM. According to the results of FTIR and WAXD, a lot of useful polar crystalline phases of PVDF formed in the Fe 3 O 4 -carbon black/PVDF composites. The electrically conductive ability, the dielectric permittivity, the dielectric loss factor, and the magnetic saturation value of the Fe 3 O 4 -carbon black/PVDF composite increased with the increasing loading amount of Fe 3 O 4 -carbon black filler. Especially, when the Fe 3 O 4 -carbon black was 5 wt.%, the dielectric permittivity of Fe 3 O 4 -carbon black/PVDF composite reached as high as 23.5 at 1000 Hz with a relatively low dielectric loss factor value of 0.38 and a magnetic saturation value of 0.64 emu/g.

Preparation of Fe 3 O 4 -carbon black/poly(vinylidene fluoride) composites with enhanced properties