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Mechanical Property Evolution and Mechanisms of Polyolefins Under Thermo-Oxidative Aging.

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Title: Mechanical Property Evolution and Mechanisms of Polyolefins Under Thermo-Oxidative Aging.
Authors: Li, Rui1 (AUTHOR), Xu, Yihua1,2 (AUTHOR), Li, Chao2,3 (AUTHOR), Duan, Xuewei2,4 (AUTHOR), Liu, Zhenyang1,2 (AUTHOR), Jiang, Ning1,2,3 (AUTHOR) jiangning@sdut.edu.cn, Zhang, Zhongsen3,4 (AUTHOR) zhangzhongsen@tongji.edu.cn
Source: Polymers (20734360). Feb2026, Vol. 18 Issue 4, p462. 17p.
Subjects: Polyolefins, Polymer degradation, Antioxidants, Mechanical behavior of materials, Plastic scrap, Crystallinity
Abstract: Polyolefin materials are widely used due to their excellent properties and low cost. However, in high-temperature oxygen environments, they are susceptible to thermo-oxidative aging, which reduces mechanical properties and durability. This study systematically analyzed the aging behavior and mechanisms of polyolefins at varying temperatures and exposure durations through accelerated thermal oxidation experiments. The results indicate that the thermo-oxidative aging behavior of polyolefins can be divided into three stages. In Stage I, elevated temperature promotes segmental mobility and chain rearrangement, which increases crystallinity and temporarily improves mechanical properties. In Stage II, antioxidants are progressively consumed and oxygen-containing groups begin to accumulate, resulting in reduced crystallinity, a decline in mechanical performance, and the onset of slight surface yellowing. In Stage III, the antioxidant system is largely depleted and oxidative reactions are intensified, leading to mainchain scission and molecular weight reduction. This causes a further decrease in crystallinity, a significant deterioration in both strength and toughness, accompanied by aggravated yellowing. This study elucidates the thermo-oxidative aging mechanism of polyolefins, providing a theoretical basis for assessing their service life and evaluating the stability of waste plastics. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mechanical Property Evolution and Mechanisms of Polyolefins Under Thermo-Oxidative Aging.
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Feb2026, Vol. 18 Issue 4, p462. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Polyolefins%22">Polyolefins</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+degradation%22">Polymer degradation</searchLink><br /><searchLink fieldCode="DE" term="%22Antioxidants%22">Antioxidants</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Plastic+scrap%22">Plastic scrap</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallinity%22">Crystallinity</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Polyolefin materials are widely used due to their excellent properties and low cost. However, in high-temperature oxygen environments, they are susceptible to thermo-oxidative aging, which reduces mechanical properties and durability. This study systematically analyzed the aging behavior and mechanisms of polyolefins at varying temperatures and exposure durations through accelerated thermal oxidation experiments. The results indicate that the thermo-oxidative aging behavior of polyolefins can be divided into three stages. In Stage I, elevated temperature promotes segmental mobility and chain rearrangement, which increases crystallinity and temporarily improves mechanical properties. In Stage II, antioxidants are progressively consumed and oxygen-containing groups begin to accumulate, resulting in reduced crystallinity, a decline in mechanical performance, and the onset of slight surface yellowing. In Stage III, the antioxidant system is largely depleted and oxidative reactions are intensified, leading to mainchain scission and molecular weight reduction. This causes a further decrease in crystallinity, a significant deterioration in both strength and toughness, accompanied by aggravated yellowing. This study elucidates the thermo-oxidative aging mechanism of polyolefins, providing a theoretical basis for assessing their service life and evaluating the stability of waste plastics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/polym18040462
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        Text: English
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        PageCount: 17
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        Type: general
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      – SubjectFull: Antioxidants
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      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Plastic scrap
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      – SubjectFull: Crystallinity
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      – TitleFull: Mechanical Property Evolution and Mechanisms of Polyolefins Under Thermo-Oxidative Aging.
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              Text: Feb2026
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