Relationship between hydroperoxide concentration and average molar mass in thermo-oxidized polyethylene

Cruz, Manuela Da; Schoors, Laëtitia van; Colin, Xavier; Benzarti, Karim

doi:10.1063/1.4876791

Cited by 1 publication

(2 citation statements)

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“…The termination step involves all possible reactions between the two radicals ROO° and R°. Also, it has been shown in reference [19] that peroxyl radicals could lead to the formation of a pair of alkoxy radicals (RO°) in a cage. In references [19][20], several possible reaction paths are explored leading to a termination and also to a non-terminating combination (diffusion out of the cage leading to the priming of a new oxidation chain).…”

Section: Atr-ftir Spectroscopy Analysismentioning

confidence: 99%

“…Also, it has been shown in reference [19] that peroxyl radicals could lead to the formation of a pair of alkoxy radicals (RO°) in a cage. In references [19][20], several possible reaction paths are explored leading to a termination and also to a non-terminating combination (diffusion out of the cage leading to the priming of a new oxidation chain). Moreover, the reactions of alkoxy radicals could result in the formation of more polar and carbonyl groups such as aldehydes and ketones [21].…”

Section: Atr-ftir Spectroscopy Analysismentioning

confidence: 99%

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Correlations between structural changes and dielectric behavior of thermally aged XLPE

Kemari

Mekhaldi

Teyssèdre

et al. 2019

IEEE Trans. Dielect. Electr. Insul.

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This study aims at elucidating the correlations between structural changes and the variation of dielectric properties of cross-linked polyethylene (XLPE) during thermal aging. For this purpose, thermal aging experiments were carried out on XLPE samples at 80, 100, 120 and 140 °C for different aging times for a maximum total duration of 5040 hours. Chemical changes were assessed by Fourier Transform Infrared Spectrum (FTIR). Besides, the crystallinity ratio and the melting temperature were evaluated using Differential Scanning Calorimetry (DSC). Frequency domain dielectric spectroscopy was used to investigate the evolution of the dielectric constant and losses of XLPE during aging. The results show that aging at 80 and 100 °C could help to improve the crystalline state of XLPE which leads to the decrease of the dielectric constant. However, for higher thermal stress, the main aging mechanism of XLPE is thermal oxidation which leads to deteriorate the morphology and increase both the polarization and losses, mainly at low frequencies. It has been found also that in some cases, the non-homogeneity of the color of XLPE seems to indicate the increase of interfaces in the material which could lead to increase the dielectric losses due to the interfacial polarization.

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Section: Atr-ftir Spectroscopy Analysismentioning

confidence: 99%