Temperature dependence of electric and dielectric behaviors of Ni/polyvinylidene fluoride composites

Xu, Haiping; Dang, Zhi‐Min; Bing, Naici; Wu, Yihua; Yang, Danni

doi:10.1063/1.3289731

Cited by 84 publications

(44 citation statements)

References 32 publications

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“…The sharp drop of dielectric constant of binary composite film is found in the temperature ranges from 250 to 300 K; the cups-like peak of loss is also found. It can be describes by the motions of side group or end group, or main chain that are typical for PVDF, which have been reported in many researches [24,28]. Another possible reason is the excitation of charge carriers which are already trapped inside the Ba-PCH [27].…”

Section: Temperature Dependence Of Dielectric Constantmentioning

confidence: 97%

Increment of dielectric constant in binary composite based on PVDF/clay system

Bunnak

Laoratanakul

Bhalla

et al. 2015

J Mater Sci: Mater Electron

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Binary composite films, with 10 wt% of barium doped porous clay heterostructure (Ba-PCH) in polyvinylidene difluoride, were fabricated by using mechanical mixing (Brabender) and hot pressing methods. The grain morphology of the composite films, as investigated by using the field emission scanning electron microscope, exhibits some agglomeration of Ba-PCH particles. The dielectric properties, as functions of frequency and temperature, were measured using a network analyzer. The dielectric constant of the composite film exhibits strong frequency and temperature dependence. The sharp drop of the dielectric constant is resulted, when temperature is decreased below the glass transition temperature of the polyvinylidene difluoride. The relaxation behaviors are analyzed carefully using the Arrhenius law and the other possible mechanisms and the study indicated that the dielectric behavior in these composite films is highly dominated by the electronic polarizability contributions.

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Section: Temperature Dependence Of Dielectric Constantmentioning

confidence: 97%

Increment of dielectric constant in binary composite based on PVDF/clay system

Bunnak

Laoratanakul

Bhalla

et al. 2015

J Mater Sci: Mater Electron

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“…The percolation threshold is normally used in defi ning the regions where the material properties are considerably different. For electrical percolation around 16 vol % Ni in PVDF, electrical resistivity is substantially reduced [12] . Moreover, dielectric constant is enhanced near the threshold [5,12] .…”

Section: Introductionmentioning

confidence: 99%

“…Xu et al compared the effect of Ni, zinc, tungsten and carbon black fi llers in PVDF and found that Ni gave rise to the highest dielectric constant [5] . To tailor PVDF/Ni composites for applications, infl uences of temperature [6,12] and Ni loading around the percolation threshold [5, 10 -12] on their properties have been investigated. The percolation threshold is normally used in defi ning the regions where the material properties are considerably different.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and magnetic properties of polyvinylidene fluoride polymer composites highly loaded with nickel

Sirisathitkul

Jantaratana

Muensit³

2012

Science and Engineering of Composite Materials

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In this work, electroactive polyvinylidene fl uoride (PVDF) was a matrix for dispersing 10 wt % ferromagnetic nickel (Ni) particles. The composites were formed into its shape by using a spin coater with varying spinning speeds from 750 to 3750 rpm to obtain the thicknesses between 68 μ m and 40 μ m on printed circuit board substrates. Magnetic hysteresis loops of the composites were dependent on the spinning speed because the spin regulated the dispersion and size distribution of Ni particles in the PVDF matrix. Owing to the Ni agglomeration, the composites prepared by 750, 1500 and 2250 rpm spinning clearly displayed soft ferromagnetic properties but the capacitance was decreased with the decrease in spinning speed. In every sample, the capacitance was reduced with the increase in frequency from 1 kHz to 100 kHz and remained minimal up to 1 MHz. These changes in capacitance can be explained by the polarization of surface charges of Ni clusters of varying sizes from different spinning speeds. The dissipation factor was, by contrast, sensitive to the frequency and the dispersion of Ni only at frequencies higher than 60 kHz.

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“…Conductive polymer composite (CPC), composed of an insulated polymer filled with an electrically conductive filler, has attracted enormous attention in recent years for industrial applications in the fields of antistatic materials, self-regulating heaters, over-current, over-temperature protection devices, electromagnetic interference shielding and thermoelectric materials [1][2][3][4][5][6][7][8] . When the concentration of the conductive grains reaches a critical value, a conductive network in the polymer matrix starts to construct, resulting in composite to transition from insulator to conductor.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Compaction Temperature on the Electrical and Mechanical Properties of the Segregated Conductive Ultrahigh Molecular Weight Polyethylene/Carbon Nanotube Composite

Pang

Chen

et al. 2012

Polymer-Plastics Technology and Engineering

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The effect of the compaction temperature on the electrical and mechanical properties of the segregated conductive polymer (CPC)/ carbon nanotube (CNT) composites was investigated. The conductive fillers were not uniformly dispersed in the composites but were dominantly localized on the granule boundaries, very efficiently forming conductive networks. The ultrahigh-molecular-weight polyethylene (UHMWPE) segregated CPCs were synthesized with two compaction temperature, one just above the melting temperature (145 C) and another higher than the melting temperature (200 C). UHMWPE/CNT exhibited the better electrical conductivity by comparing to high-density polyethylene (HDPE)/UHMWPE/ CNT, while the HDPE/UHMWPE/CNT segregate CPCs displayed the higher values of the tensile mechanical properties than those of UHMWPE/CNT at the two compaction temperatures. The higher compaction temperature was in favor of the improvement on mechanical properties and degraded the electrical performance of UHMWPE/CNT. For HDPE/UHMWPE/CNT, the electrical and mechanical properties both reduced with decreasing the compaction temperature. These results can further determine the optimal preparation conditions of the segregated composites.

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Temperature dependence of electric and dielectric behaviors of Ni/polyvinylidene fluoride composites

Cited by 84 publications

References 32 publications

Increment of dielectric constant in binary composite based on PVDF/clay system

Increment of dielectric constant in binary composite based on PVDF/clay system

Dielectric and magnetic properties of polyvinylidene fluoride polymer composites highly loaded with nickel

Influence of the Compaction Temperature on the Electrical and Mechanical Properties of the Segregated Conductive Ultrahigh Molecular Weight Polyethylene/Carbon Nanotube Composite

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