Critical stabilizer concentrations in oxidizing polymers

Gugumus, F.

doi:10.1016/0141-3910(94)90116-3

Cited by 27 publications

(5 citation statements)

References 10 publications

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“…The addition of 0.4 wt % 1076 and DLTP combination resulted in an OIT value higher than 60 min and, therefore, an higher concentration was unnecessary. The same trend was also found in previous studies, where the percentage of antioxidants by weight commonly used by manufacturers for polymeric geomembranes was less than 0.5%, whereas it increased to more than 0.5% only recently . In this case, an antioxidant amount of 0.4 wt % is recommended based on the OIT value.…”

Section: Resultssupporting

confidence: 89%

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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Section: Resultssupporting

confidence: 89%

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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“…Frontiers in Nuclear Engineering frontiersin.org on degradation and predicts a critical AO concentration, below which the rate of degradation transits to extremely high. This critical AO concentration phenomenon has been previously observed and suggested in literature (Gugumus, 1994;Kanegami et al, 2013). Figure 1D illustrates the experimental-based analytical model developed by Hettal et al and emphasizes the thermal decomposition of ROOH, which was previously assumed to be thermally stable in both the Fuse and Gillian models.…”

Section: Figuresupporting

confidence: 73%

Review of qualification and modeling for radiation-induced polymer degradation

Chen,

Chang,

Konstanczer

et al. 2023

Front. Nucl. Eng.

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Polymeric materials have multiple potential applications in nuclear power reactors including advanced and small modulus reactors, in addition to their extensive usage in safety electronic cables in the existing light water reactors. Through the qualification programs, knowledge accumulates about the polymer degradation kinetics under gamma-irradiation environment to facilitate the development of service-life predictive models. This paper aims to promote mechanistic-based predictability as a new approach to the qualification of polymeric components. Reviewed in this article are the current qualification standards and procedures, the current understandings of the degradation mechanisms, and kinetic models applicable to accelerated experiments for qualification.

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“…Recently, experimental results have suggested that the rate of degradation becomes extremely high after the antioxidant concentration falls below a certain level [18,21]. This behavior is interpreted by the so-called critical AH concentration concept and has already been modeled in the Soviet Union [22][23][24], but has not been incorporated into a degradation scheme. AHs react with ROO • to form ROOH, but do not have a direct deactivation function, as shown in Figure 1.…”

Section: Structure Of the New Modelmentioning

confidence: 99%

Kinetic degradation model for insulating materials used on nuclear power plant safety cables

Fuse

Homma

Okamoto

2014

IEEE Trans. Dielect. Electr. Insul.

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A new degradation model for safety cables in nuclear power plants that incorporates the critical antioxidant concentration concept is proposed in order to account for the effect of antioxidants and to simulate several synergisms in various thermal and radiation environments. A chemical reaction scheme is used to represent oxidation reactions via the decomposition of peroxide radicals. The effects of antioxidants are included in this scheme in order to demonstrate critical concentration phenomena. In addition, diffusion equations are added to the reaction rate equations to enable reproduction of diffusion-limited oxidation. Such a degradation model with antioxidant effects is discussed for degradation behaviors in polymers used for safety cables under various dose rates and temperature conditions, and its effectiveness is verified.

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Critical stabilizer concentrations in oxidizing polymers

Cited by 27 publications

References 10 publications

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

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

Review of qualification and modeling for radiation-induced polymer degradation

Kinetic degradation model for insulating materials used on nuclear power plant safety cables

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