Effect of Dose Rate on Degradation Behavior of Insulating Polymer Miaterials

Kuriyama, Isamu; Hayakawa, Naohiro; Nakase, Yoshiaki; Ogura, Junji; Yagyu, Hideki; Kasai, Ken‐ichi

doi:10.1109/tei.1979.298231

Cited by 43 publications

(11 citation statements)

References 2 publications

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“…This difference is attributed to the radiation-induced cross-linking and degradation. The effect of the total dose on electrical properties is markedly different, depending on the chemical structure of the base polymer [26]. The radiation adds a particular dimension to the aging problem, because it interacts strongly with materials in general and brings about structural changes that alter their properties [21].…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…through mechanisms like cross-linking and degradation (e.g., chain scission, oxidation) [15]. In practice, cross-linking and degradation reactions occur simultaneously and the reaction result is determined by the one dominant [21]. As dielectric surface strength of PBN is improved by the irradiation, it is suggested that the crosslinking reaction exceeds the degradation reaction.…”

Section: Effect Of Gamma-ray Irradiationmentioning

confidence: 99%

Tracking failure of gamma-ray irradiated polybutylene polymers under magnetic field

Gao

Fu³

et al. 2011

Polymer Degradation and Stability

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“…It is considered that the dielectric performance improves by gamma-ray radiation. The effect of the total dosage on the dielectric performance is distinctly different, depending on the chemical structure of the base polymer [3,5,15,16]. Comparing the molecular formulae, there are two phenyls in the main chain of PBN but one phenyl in that of PBT.…”

Section: Rps Of Discharge Currentmentioning

confidence: 99%

“…The subsequent change in the tracking failure can be generated by gamma-ray radiation by altering the molecular structure [2]. Evaluation of the radiation effects on the dielectric property is very complex since the resistance to tracking depends on the radiation dosage and the kinds of polymer materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

HF laser pumped by a generator with an inductive energy storage unit

1997

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Polymers are required to use in radiation environments as insulation materials. However, they often suffer from tracking failure. There is an increasing demand to evaluate radiation effects on dielectric performance. This paper presents a recurrence plot (RP) approach to analyse surface discharge sequences of gamma-ray irradiated polymer materials based on tracking test. Studying the non-linear characteristics of discharge sequences can assist in understanding the underlying mechanism of the discharge process. Discharge sequences of the test are extended to m-dimensional phase space by using the phase space reconstructed method. As test samples, polybutylene terephthalate (PBT) and polybutylene naphthalate (PBN) were irradiated to 100 kGy and then up to 1 MGy with a dosage rate of 10 kGy h −1 by using a 60 Co gamma source. The tracking tests were carried out according to the test method described in IEC60112. It is found that the RPs can give visual recurrent patterns of discharge sequences for identification of the effects of gamma-ray radiation dosage on the resistance to tracking of the polymers. The detection of recurrent patterns together with comparative tracking index value results indicate that with the increase in the radiation dosage, the resistance to tracking of PBT decreases, but increases for PBN.

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Effect of Dose Rate on Degradation Behavior of Insulating Polymer Miaterials

Cited by 43 publications

References 2 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

Tracking failure of gamma-ray irradiated polybutylene polymers under magnetic field

HF laser pumped by a generator with an inductive energy storage unit

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