Product analysis for polyethylene degradation by radiation and thermal ageing

Sugimoto, Masaki; Shimada, Akihiko; Kudoh, Hisaaki; Tamura, Kiyotoshi; Seguchi, Tadao

doi:10.1016/j.radphyschem.2012.08.009

Cited by 76 publications

(52 citation statements)

References 8 publications

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“…A broad band formed in the carbonyl region with a maximum at 1715 cm À1 and of two weak shoulders with maxima at approximately 1730 cm À1 and 1780 cm À1 . These modifications of the infrared spectra observed during exposure of EVOH fit quite well those reported in the case of polyethylene photooxidation [44,45]. Formation of absorption bands at 1640 cm À1 and 910 cm À1 can also be noticed and can be attributed to double bonds, as observed in the case of PE photooxidation [46] (Scheme 2).…”

Section: Ir Analysissupporting

confidence: 85%

Influence of zeolite nanoparticles on photostability of ethylene vinyl alcohol copolymer (EVOH)

Topolniak

Gardette

Thérias

2015

Polymer Degradation and Stability

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Section: Ir Analysissupporting

confidence: 85%

Influence of zeolite nanoparticles on photostability of ethylene vinyl alcohol copolymer (EVOH)

Topolniak

Gardette

Thérias

2015

Polymer Degradation and Stability

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“…The inset focuses on the region of 1,800–1,650 cm −1 which describe the complex band of the

υ true(normalC = normalO)

carbonyl group vibrations. This band is a combination of overlapping individual bands attributed to specific groups such as aldehydes 1,733 cm −1 (1,740–1,733 cm −1 ), carboxylic acid groups 1,700 cm −1 (1,708–1,698 cm −1 ), ketones 1,714 cm −1 (1,723–1,713 cm −1 ) and lactones 1,780 cm −1 (1,786–1,780 cm −1 ) . Vibrational bands of

υ true(normalC - normalO)

are observed in a region of 1,100–1,000 cm −1 for exposed films and have a strong band in 1,170 cm −1 .…”

Section: Resultsmentioning

confidence: 98%

Characterization of surface phenomena: probing early stage degradation of low‐density polyethylene films

Hirsch

Barel

Segal

2018

Polymer Engineering & Sci

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Photo‐oxidative degradation of polyethylene triggers significant deterioration in the polymer properties. Much interest is aimed at characterizing and possibly predicting photo‐oxidative damages, at early stages, prior to the occurrence of profound changes in mechanical properties. Herein, we study the degradation of low‐density polyethylene (LDPE) films, focusing on surface deterioration processes. Thin films of various molecular weights are exposed to accelerated weathering while their chemical, mechanical and morphological characteristics are monitored throughout by apparent contact angle (CA) measurements, Fourier‐transform infrared spectroscopy (FTIR), tensile test, and electron microscopy. A significant decrease in the films' CA during degradation is observed. CA is highly sensitive to two simultaneous phenomena with opposing effect: nanoscale surface roughening and composition changes. We found the latter (specifically the evolution of polar groups) to be the dominant parameter affecting the CA behavior. Consequently, simple CA measurements coincide well with conventional FTIR analysis, and are more sensitive to changes occurring at early stages of degradation. The deterioration in the mechanical properties is also characterized and is found to present poor sensitivity and high variability at these early aging stages. Thus, simple CA measurements could potentially be used as a qualitative indicator for evaluating the aging impact on LDPE. POLYM. ENG. SCI., 59:E129–E137, 2019. © 2018 Society of Plastics Engineers

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“…Therefore, no effect due to the decay of antioxidant during thermal oxidation was observed for SiR, unlike that for XLPE or EPR [10][11][12] at the higher temperature. The degradation for the combination of thermal ageing and radiation ageing, that is, (1) the simultaneous ageing, (2) sequential ageing and (3) reverse sequential ageing was compared for SiR-B sheet specimens (2 mm).…”

Section: Mechanical Propertiesmentioning

confidence: 86%

“…In our previous studies, the mechanical properties and chemical reactions were investigated for EPR and XLPE by the accelerated ageing using various experimental techniques [10][11][12][13][14]. The same technique was applied to SiR insulation material and the degradation mechanism was elucidated.…”

Section: Introductionmentioning

confidence: 99%

Degradation mechanisms of silicone rubber (SiR) by accelerated ageing for cables of nuclear power plant

Shimada

Sugimoto

Kudoh

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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The degradation behavior of SiR for the cable insulation by accelerated thermal and radiation ageing was studied and the degradation mechanism was proposed. The degradation was observed by the change of tensile properties, the distribution of crosslinking, and the change of weight. The chemical reaction under the both ageing in oxidation conditions was crosslinking and the oxidation mechanism was found to be the same between thermal and radiation ageing. The yield of crosslinking was proportional to the ageing time and also the dose. The effect of irradiation temperature on oxidation was accelerated with an increase of temperature above around 120 0 C, which might be due to the specific radiation chemical reactions. Therefore, the degradation by simultaneous ageing at higher temperatures above 155 0 C was much higher than that for sequential ageing, such as irradiation followed by thermal ageing or thermal ageing followed irradiation. At a high temperature, the degradation by thermal ageing under vacuum (without oxidation) was more progressed than that for the ageing in air (with oxidation). The reason was assumed to be the thermal decomposition of crosslinks between SiR molecules formed by the chemical crosslinking agent. The hardness (Shore hardness) reflected well the degradation of the SiR material for any ageing conditions.

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Product analysis for polyethylene degradation by radiation and thermal ageing

Cited by 76 publications

References 8 publications

Influence of zeolite nanoparticles on photostability of ethylene vinyl alcohol copolymer (EVOH)

Influence of zeolite nanoparticles on photostability of ethylene vinyl alcohol copolymer (EVOH)

Characterization of surface phenomena: probing early stage degradation of low‐density polyethylene films

Degradation mechanisms of silicone rubber (SiR) by accelerated ageing for cables of nuclear power plant

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