Chemical group in crosslinking byproducts responsible for charge trapping in polyethylene

Hirai, Naoshi; Minami, Ryotaro; Tanaka, Toshikatsu; Ohki, Yoshimichi; Okashita, M.; Maéno, Takashi

doi:10.1109/ceidp.2002.1048874

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…These values are similar to the values that are reported in [9]. It is worth addressing here that this percentage weight of byproducts per sample film is not relative to the actual percentage of the byproducts in commercial XLPE, as emphasised before the focus of this research is to compare the effect of the three byproducts in space charge accumulation.…”

Section: Sample Preparationsupporting

confidence: 72%

Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Hussin

Chen

2012

IEEE Trans. Dielect. Electr. Insul.

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Cross-linking byproducts are suspected to be the main contributing factor in space charge formation observed in XLPE. To investigate the mechanism behind this phenomenon, low density polyethylene was soaked into three main crosslinking byproducts, acetophenone, -methylstyrene and cumyl alcohol, and space charge measurements were performed using the Pulse Electroacoustic technique (PEA). It has been found that soaking LDPE in cumyl alcohol introduces more charges into the system, with homocharges and heterocharges accumulating within the sample compared to the additive free sample. In contrast, -methylstyrene and acetophenone reduce the amount of accumulated charges. In terms of charge decay, all three byproducts enhance the decay process in the insulator. Further investigations were conducted in conditions where two byproducts are present in a sample. The results shows that acetophenone is a dominant byproduct in determining the charge density patter built up during the charging process, whilst the rate of charge decay is observed to be high in the presence of -methylstyrene in the sample.

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Section: Sample Preparationsupporting

confidence: 72%

Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Hussin

Chen

2012

IEEE Trans. Dielect. Electr. Insul.

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“…Firstly, the interfacial area between the OvPOSS nanofiller and the base PP is significantly increased in the bulk of nanocomposites due to the smaller size of the OvPOSS nanofiller compared to some traditional inorganic nanofillers. As a result, interface energy is dramatically raised, and more deep traps can be introduced into the matrix material [2]. Secondly, when the charges flow through the insulation material, the deep traps with high density would reduce the charge injection and trap the charge carriers so that the mobility of hot electrons could be decreased significantly in the solid insulation materials (see Figures 5 and 6).…”

Section: Resultsmentioning

confidence: 99%

“…XLPE, on the other hand, is manufactured through the crosslinking process of LDPE to achieve better mechanical properties and thermal stability than those of LDPE. However, some crosslinking impurities, including cumyl alcohol, phenol, and acetophenone, would be introduced into the bulk material and these might shorten the lifespan of XLPE in the long‐term when used under HVDC [2]. Additionally, it is difficult to recycle XLPE due to its thermoset classification.…”

Section: Introductionmentioning

confidence: 99%

Octavinyl polyhedral oligomeric silsesquioxane on tailoring the DC electrical characteristics of polypropylene

et al. 2021

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This work reports the effect of octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) on tuning the electrical performance of polypropylene (PP). OvPOSS with different content are introduced into PP using the solution method. The microstructural morphology, crystallinity behaviour, breakdown strength, DC conductivity, space charge formation, and trapping level distribution are measured. The results indicate that the OvPOSS nanofiller can be dispersed uniformly with a doping content of 2.0 phr or less. The DC conductivity is decreased, and the breakdown strength of OvPOSS/PP nanocomposites is significantly increased. The space charge accumulation of the OvPOSS/PP nanocomposites is significantly suppressed due to the introduction of deeper traps by the OvPOSS nanofiller. Finally, the experimental results demonstrate that the OvPOSS nanofiller can greatly increase the electrical performance of the base PP and the OvPOSS/PP nanocomposites have much potential for HVDC applications. They further demonstrate that the PP is environmental-friendly due to its thermo-plastic property, which can be recycled after the manufacture.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…It is very clear that these give rise to significantly increased charge accumulation and there may be a case for not using PE containing such products for HVDC applications. Hirai et al [69] soaked an additive-free lowdensity polyethylene sheet in various liquid chemicals corresponding to crosslinking by-products and the space charge distribution inside the sheet was measured under DC voltage application. They concluded that the hydroxyl group in the cumyl alcohol was responsible for carrier trapping.…”

Section: Space Charge Measurementmentioning

confidence: 99%

Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

Fothergill

2007

2007 IEEE International Conference on Solid Dielectrics

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Three areas of considerable progress are identified in the area of polymeric insulation since the mid 1990s (i.e. since the inception of the Eric O. Forster Memorial Lectures): the understanding of ageing, the measurement of space charge, and the development of nanodielectrics. The paper proposes a typology to distinguish and define electrical ageing, degradation and breakdown. With reference to the principal theories of thermo-ageing, it is concluded that there is little direct evidence for ageing even though it is likely to exist, at least above a critical field. The capability to measure space charge has improved considerably and this shows considerable potential as a diagnostic tool. Space charge behaviour is extremely difficult to analyse and general predictions may be impossible in practice. It is, however, necessary to control space charge accumulation in HVDC systems. Nanodielectrics continue to offer promise and understanding is improving in this area, particularly in the development of models of interaction zones around nanoparticles.

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Chemical group in crosslinking byproducts responsible for charge trapping in polyethylene

Cited by 10 publications

References 13 publications

Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Octavinyl polyhedral oligomeric silsesquioxane on tailoring the DC electrical characteristics of polypropylene

Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

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