Dielectric behavior of carbon black filled polymer composites

Abstract

This paper reports results on the dielectric properties of carbon black filled crosslinked polyethylene composites. These systems are shown to follow percolative type models. The dielectric constant increases slowly, with carbon black concentration, up to roughly the percolation concentration and then increases rapidly over the whole concentration ranges studied. The dissipation factor‐concentration curves are bell‐shaped with maximum values at approximately the percolation concentration. The dielectric properties of these systems are discussed in terms of interfacial Maxwell‐Wagner polarization effects.

Electrical and dielectric properties of segregated carbon black–polyethylene systems

“…When conductive carbon black is used as a conductive filler, the above indicated threshold values drop drastically. For a random distribution the insulator-conductor transition is attained by adding 2.5-10% (v/v) conductive carbon black (19). With a segregated distribution, the present work shows that the critical concentration can be further lowered to about 0.4% (v/v) filler with good conductivity values.…”

Devulcanization of ground tire rubber: Physical and chemical changes after different microwave exposure times

“…However, nonpolar elastomers, such as tire rubber, are unable to absorb the microwave energy due to their low absorption and scattering, which requires adding some particles to absorb the energy, such as carbon black [13]. This filler is known to absorb electromagnetic radiation through a phenomenon known as MaxwellWagner polarization, and the devulcanization process can only be achieved through it [20][21][22]. According to Pistor et al [23] the greater the presence of carbon black in the rubber, the more uniform and selective will be the devulcanization process.…”

Studies on Physicomechanical and Electrical Properties of SBR - Carbon Black Composites

“…Figure 1(a) also shows the influence of frequencies on the dielectric constant of the composites. This means that at lower frequencies of from 1 to 500 kHz, a steep increase in dielectric properties can be noticed compared to higher frequency ranges (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13). The increase in dielectric behavior at a higher dosage of carbon black loading is due to an increase in filler-filler interaction.…”

“…Electrical and electromechanical measurements for rubber filled with carbon black in the 0-70 phr range were reported by Burton et al [10]. Yacubowicz and Narkis [11] reported the dielectric behavior of carbon black-filled polymer composites. Garcia and Bahder [12] measured the specific capacitance of polyethylene loaded with carbon black.…”