Electrical Conduction Mechanism of Carbon Black Polyethylene Composites Below the Percolation Threshold

Nakamura, Shuhei; Saito, Kazuhiko; Sawa, Goro; Kitagawa, Keiichi

doi:10.1541/ieejfms1990.118.3_280

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Resistivity of the fibers is assumed to be near to a percolation threshold at AB content 22%. Addition of a small amount of electro-conductive filler to materials in percolation threshold causes an extensive lowering in their resistivity [7,8]. In the present case, the water adsorbed is considered to play a role of an electro-conductive filler.…”

Section: Influence Of Draw Temperaturementioning

confidence: 89%

“…However, much stricter control of the electrical properties is required owing to growing demand for the picture with high resolution in electrophotography. Though some of the studies have been reported concerning the polymers filled with CB [6][7][8][9], there have been little work on the relation between variation of their average volume resistivity (AVR) depending on the surroundings where they are used and their processing conditions [10]. Under these circumstances, we have intended to develop electro-conductive fibers for a charging brush with excellent electrical properties which is applicable to color electrophotography.…”

Section: Introductionmentioning

confidence: 99%

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Dependence of Electrical Conductivities of Acetylene Black Filled Nylon-12 Fibers on Draw Spinning Conditions

Yanagizawa

Kodaira

2004

Sen-i Gakkaishi

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Draw spinning conditions for acetylene black (AB) filled nylon-12 (Ny-12) fibers were studied to get electro-conductive fibers with well-developed conduction routes of AB. A draw ratio and a draw temperature were varied to see their influence on the electro-conductivity of the fibers obtained. AB agglomerates tend to align along fiber axes with an increase of the draw ratio and conduction routes are developed to lower average volume resistivity (AVR), when the draw ratio is low. However, the conduction routes seem to be partially destroyed on a further increase of the draw ratio beyond 1.3. Variation of the scattering range of volume resistivity (VR) depending on the draw ratio is rather complicated, but its lowest value was obtained at the draw ratio of 1.3. As the draw temperature is raised, homogeneity of the conduction routes increases, since matrix polymers soften. However, fibers adhere to a draw role on drawing at a higher temperature than 80 . Thus drawing with the draw ratio of 1.3 at 80 forms fibers with the lowest AVR and the narrowest scattering range of VR. The VR of the fibers obtained under the condition remained almost unchanged regardless of the drastic change of relative humidity of the surroundings where they were placed, which indicates that they have stable electrical conductivities.

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Section: Influence Of Draw Temperaturementioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Dependence of Electrical Conductivities of Acetylene Black Filled Nylon-12 Fibers on Draw Spinning Conditions

Yanagizawa

Kodaira

2004

Sen-i Gakkaishi

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“…This suggests that actual difference in surface resistivity is only about several times. The surface resistivity was measured under DC electric field, but results by Nakamura et al 12 indicate that resistance of semi-conductive materials is affected by percolation of carbon particles, and can vary with strength and frequency of electric field. Exploration of high-frequency response in a semi-conductive sheet (frequency response of surface resistivity) is needed for a more quantitative analysis.…”

Section: Simulation Of Pd Waveforms Using Equivalent Circuit Modelmentioning

confidence: 99%

Fundamental study for assessment of surface resistivity based on waveform characteristics of partial discharge

Kawashima

Hirukawa

Yoshikawa

et al. 2023

Electrical Engineering Japan

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The partial discharge (PD) waveform reflects the evolution process of electron avalanche in the discharge space. The authors expect to estimate the condition of the discharge space based on the PD waveform characteristics. The semiconductive sheet was attached to the insulator to simulate the decrease in surface resistance due to deterioration. With the reduction of the surface resistivity, the shoulder appeared on the rising part of the PD waveform and the rise time of the PD waveform became longer. In addition, we simulated the change in the rise time using an equivalent circuit model. The displacement current was calculated from the surface potential distribution estimated by the diffusion equation, and the PD current was simulated by summing up all the current components. As a result, the shoulder was reproduced at the rising part of the PD waveform in the simulation as well. The surface resistance was estimated from the PD waveform by fitting with the experimental results.

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Development of Low Loss Magnetodielectric Nanocomposites of Epoxy Resin and Iron Nanoparticles

Hirose

Hasegawa

Ohki

2014

Electrical Engineering Japan

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To achieve the aim of developing a new insulating substrate that can exhibit both high permittivity and high permeability, ferromagnetic iron nanoparticles were dispersed uniformly in epoxy resin. Measurements of the electrical conductivity, permittivity, and permeability indicate that the composite can be a good candidate for an insulating substrate with negligibly small eddy-current loss and sufficiently high permittivity. C⃝ 2014 Wiley Periodicals, Inc. Electr Eng Jpn, 190(2): 17-23, 2015; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Electrical Conduction Mechanism of Carbon Black Polyethylene Composites Below the Percolation Threshold

Cited by 6 publications

References 3 publications

Dependence of Electrical Conductivities of Acetylene Black Filled Nylon-12 Fibers on Draw Spinning Conditions

Dependence of Electrical Conductivities of Acetylene Black Filled Nylon-12 Fibers on Draw Spinning Conditions

Fundamental study for assessment of surface resistivity based on waveform characteristics of partial discharge

Development of Low Loss Magnetodielectric Nanocomposites of Epoxy Resin and Iron Nanoparticles

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