Space charge distributions in glass fibre/epoxy resin composites under dc 10 kV mm<sup>−1</sup>electric field

Tanaka, Hidesato; Ohki, Yoshimichi; Fukunaga, Kaori; Maeno, Takashi; Okamoto, Kenji

doi:10.1088/0022-3727/40/5/027

Cited by 25 publications

(5 citation statements)

References 10 publications

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“…Simultaneously, there is a positive charge density peak (with a maximum density of 9.5 C/m 3 ) at a distance of 600 μm away from the cathode, demonstrating that there exists a place where the trap energy is so high that the space charges cannot go through. 35 Considering the equal distance between the cathode and anode as well as the structure of the [g-MWCNT0.5/CE] 2 material, the place is believed to be the interface between the two composites. As the conductor fault appears in the interface, where positive and negative charges aggregate, leading to a significantly improved dielectric constant.…”

Section: Resultsmentioning

confidence: 99%

High-k Materials with Low Dielectric Loss Based on Two Superposed Gradient Carbon Nanotube/Cyanate Ester Composites

et al. 2013

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Higher dielectric constant, lower dielectric loss, and good processing characteristics have been the goal for developing high-k materials in actual cutting-edge applications. The distribution, motion, and the rearrangement of space charges are the key factors in determining the dielectric properties of a material; however, few reports focus on this subject. Here, materials with high dielectric constant and low dielectric loss, consisting of two superposed gradient multiwall carbon nanotube (MWCNT)/cyanate ester (CE) composites, coded as [g-MWCNT/CE] 2 , were uniquely prepared. When the loading of MWCNTs is 0.5 wt %, either MWCNT0.5/CE or [g-MWCNT0.5/CE] 2 composite shows the largest dielectric constant of its corresponding type of composites, the value is 136 or 306 (at 1 Hz); meanwhile, the dielectric loss tangent at 1 Hz of [g-MWCNT0.5/CE] 2 material is 0.21, only about 2.9 × 10 −5 times the value of the MWCNT0.5/CE composite. By investigating the distribution of space charges, the unique dielectric behavior of the [g-MWCNT/CE] 2 materials is found to result from the reinforced space charge polarization and subdued leakage current induced by the presence of the "conductor fault" between the two superposed gradient composites. These interesting data suggest that the special structure of [g-MWCNT0.5/CE] 2 materials is beneficial to fabricate high-k composites with low dielectric loss.

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Section: Resultsmentioning

confidence: 99%

High-k Materials with Low Dielectric Loss Based on Two Superposed Gradient Carbon Nanotube/Cyanate Ester Composites

et al. 2013

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“…Figures 4 to 7 show the space charge distribution and electric field distribution immediately after application of a DC electric field (3 kV/mm) in the samples treated at room temperature (24 °C) and at 40, 65, and 85 °C. The diagrams indicate a periodic pattern of positive and negative space charge distribution, which can be explained by the charge induced due to a nonuniform permittivity to conductivity ratio in the laminated paper/phenol-resin structure [10]. However, we did not correct for this effect in the space measurement.…”

Section: Space Charge Distribution and Electric Field Distributionmentioning

confidence: 93%

Effect of water absorption temperature on space charge profiles in paper/phenol-resin composites for printed circuit boards

et al. 2010

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SUMMARYMore and more electronics are intended for use in adverse environments at high temperatures with high humidity. The spatial distributions of internal charge carriers, mainly due to ionic impurities that appear in hot and humid environments, are considered to affect the reliability of bulk insulation. Therefore, the authors examined space charge behavior inside paper/phenol-resin composites for printed circuit boards under DC voltages, focusing on the effect of the water absorption temperature. Both the sample weight and thickness were increased monotonically by immersion in water with an increase in the water temperature from 24°C to 85 °C, indicating that the water absorption by the sample was temperature dependent. In the early periods of water absorption (up to 10 hours), the electric field decreased near the two electrodes and increased in the other regions. Furthermore, heterocharge formation was observed near the cathode as the water absorption progressed, becoming more significant at higher water temperatures. Ion chromatography analyses detected numerous ions such as Na + , NH 4 + , and Cl -from the water, in which the sample had been immersed for 100 hours at various temperatures. It is highly possible that these ions are responsible for the heterocharge formation.

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“…Much work has been done on the properties of breakdown and space charge in epoxy resins and micro/nanofiller epoxy composites . Being a layered structure rather than an even mixture, the mechanism of epoxy/paper composite is totally different from that of micro/nanofiller epoxy composites . The property of space charge in such epoxy/paper composite insulation materials, which have a layered structure, has not been thoroughly discussed earlier.…”

Section: Introductionmentioning

confidence: 99%

Study on the properties of space charge and breakdown for epoxy–paper composites

Cao

Shen

2015

IEEJ Trans Elec Electron Eng

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The properties of space charge and breakdown in epoxy/paper composites are studied in this paper. The results show that the breakdown voltage of the epoxy/paper composite is lower than that of the epoxy under AC voltage but is higher under DC voltage. In order to explain this phenomenon, the space charge behavior is investigated. In epoxy/paper composites, the space charges easily accumulate at the epoxy/paper interface at low fields, and the electric field distribution is highly deformed. However, the amount of interface charges decreases with increasing voltage, leading to a more uniform field distribution in the composites. This behavior is different from that of the pure epoxy, resulting in the different breakdown properties of pure epoxy and epoxy/paper composites. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Space charge distributions in glass fibre/epoxy resin composites under dc 10 kV mm⁻¹electric field

Cited by 25 publications

References 10 publications

High-k Materials with Low Dielectric Loss Based on Two Superposed Gradient Carbon Nanotube/Cyanate Ester Composites

High-k Materials with Low Dielectric Loss Based on Two Superposed Gradient Carbon Nanotube/Cyanate Ester Composites

Effect of water absorption temperature on space charge profiles in paper/phenol-resin composites for printed circuit boards

Study on the properties of space charge and breakdown for epoxy–paper composites

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Space charge distributions in glass fibre/epoxy resin composites under dc 10 kV mm−1electric field

Cited by 25 publications

References 10 publications

High-k Materials with Low Dielectric Loss Based on Two Superposed Gradient Carbon Nanotube/Cyanate Ester Composites

High-k Materials with Low Dielectric Loss Based on Two Superposed Gradient Carbon Nanotube/Cyanate Ester Composites

Effect of water absorption temperature on space charge profiles in paper/phenol-resin composites for printed circuit boards

Study on the properties of space charge and breakdown for epoxy–paper composites

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Product

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Space charge distributions in glass fibre/epoxy resin composites under dc 10 kV mm⁻¹electric field