Nuclear technology and ageing

Banford, H.M.; Fouracre, R.A.

doi:10.1109/57.793826

Cited by 60 publications

(25 citation statements)

References 12 publications

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“…The amount of phenyl in the main chain plays a main role in the result of the radiation reaction, which is consistent with the result of Hanai [28]. In another word, the resistance to the tracking failure of polybutylene polymers was improved for PBN which contains more combined phenyls in the main chain [20]. Comparing the molecular structures of PET and PBT, there are four methylene groups in the chain of PBT but two for PET.…”

Section: Resultssupporting

confidence: 86%

“…Under the reduced atmospheric pressure, the density of the gases was decreased, the speed of electron became fast, and the surface more readily caused the discharging. As a result, the discharge quantity increased with the decrease of the atmospheric pressure [20]. The discharge quantity decreased with decreasing the atmospheric pressure for PBT.…”

Section: Resultsmentioning

confidence: 82%

“…A cross-linking reaction of an organic material is one main factor for improving tracking resistance and conversely a degradation reaction is conceivable as a factor for decreasing tracking resistance. The atoms that make up a polymer are bounded together by weak covalent bonds that are disrupted easily by gamma-ray radiation, and as bonds are broken, new ones are formed and the structure of the polymer is altered [20]. In practice, cross-linking and degradation reaction often occur simultaneously, and the reaction result is determined by the one that is dominant [12].…”

Section: Resultsmentioning

confidence: 99%

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Effects of atmospheric pressure on tracking failure of gamma-ray irradiated polymer insulating materials

Liu

2010

IEEE Trans. Dielect. Electr. Insul.

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With the increasing application of electric and electronic devices in space and nuclear power stations, the polymer insulation materials are inevitably exposed to various kinds of environments. As technology advances, increasing demands on the reliable operation under various operating and environmental conditions are made on materials and components. Therefore, it is important to investigate the influence of radiation on polymeric insulating materials used under the combined environments. This paper describes the effects of atmospheric pressure and gammaray irradiation on tracking failure of polybutylene naphthalate (PBN), polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) by applying a DC pulse voltage. PBN, PET and PBT were irradiated in air up to 100 kGy and then up to 1000 kGy with a dose rate of 10 kGy/h by using a 60 Co gamma-source. The effects of total dose of irradiation and atmospheric pressure on the time to tracking failure and discharge quantity were discussed. Obtained results show that, with increasing the total dose, the time to tracking failure increased with PBN and PET, but decreased with PBT. With decreasing the atmospheric pressure, the time to tracking failure increased with PBN, PET and PBT. While increasing the total dose, the discharge quantity decreased with PBN and PET, but increased with PBT. With decreasing the atmospheric pressure, the discharge quantity increased with PBN and PET, but decreased with PBT. The experimental results suggest that the chemical structure of the polymeric insulating materials plays a main role in the result of radiation reaction, which is related to cross-linking and degradation reaction.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

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Effects of atmospheric pressure on tracking failure of gamma-ray irradiated polymer insulating materials

Liu

2010

IEEE Trans. Dielect. Electr. Insul.

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“…4 The dielectric properties are worsened for Pl'O by gamma-ray irradiation, which is attributed to the radiation-induced cross-linking and degradation. In practice, cross-linking and degradation reaction often occur simultaneously, and the reaction result is determined by the one that is dominating [6]. For PPO, the irradiation shortened the time to dielectric breakdown, which indicated that the cross-linking reaction was superior to the degradation and the combination between the molecules extended the three-dimensional networks by creating net-likes.…”

Section: Resultsmentioning

confidence: 97%

The investigation on tracking failure of gamma-ray irradiated Polyphenylene Oxide

Liu

Wang

et al. 2009

2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials

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“…For PBT, the irradiation shortens the time to surface breakdown, which indicates that the degradation reaction is superior to the cross-linking reaction. The degradation reaction leads the scission of the main chain bonds which results in the formation of low-molecular-weight fragments and worsen the materials dielectric character [10].…”

Section: A Effects Of Irradiationmentioning

confidence: 99%

Surface breakdown of gamma-ray irradiated polybutylene polymers under magnetic field

Liu

2007

2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena

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Polymer materials are usually used as insulation in nuclear systems and space-based electrical systems. For the use of materials in such regions, it must be confirmed whether the electrical performance was affected by radiation and magnetic field. This paper investigates surface breakdown of irradiated polybutylene polymers under magnetic field. The samples were irradiated in air up to 100 kGy and then up to 1000 kGy with dose rate of 10 kGy/h by using a 60 Co gamma source. The magnetic flux density (MFD) was 249 mT. The magnetic field was perpendicular to the electric field, which made the relative angle between the sample surface and the directions of E×B was 0, 90 and 180 degree. The effects of total dose of gamma-ray irradiation and the relative angle on the time to surface breakdown were discussed. Obtained results indicated that with the increase of the total dose of irradiation, the time to surface breakdown increased with PBN, but decreased with PBT. Under magnetic field, the time to surface breakdown of both PBN and PBT were delayed when the relative angles were 0 and 90 degree, but were shortened when the relative angle was 180 degree.

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Nuclear technology and ageing

Cited by 60 publications

References 12 publications

Effects of atmospheric pressure on tracking failure of gamma-ray irradiated polymer insulating materials

Effects of atmospheric pressure on tracking failure of gamma-ray irradiated polymer insulating materials

The investigation on tracking failure of gamma-ray irradiated Polyphenylene Oxide

Surface breakdown of gamma-ray irradiated polybutylene polymers under magnetic field

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