Effect of ageing on the dielectric relaxation of oriented and gamma irradiated LDPE

Suljovrujić, E.; Kačarević-Popović, Zorica; Kostoski, D.; Dojčilović, Jablan

doi:10.1016/s0141-3910(00)00187-7

Cited by 38 publications

(14 citation statements)

References 13 publications

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“…The sub-ambient b-relaxation is associated with phenyl ring motions, and while it is influenced by a number of factors such as water content, ageing history and morphology [16], it is reasonable to attribute the increase in intensity with irradiation to the introducing polar groups via oxidation as previously observed on the irradiation of polyethylene [17][18][19]. This is also consistent with the increase of sulphonation degree with irradiation observed in a previous article [4].…”

Section: Details Of Change In the Dielectric Propertiessupporting

confidence: 88%

The effects of ion irradiation on the dielectric properties of poly(ether ether ketone)

Lafi¹

2012

Polym. Bull.

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Temperature-dependent dielectric relaxation spectra of ion irradiated (11.2 MeV H ? and 25.6 MeV He 2? ) poly(ether ether ketone) (PEEK) were measured at frequencies between 50 and 10 5 Hz. The data were analysed by both ColeCole and Kohlrausch-Williams-Watts equations. b KWW values were observed to decrease with irradiation, which was interpreted in terms of the Ngai et al. model as due to the increase of inter-chain coupling between the relaxing units caused by the additional constraints introduced by the cross linking. The effect of irradiation was also discussed in terms of local motion by studying the low temperature b-relaxation in PEEK. Polar groups were attached to the phenyl rings by irradiation as evident from the progressive increase in the b-relaxation peak intensity with dose.

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Section: Details Of Change In the Dielectric Propertiessupporting

confidence: 88%

The effects of ion irradiation on the dielectric properties of poly(ether ether ketone)

Lafi¹

2012

Polym. Bull.

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“…The dominance of one or the other of these processes, in the same irradiation conditions, is controlled by structural peculiarities of the polymers [12][13]. It was shown previously that the resistance and breakdown voltage in polyethylene is not affected very much by variation in the absorbed dose of electron beam radiation [6].…”

Section: Resultsmentioning

confidence: 99%

“…It is evident that the increase in the carbonyl content is caused by the electron beam irradiation, and the accelerated aging caused decrement in the resistance and the breakdown voltage in the samples (Figures 3 and 4, respectively). Suljovrujic et al [12] found out that there are two different carbonyl groups because of significant growth in the absorption at about 1700 cm À1 and breadth of the carbonyl region, using IR analysis. The carbonyl groups are mainly ketone groups at 1718 cm À1 and aldehyde groups at 1728 cm À1 and both are formed in the amorphous region of the polymer [14].…”

Section: Resultsmentioning

confidence: 99%

“…The carbonyl groups are mainly ketone groups at 1718 cm À1 and aldehyde groups at 1728 cm À1 and both are formed in the amorphous region of the polymer [14]. Aldehyde-end groups are formed by decomposition of peroxides and hydroperoxides in the polymer, or by a rearrangement of the peroxy radical intermediate, caused by chain scission [12]. The relative contribution of aldehydes and ketones depends on the competition between the chain scission reactions and decomposition of hydroperoxides in which water is produced.…”

Section: Resultsmentioning

confidence: 99%

“…It has been established that the concentration of polar groups increases with aging as a result of post-irradiation weathering [12]. Another important aging process involved (main) chain scission.…”

Section: Resultsmentioning

confidence: 99%

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Electrical Properties of 10 MeV Electron Beam Irradiated and Aged Low Density Polyethylene

Ziaie¹,

Ziaee

2011

International Journal of Polymeric Materials

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Polymers play a very important role in electrical systems as insulation materials. The microscopic failures occurring in the polymer under working conditions will be important in its required characteristics. In this work we focused on the effects of accelerated aging on the electrical properties of low density polyethylene (LDPE) and crosslinked polyethylene (XLDPE). The samples of LDPE were prepared in sheet form with the thickness of 0.6 AE 0.1 mm and were irradiated under the 10 MeV electron beam of a Rhodotron accelerator at the dose range of 70 to 370 kGy. Then, the samples were stored in an oven at temperature 75 C for 3, 6, 10 and 13 days. Electrical properties such as the breakdown voltage and resistance of the aged samples were measured and compared. Increasing the aging time for unirradiated samples has a serious and moderate influence on their surface resistivity and breakdown voltage, respectively. The results indicated a maximum value for the surface resistance at the optimum radiation absorbed dose, which is approximately 220 kGy for all the samples.

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Dielectric Analysis (DEA)

Vassilikou‐Dova

Kalogeras

2008

Thermal Analysis of Polymers

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Effect of ageing on the dielectric relaxation of oriented and gamma irradiated LDPE

Cited by 38 publications

References 13 publications

The effects of ion irradiation on the dielectric properties of poly(ether ether ketone)

The effects of ion irradiation on the dielectric properties of poly(ether ether ketone)

Electrical Properties of 10 MeV Electron Beam Irradiated and Aged Low Density Polyethylene

Dielectric Analysis (DEA)

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