Preparation of Fe3O4-carbon black/poly(vinylidene fluoride) composites with enhanced properties

In this work, the Fe3O4-carbon black filler was obtained from an in-situ coprecipitation method followed by the modification of the heptadecafluorodecyltrimethoxysilane and the Fe3O4-carbon black/poly(vinylidene fluoride) (PVDF) composites with enhanced properties were prepared by a simple solution blending-water precipitating method. The Fe3O4-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 Fe3O4-carbon black/PVDF composites. The electrically conductive ability, the dielectric permittivity, the dielectric loss factor, and the magnetic saturation value of the Fe3O4-carbon black/PVDF composite increased with the increasing loading amount of Fe3O4-carbon black filler. Especially, when the Fe3O4-carbon black was 5 wt.%, the dielectric permittivity of Fe3O4-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.

Automated summary

In this study, Fe3O4-carbon black filler was prepared using an in-situ coprecipitation method, and Fe3O4-carbon black/poly(vinylidene fluoride) (PVDF) composites with enhanced properties were prepared via a simple solution blending-water precipitating method. The SEM analysis confirmed the good dispersion of Fe3O4-carbon black in the PVDF matrix. FTIR and WAXD results revealed the formation of useful polar crystalline phases in the Fe3O4-carbon black/PVDF composites. The electrically conductive ability, dielectric permittivity, dielectric loss factor, and magnetic saturation value of the composites increased with increasing loading amount of Fe3O4-carbon black filler. Particularly, at a loading amount of 5 wt.%, the Fe3O4-carbon black/PVDF composite exhibited a high dielectric permittivity of 23.5 at 1000 Hz, a relatively low dielectric loss factor value of 0.38, and a magnetic saturation value of 0.64 emu/g.