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<p>Thermoplastic polyolefin (TPO) has been widely used in waterproofing, photovoltaic, and other fields because of combining the advantages of traditional plastics and rubbers. However, the properties of TPO was sensitive to the potential presence of heat, humid, and ultraviolet (UV) irradiation during the process of production and application. Therefore, this work aimed to investigate the chemical and physical change of appearance, thermal behavior, infrared absorption characteristic, and tensile strength for original and recycled TPO to understand and evaluate their ageing process. The properties of TPOs undergoing 1, 3, 5, and 10 times of processing cycles were examined before and after an coupled ageing treatment of UV irradiation, high temperature, and high humidity. The result shows that reprocessing has rarely influence on the initial melting point and tensile strength but accelerates the degradation process. The carbonyl index (CI) is applied to be an indicator of the using strategy by gaining the link between the chemical structure, thermal stability, and tensile stress with their ageing extent under simulated environment. The CI values of &lt; 0.2, 0.2-0.3, and &gt; 0.3 are recognized as critical values for TPOs to be further using, need repair, and performance failure. This study clarifies the relationship of the chemical structure change with the physical properties of TPOs and provides a strategy of evaluating the performance of using materials, which may help prolong the lifetime of the TPO components through repair in time.</p>

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Degradation Behavior of Original and Recycled Thermoplastic Polyolefin (TPO) After Ultraviolet (UV) Ageing

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Yingnan Song,
  • Bing Ge,
  • Xuejun Bian,
  • Li Li,
  • Wenjun Fu,
  • Jiaqi Wang,
  • Yingying Cao,
  • Jingxian Wang

摘要

Thermoplastic polyolefin (TPO) has been widely used in waterproofing, photovoltaic, and other fields because of combining the advantages of traditional plastics and rubbers. However, the properties of TPO was sensitive to the potential presence of heat, humid, and ultraviolet (UV) irradiation during the process of production and application. Therefore, this work aimed to investigate the chemical and physical change of appearance, thermal behavior, infrared absorption characteristic, and tensile strength for original and recycled TPO to understand and evaluate their ageing process. The properties of TPOs undergoing 1, 3, 5, and 10 times of processing cycles were examined before and after an coupled ageing treatment of UV irradiation, high temperature, and high humidity. The result shows that reprocessing has rarely influence on the initial melting point and tensile strength but accelerates the degradation process. The carbonyl index (CI) is applied to be an indicator of the using strategy by gaining the link between the chemical structure, thermal stability, and tensile stress with their ageing extent under simulated environment. The CI values of < 0.2, 0.2-0.3, and > 0.3 are recognized as critical values for TPOs to be further using, need repair, and performance failure. This study clarifies the relationship of the chemical structure change with the physical properties of TPOs and provides a strategy of evaluating the performance of using materials, which may help prolong the lifetime of the TPO components through repair in time.