The Effect of Gamma Irradiation on Space Charge Behaviour and Dielectric Spectroscopy of Low-density Polyethylene

Fu, Mingli; Chen, G.; Dissado, L.A.; Fothergill, J.C.; Zou, Chen

doi:10.1109/icsd.2007.4290846

Cited by 17 publications

(12 citation statements)

References 8 publications

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“…It evidently suggests that the ions are more dominating at higher RH in the developed armalcolite nanocomposite . The present relaxation peaks of armalcolite nanocomposite in Figure (at low‐frequency region: 10 2 ‐10 3 Hz) were alike agreement of the reported by Fu et al …”

Section: Resultssupporting

confidence: 90%

Dielectric and AC conductivity studies of novel porous armalcolite nanocomposite‐based humidity sensor

et al. 2017

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Armalcolite, a current motivated rare earth ceramic usually available in the moon, had been used for the first time, as dielectric-type humidity sensors. The armalcolite nanocomposite was prepared using multistep solid-state sintering under high pressure and a high-sensitive dielectric sensor was developed for humidity controlling applications. Different concerning phases developed by the proper sintering were analyzed precisely by X-ray diffraction (XRD) as well as scanning electron microscopy (SEM). At 100 Hz frequency, the obtained dielectric constant was 24 times greater at 95% relative humidity (RH) as compared to 33% RH. The armalcolite-based sensor showed lower hysteresis (<3.5%), good stability, and faster response (~18 seconds) and recovery (~35 seconds) times compared to conventional humidity sensors.The sensing mechanism of the nanocomposite was categorically determined by the analyzed characteristics parameters such as dielectric constants, normalized loss tangent, and alternating current conductivity properties. This study also confirmed that the whole conduction mechanism was accomplished by electrons or ions and dipoles in the entire RH range. Therefore, the present armalcolite-based porous nanocomposite would be a potential sensing material for novel humidity sensors.

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Section: Resultssupporting

confidence: 90%

Dielectric and AC conductivity studies of novel porous armalcolite nanocomposite‐based humidity sensor

et al. 2017

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“…There are three main ways for surface charges to dissipate: (1) migrating to the ground electrode on the back, (2) migrating along the surface by the tangential electric field and entering the earth through the ground electrode, and (3) neutralizing with heterogeneous charges in the air. Which dissipating path dominates depends on various factors such as the surface characteristics of the solid medium, the gas atmosphere, and the electrode structure [17,18]. Since the normal electric field on the film surface is much larger than the tangential electric field in this experiment.…”

Section: The Effect Of Molecular Structure On the Surface Charge Dynamentioning

confidence: 89%

Effect of Molecular Structure Modification and Nano-Doping on Charge Transportation of Polyimide Films for Winding Insulation

Du¹,

Xu²,

Xing³

et al. 2021

Polyimide for Electronic and Electrical Engineering Applications

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Polyimide (PI) is widely employed as winding insulation in high voltage devices, such as extra-high voltage electric reactor and inverter-fed motor. The injection and accumulation of charges on the surface of PI films will lead to electrical field distortion and reduced lifespan of winding insulation, especially for the operation environment of high temperature and high voltage. This chapter focuses on effects of surface molecular modification and nanoparticles on dynamic characteristics of surface charge and space charge of pure PI films, including three sections. The effect of molecular structure on the surface charge dynamics of PI films was studied firstly. The chapter investigated that how molecular structure affects surface charge of polyimide nanocomposite films. Furthermore, the effect of surface molecular modification on space charge characteristics of multilayer PI films was researched. The results illustrate that surface molecular modification and nanoparticles can comprehensively suppress space charge accumulation and improve dielectric property.

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“…High frequencies ε'' modifications are usually attributed to oxidation phenomena while low frequencies ones are often related to additives consumption and structural modification (such as chain scission and crosslinking) [10]. The latter causes interfacial modification between crystalline and amorphous regions of polymers, which is associated to Maxwell-Wagner-Sillars polarization [11].…”

Section: Discussionmentioning

confidence: 99%

About electrical and mechanical behaviour of low-voltage I&C cables used in nuclear power plants

Suraci¹,

Fabiani²,

Bulzaga³

2018

MMC_C

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This paper focuses on the electrical and mechanical properties of irradiated and thermallystressed NPP cables used for instrumentation and control (I&C). These cables show some noteworthy changes after few years of uncontrolled environment conditions due to a phenomenon called post-irradiation effect. Strong post-irradiation effects, e.g. reduction of mechanical properties, raise of crosslinking and oxidation grade, were found on XLPE cable insulation years after irradiation. These degradation mechanisms can be correlated with electrical measurements in which imaginary permittivity values raise, in particular at low-frequencies where interfacial phenomena take place. This behavior can be linked to the increase of interfacial area between amorphous and crystalline region of polymer, supporting the evidence that postirradiation effects can lead to polymer crosslinking during a storage period even at room temperature.

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The Effect of Gamma Irradiation on Space Charge Behaviour and Dielectric Spectroscopy of Low-density Polyethylene

Cited by 17 publications

References 8 publications

Dielectric and AC conductivity studies of novel porous armalcolite nanocomposite‐based humidity sensor

Dielectric and AC conductivity studies of novel porous armalcolite nanocomposite‐based humidity sensor

Effect of Molecular Structure Modification and Nano-Doping on Charge Transportation of Polyimide Films for Winding Insulation

About electrical and mechanical behaviour of low-voltage I&C cables used in nuclear power plants

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