Charge Accumulation in Various Electron‐Beam‐Irradiated Polymers

Nagasawa, K.; Honjoh, M.; Miyake, Hiroaki; Watanabe, Rikio; Tanaka, Yasuhiro; Takada, Tatsuo

doi:10.1002/tee.20553

Cited by 12 publications

(6 citation statements)

References 8 publications

(9 reference statements)

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“…Polyimide (PI) is also used for the materials of multilayer insulators (MLIs) of spacecraft. Many researchers studied space charge characteristics in PI irradiated by electron [8,9]. And recently, the space charge behavior in PI irradiated by proton is also focused.…”

Section: Polyimide For Space Applicationmentioning

confidence: 99%

“…The space charge [8] distributions in Kapton®500H (Dupont-Toray Co.Ltd., nominal thickness is 125 μm, a surface with Al evaluation layer) are irradiated by an electron are discussed. The electron beam irradiation condition is 40 and 60 keV, with 40 nA/cm 2 current density in 10 −5 Pa order vacuum chamber.…”

Section: Negative Charge Accumulation In Pi Irradiated By An Electronmentioning

confidence: 99%

“…The electron beam irradiation condition is 40 and 60 keV, with 40 nA/cm 2 current density in 10 −5 Pa order vacuum chamber. The insite space charge measurements were carried out using PIPWP method [1,8,11]. Charge distributions and integrated charge amount in the bulk are shown in Figures 12 and 13, respectively.…”

Section: Negative Charge Accumulation In Pi Irradiated By An Electronmentioning

confidence: 99%

See 2 more Smart Citations

Space Charge Accumulation Phenomena in PI under Various Practicable Environment

Miyake¹,

Tanaka²

2021

Polyimide for Electronic and Electrical Engineering Applications

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Polyimide is widely used insulation materials, such as power equipment, motor windings, multi layer insulated, and so on. As the operation environment is high temperature, high humidity, radiation, the dielectric insulation characteristic is decreased compared with pristine one. Especially, the space charge characteristics are obtained big different. Furthermore, the breakdown phenomenon is frequently produced. In this chapter, we discuss the dielectric phenomena through the viewpoints of charge accumulation under the following environment. High temperature, High humidity, DC application, PWM application, Radio-active rays (electron, proton).

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Section: Polyimide For Space Applicationmentioning

confidence: 99%

Section: Negative Charge Accumulation In Pi Irradiated By An Electronmentioning

confidence: 99%

Section: Negative Charge Accumulation In Pi Irradiated By An Electronmentioning

confidence: 99%

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Space Charge Accumulation Phenomena in PI under Various Practicable Environment

Miyake¹,

Tanaka²

2021

Polyimide for Electronic and Electrical Engineering Applications

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“…Then, the negative charge distribution was observed in the region of z=055 m, which is outside the irradiated region (z=5598 m). The mechanism of negative charge accumulation outside the irradiated region has been discussed elsewhere [10].…”

Section: Space Charge Accumulation Characteristicsmentioning

confidence: 99%

Determination of charge-trapping sites in saturated and aromatic polymers by quantum chemical calculation

Takada

Kikuchi

Miyake

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

122

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We studied the trapping of positive and negative charges in the chemical structures of polymers under a high electric field using a space charge measurement system. Positive charges accumulated in low-density polyethylene (LDPE), whereas positive and negative charges accumulated in polyimide (Kapton ® ) and also in ethylene tetrafluoroethylene (ETFE) subjected to electron beam irradiation. To determine the charge-trapping sites in the chemical structures, a quantum chemical calculation was carried out using Density Function Theory (DFT) with Gaussian 09. The relationship between the energy band and the isosurface of orbital electrons at various energy levels was obtained. A threedimensional (3D) electrostatic potential distribution map was obtained for positively and negatively charged polymers to determine the relationship between a trapping site and the charge accumulation center in the 3D potential distribution map. Positive and negative charges in Kapton and ETFE films are trapped in trapping sites in chemical structures and the positive charges in an LDPE film are trapped in physical defects.

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“…The thickness of them is about m. The charge distributions were measured shortly after 20 minutes electron irradiation. The observation was carried out using by PIPWP method [5]. The experimental conditions of irradiation energy and current density were 40keV and 70nA/cm 2 , respectively.…”

Section: Space Charge Accumulation In Dielectric Materialsmentioning

confidence: 99%

Numerical estimation of trap depth in polymeric materials using molecular orbital method

Hayase

Osada

Takada

et al. 2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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Trap depth in polyethylene was numerically estimated using calculation of molecular orbital method. In polymeric material, electric conduction seems to be strongly affected by the existence of carrier traps. Therefore the estimation of trap depth is one of important factors for electrical characterization of polymeric materials. However, there are not so many examples to estimate the trap depth. Therefore, authors have tried to calculate it assuming a model of energy band structure and electron orbital using molecular orbital method. By the numerical calculation, the trap depths for electrons and holes formed around carbonyl grope in polyethylene were obtained. Since pure polyethylene doesn't have any localized state to capture carriers, a trap site derived from naturally included impurities like carbonyl group may play a role of trap site in polyethylene. On the other hand, in the case of polyimide, which has benzene ring in main chain, the traps are formed on the structure of main chain around the benzene rings. It means that polyimide originally has the traps in main chain. The depths for negative and positive carriers were also numerically.

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Charge Accumulation in Various Electron‐Beam‐Irradiated Polymers

Cited by 12 publications

References 8 publications

Space Charge Accumulation Phenomena in PI under Various Practicable Environment

Space Charge Accumulation Phenomena in PI under Various Practicable Environment

Determination of charge-trapping sites in saturated and aromatic polymers by quantum chemical calculation

Numerical estimation of trap depth in polymeric materials using molecular orbital method

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