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<p>This study investigated the effects of various intermediate products formed during ultraviolet radiation (UV) aging of natural rubber on its properties through numerical simulations. The analysis of these products provides valuable insights into the mechanical performance of seismic isolation rubber bearings used in bridges and other infrastructures. Eight molecular dynamics models were developed to represent different aging products of natural rubber based on its aging mechanism. These models were used to simulate and analyze density, radius of gyration, mean square displacement, glass transition temperature, uniaxial tensile properties, and dynamic mechanical behavior. The effects of chain scission, hydroxylation, and ether crosslinking on the microstructure and mechanical performance were systematically investigated. The results revealed that oxidation products formed during UV aging significantly influenced the microstructure, glass transition temperature, and mechanical properties of the systems. Particularly, chain scission reduced the elastic modulus and increased energy dissipation.</p>

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Molecular dynamics simulation of ultraviolet aging effects on the mechanical and physical properties of natural rubber

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Xianjie Wang,
  • Qingtao Ji,
  • Dejie Hu,
  • Xinyu Jiang,
  • Rushuang Wang

摘要

This study investigated the effects of various intermediate products formed during ultraviolet radiation (UV) aging of natural rubber on its properties through numerical simulations. The analysis of these products provides valuable insights into the mechanical performance of seismic isolation rubber bearings used in bridges and other infrastructures. Eight molecular dynamics models were developed to represent different aging products of natural rubber based on its aging mechanism. These models were used to simulate and analyze density, radius of gyration, mean square displacement, glass transition temperature, uniaxial tensile properties, and dynamic mechanical behavior. The effects of chain scission, hydroxylation, and ether crosslinking on the microstructure and mechanical performance were systematically investigated. The results revealed that oxidation products formed during UV aging significantly influenced the microstructure, glass transition temperature, and mechanical properties of the systems. Particularly, chain scission reduced the elastic modulus and increased energy dissipation.