Mechanism of antioxidant interaction on polymer oxidation by thermal and radiation ageing

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

doi:10.1016/j.radphyschem.2012.06.011

Cited by 54 publications

(38 citation statements)

References 3 publications

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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%

“…A reliable analysis of the change in the chemical structure with the progress of oxidation for both the SiR specimens could not be observed from the FTIR spectrum; that is, the degradation could not be followed by FTIR analysis as reported for EPR or XLPE in previous papers [10,11]. As the chemical changes on ageing were well reflected in the changes in the gel fraction and the swelling behavior, the distribution of degradation in the sheet samples was determined by measurements of the gel fraction and swelling ratio.…”

Section: Distribution Of Oxidation In Sir Sheet Specimenmentioning

confidence: 93%

“…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%

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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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Section: Mechanical Propertiesmentioning

confidence: 86%

Section: Distribution Of Oxidation In Sir Sheet Specimenmentioning

confidence: 93%

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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.

Self Cite

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“…On the other hand, thermal‐oxidation degradation is one of the most prominent problems in manufacturing of the polymeric products . This process directly affects the aging and shelf life of the polymeric ingredients and products . Unsaturated bonds containing materials such as HTPB are the most affected categories of polymers by the thermal‐oxidation degradation due to the high reactivity of the unsaturated bond in the free radical .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Nazmi

Yarmohammadi

Pedram

et al. 2018

Int J of Chemical Kinetics

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The effect of the mixture of two antioxidants has been evaluated on the thermal‐oxidant degradation of the hydroxyl‐terminated polybutadiene (HTPB) because of its importance in the coatings and adhesives industries. 2,2‐Methylene bis(4‐methyl‐6‐tertiarybutylphenol) or A.O.2246 and 3‐hydroxy pyridine have been considered as antioxidants in this study as a common HTPB antioxidant and an active antioxidant, respectively. The thermal‐oxidant degradation behavior of the HTPB has been investigated in the presence of a mixture of two antioxidants by TGA and DTG tests, and, subsequently, the results of these tests have been interpreted by two model‐free methods, e.g., Kissinger–Akahira–Sunose and Friedman methods. The results revealed that the mixture of two antioxidants affected the activation energy of the thermal‐oxidant degradation reaction of the HTPB. The calculated activation energy value obtained from the Kissinger–Akahira–Sunose method was about 199 ± 1 kJ⋅mol−1. In addition, the Ea value at various conversion rates has also been calculated by using the Friedman method. This method showed that the highest Ea value in the thermal‐oxidant degradation reaction belonged to the initiation step of the reaction (about 299 kJ⋅mol−1). Moreover, the lowest activation energy value was correlated to the second step of the degradation reaction at a conversion rate of 0.6 (about 184 kJ⋅mol−1).

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“…These methods can reduce color fading and the degradation of mechanical properties. Antioxidants were widely used in polymer composites as an effective filler material to decrease oxidative damage mediated by free radicals . Antioxidants can be divided into primary and secondary antioxidants depending on their mode of operation.…”

Section: Introductionmentioning

confidence: 99%

Improving thermo‐oxidative degradation resistance of bamboo fiber reinforced polypropylene composite with antioxidants. Part I: Screening of antioxidants

Ren

Zhang

Wang

et al. 2016

J of Applied Polymer Sci

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In this study, the effect of antioxidant application (applied in different combinations, ratios and contents) on the thermo‐oxidative degradation resistance of bamboo fiber polypropylene composites (BFPCs) were investigated, with oxidative induction time (OIT), weight loss, surface color, and flexural mechanical properties as the main indicators for evaluation. The results showed the addition of antioxidants could greatly increase the OIT and reduce the weight loss and color change of the composites after 900 h of thermal weathering. Meanwhile, the flexural mechanical properties were little affected or even slightly improved. The combination of 1076 and DLTP antioxidants at a ratio of 2:1 and 0.2 wt % content was found to exhibit the best thermal oxidation resistance with respect to the OIT, mechanical properties and cost. Our study indicate that the OIT can serve as a simple and quick indicator for the evaluation of thermo‐oxidative resistance of BFPC. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44198.

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Mechanism of antioxidant interaction on polymer oxidation by thermal and radiation ageing

Cited by 54 publications

References 3 publications

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

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

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Improving thermo‐oxidative degradation resistance of bamboo fiber reinforced polypropylene composite with antioxidants. Part I: Screening of antioxidants

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