Space charge in LLDPE loaded with nanoparticles

Chen, G.; Zhang, C.; Stevens, G.C.

doi:10.1109/ceidp.2007.4451554

Cited by 20 publications

(16 citation statements)

References 9 publications

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“…Increased charge mobility. In our previous paper [22], it was reported that the addition of nano alumina to LLDPE has three consequences. They are (i) enhancement of charge injection, (ii) ionisation possibly due to impurities of nanofillers and (iii) modification of charge trapping characteristics, leading to an increase in charge mobility.…”

Section: Discussionmentioning

confidence: 99%

Space Charge Formation in Epoxy Resin Including Various Nanofillers

Hajiyiannis

Chen

Zhang

et al. 2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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-It has been widely anticipated that the combination of recent advances in nanocomposites technology with traditional and novel resin systems may create materials with enhanced electrical, thermal and mechanical properties. It has been recognised that charge dynamics under an electric field play an important role in determining the electrical performance of a material. In this research, the pulsed electroacoustic (PEA) technique has been used to measure space charge in epoxy anhydrite samples loaded with various nano-fillers. Space charge characteristics in both dried and wet samples have been measured at ~27 kV/mm. In addition to different charge dynamics, it has also been noticed that the electrical performance of nanocomposites has been affected in the presence of moisture. Further tests have been carried out at a lower field to reveal if different mechanisms take place.

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Section: Discussionmentioning

confidence: 99%

Space Charge Formation in Epoxy Resin Including Various Nanofillers

Hajiyiannis

Chen

Zhang

et al. 2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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“…The addition of a nanofiller to a polymer matrix has been shown to be a flexible means of tailoring the dielectric properties of materials [1][2][3] and Chen et al [19], for example, have emphasized the unsatisfactory nature of our understanding of charge transport mechanisms. In conventional polymeric insulation, charge transport mechanisms are extremely complicated, when compared with many conducting and semiconducting materials [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Although two decades have passed since the nanodielectric concept was first introduced [17], many aspects of these materials are still poorly understood; Cao et al [18] and Chen et al [19], for example, have emphasized the unsatisfactory nature of our understanding of charge transport mechanisms. In conventional polymeric insulation, charge transport mechanisms are extremely complicated, when compared with many conducting and semiconducting materials [20,21].…”

Section: Introductionmentioning

confidence: 99%

Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

Lau

Vaughan

Chen

et al. 2016

J. Phys. D: Appl. Phys.

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The topic of nanodielectrics continues to receive significant attention from today's dielectrics community, due to the property enhancements that can stem from the unique interfacial features within such material systems. Nevertheless, understanding of the interfacial phenomena that occur in nanodielectrics and which determine their electrical behaviour is challenging. In this paper, we report on an investigation into the absorption current behaviour of two nanocomposite systems, one containing an untreated nanosilica and the other containing the same nanofiller chemically modified using trimethoxy(propyl)silane.The results indicate that the absorption current behaviour of all the nanocomposites is very different from that of the reference, unfilled polymer; while the current flowing through the unfilled polyethylene decreased monotonically with time in a conventional manner, all nanocomposites revealed an initial decrease followed by a period in which the current increased with increasing time of electric field application. Possible mechanisms leading to the observed absorption current behaviour in the nanocomposites are discussed with the aid of space charge measurements. The presence of space charge limited conduction (SCLC) and its trap-filled limit is proposed.Keywords: nanocomposites, nanosilica, interface, absorption current, space charge limited conduction. 2 IntroductionThe addition of a nanofiller to a polymer matrix has been shown to be a flexible means of tailoring the dielectric properties of materials [1][2][3] and Chen et al. [19], for example, have emphasized the unsatisfactory nature of our understanding of charge transport mechanisms. In conventional polymeric insulation, charge transport mechanisms are extremely complicated, when compared with many conducting and semiconducting materials [20,21]. In semicrystalline polyethylene, for example, chainfolded lamellar crystals are surrounded by amorphous conformations and there is likely to be a high concentration of traps relating to each of these structural motifs. On the addition of a nanofiller, charge transport mechanisms will become yet more complicated, since the inclusion of nanoparticles will introduce extensive interfacial surfaces between the nanofiller and the polymer. The presence of such interfaces may directly introduce additional nanofiller/polymer trapping sites and/or modify the surrounding polymer morphology, thereby affecting the local density of states within the system.The current flow caused by the action of an applied electric field on charge carriers within a dielectric material can broadly be categorized into three types [22]: the initial current that flows through the material is the capacitive charging current, which causes a dramatic rise at the very beginning of the voltage application. This is followed by a gradual decrease of current, known as the absorption current or the anomalous current. Conventionally, the absorption current decreases slowly until it reaches a quasi-steady state, providing a conduction c...

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“…From the charge profiles, it is clear that the space charge density increases with the increasing dc voltage. It is worth to note that the development of homo-charge is commonly associated with charge injection processes from the electrodes; that is, positive charge injection at the cathode and negative charge injection at the anode [6].…”

Section: Accumulation Of Space Chargementioning

confidence: 99%

The Effects of Nano Fillers on Space Charge Distribution in Cross-Linked Polyethylene

Ramani¹,

Ariffin²,

Vijian³

et al. 2017

IJECE

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The performance of polymeric insulation will be distorted by the accumulation of space charge. This will lead to local electric field enhancement within the insulation material that can cause degradation and electrical breakdown. The introduction of nanofillers in the insulation material is expected to reduce the space charge effect. However, there is a need to analyze potential nanofillers to determine the best option. Therefore, the objective of this research work is to examine two types of nanofillers for Cross-Linked Polyethylene (XLPE); Zinc Oxide (ZnO) and Acrylic (PA40). The effects of these nanofillers were measured using the Pulsed-Electro Acoustic (PEA) method. The development of space charge is observed at three different DC voltage levels in room temperature. The results show that hetero charge distribution is dominant in pure XLPE materials. The use of both nanofiller types have significant effect in decreasing the space charge accumulation. With nanofillers, the charge profile changed to homo-charge distribution, suppressing the space charge formation. Comparison between both the nanofillers show that PA40 has better suppression performance than ZnO.

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Space charge in LLDPE loaded with nanoparticles

Cited by 20 publications

References 9 publications

Space Charge Formation in Epoxy Resin Including Various Nanofillers

Space Charge Formation in Epoxy Resin Including Various Nanofillers

Polyethylene/silica nanocomposites: absorption current and the interpretation of SCLC

The Effects of Nano Fillers on Space Charge Distribution in Cross-Linked Polyethylene

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