Effect of surface fluorination on space charge behavior in multilayered polyimide films

Du, B. X.; Li, Jie; Du, Heng; Yin, Yi

doi:10.1109/tdei.2014.004306

Cited by 29 publications

(6 citation statements)

References 27 publications

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“…For example, various kind of plasma treatments of cellulose paper have been utilized to enhance their hydrophobicity [18][19][20]. As one of the most commonly used surface modification method, gas-phase fluorination has already been used to modify the surface charge and space charge dynamics of polymer such as polyethylene, polypropylene, polyimide and epoxy resin [21][22][23][24]. Previous studies also show that the surface charge dissipation of oil-impregnated cellulose insulation paper under DC and pulse voltage could be accelerated by gas-phase fluorination [25].…”

Section: Introductionmentioning

confidence: 99%

Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Wang

Khan

et al. 2019

Applied Sciences

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The surface charge and space charge accumulation in paper used in oil-paper insulation system may distort electric field distribution and lead to the flashover and breakdown of insulation system. In this paper, the effect of gas-phase fluorination on the surface charge and space charge characteristics of oil-impregnated Nomex paper was investigated. Nomex T410 was fluorinated at 25 • C using F 2 /N 2 mixtures with 20% F 2 in volume at 0.05 MPa for 15, 30 and 45 min. Fourier Transform Infrared Spectroscopy (FTIR) proved that the molecular chain scission and cleavage occurred during gas-phase fluorination. Furthermore, the surface charge and space charge characteristic of the original and fluorinated oil-impregnated paper were measured using an electrostatic voltmeter and Pulsed Electroacoustic (PEA) equipment respectively. Furthermore, the hole and electron trap distribution of the samples were obtained by Isothermal Surface Potential Decay (ISPD) model. The results showed that both the positive and negative charge decay rates were accelerated by gas-phase fluorination and the hole, electron trap energy and density of the fluorinated samples were reduced by fluorination. It is suggested that the space charge dissipation was also accelerated by fluorination, indicating that gas-phase fluorination is an effective approach to modify the charge dynamics of oil-impregnated Nomex paper.

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Section: Introductionmentioning

confidence: 99%

Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Wang

Khan

et al. 2019

Applied Sciences

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“…The trap become shallower, accelerating the transport and reducing the charge accumulation [97–100, 102, 103], including positive and negative charges [99]. Diminishing charge accumulation is contributed to weaken the electric field distortion on the surface, which improves the surface flashover voltage.…”

Section: Materials Modificationmentioning

confidence: 99%

Improvement of surface flashover in vacuum

2020

High Voltage

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Surface flashover of insulation systems is a basic issue in the field of high voltage and electrical insulation. To improve the surface flashover performance is of great significance for the development of advanced power transmission equipment and insulation materials. This study reviews the research progress of surface flashover in vacuum regarding to effective methods to improve the surface flashover performance in vacuum, including insulation system optimisation and material modification. The former one is beneficial to reduce the electric field distortion, and the later one is able to adjust the surface trap parameters of the material through physical and chemical methods. In addition, the 'U-shaped' curve is proposed to reveal the relationship between surface flashover voltage and surface trap level, discovering the synthetic effects of surface traps on surface flashover. It is expected that the 'U-shaped' curve will become a guidance to improve surface flashover performance through adjusting trap parameters. Moreover, several suggestions are made to build unified surface flashover model which is suitable to the range from high vacuum to high pressure.

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“…For example, An et al [20,21] indicated that surface fluorination of PE has a significant influence on the charge injection and accumulation. Du et al [22,23] found that surface fluorination is an effective method for modulating the electrical properties and restraining the surface charge and space charge accumulation of the PI film.…”

Section: Introductionmentioning

confidence: 99%

Enduring and Stable Surface Dielectric Barrier Discharge (SDBD) Plasma Using Fluorinated Multi-Layered Polyimide

Bian

Wang

2018

Polymers

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Abstract:In this work, multi-layered polyimide (PI) films were surface fluorinated at 328 K and 0.05 MPa using F 2 /N 2 mixture with 20% F 2 by volume, for a fluorination time of 0, 30 and 60 min, respectively. Then, they were subjected to discharge plasma as barrier dielectrics of surface dielectric barrier discharge (SDBD) at ambient atmospheric air. The dielectric lifetime of SDBD greatly extends after 60 min surface fluorination. In addition, optical emission spectroscopy (OES) results indicate that during the plasma processing, SDBD with fluorinated PI can obtain more stable plasma parameters, including gas temperature and electron temperature. Dielectric surface properties were further evaluated by infrared thermography, scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). It is considered that both physical and chemical effects lead to the extension of dielectric lifetime. The physical effect is reflected in low surface temperature and increased surface roughness, while the chemical effect is reflected in the graft of fluorine groups.

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Effect of surface fluorination on space charge behavior in multilayered polyimide films

Cited by 29 publications

References 27 publications

Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Accelerated Charge Dissipation by Gas-Phase Fluorination on Nomex Paper

Improvement of surface flashover in vacuum

Enduring and Stable Surface Dielectric Barrier Discharge (SDBD) Plasma Using Fluorinated Multi-Layered Polyimide

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