Structural, Dielectric, and Magnetic Studies on Electrospun Magnesium Ferrite-Polyvinylidene Fluoride Core–Shell Composite Fibers

doi:10.1007/s40195-014-0055-1

Abstract

Abstract:

The sub-micron (of the order of 150 nm) thick core–shell composite fibers of magnesium ferrite-polyvinylidene fluoride are prepared by electrospinning. The loading of magnesium ferrite is varied from 1 to 10 wt%. The study results by X-ray diffraction, scanning electron microscope, and infra-red spectroscopy indicate the formation of core–shell structure and an enhancement in the amount of β-phase compared to α-phase in the polyvinylidene fluoride. The particle size of the magnesium ferrite in the fiber is evaluated to be 30 nm. The low frequency dielectric studies indicate that the addition of the magnesium ferrite increases the polarization resulting in the increase in the dielectric constant but decreases the dielectric loss. The magnetization measurements indicate an increased value of coercivity compared to bulk due to the nano-size of the magnesium ferrite. The microwave absorption at the ferromagnetic resonance increases with the increase in the concentration of magnesium ferrite. The resonance field is found to vary with the loading of MFO.

Key words: Electrospinning, Polymer composites, Dielectric properties, Magnetic properties, X-ray diffraction (XRD), Microwave absorption

V. Revathi, S. Dinesh Kumar, P. Chithra Lekha, V. Subramanian, T. S. Natarajan, C. Muthamizhchelvan. Structural, Dielectric, and Magnetic Studies on Electrospun Magnesium Ferrite-Polyvinylidene Fluoride Core–Shell Composite Fibers[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 557-562.

Figures/Tables 9

Fig. 1 XRD patterns of pure PVDF and MFO-PVDF with various MFO concentrations

Fig. 2 SEM images of a pure PVDF, b 3 wt% MFO-PVDF

Fig. 3 FT-IR transmittance spectra for pure PVDF and 10 wt% MFO-PVDF

Fig. 4 Variation of dielectric constant (εr/d) versus frequency (lgF) at 70 °C

Fig. 5 Variation of loss tangent with frequency at 70 °C for various loading of MFO

Fig. 6 Variation of dielectric constant (εr/d) with temperature measured at 10 kHz for various loading of MFO

Fig. 7 Variation of ac conductivity in terms of σAC/d with temperature measured at 10 kHz for various loading of MFO

Fig. 8 M-H loops of MFO-PVDF composites with various loading of MFO

Fig. 9 Variation of fraction of microwave power absorption with MFO loading

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