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<p>In this work, a bio-based multifunctional composite film was fabricated by reinforcing a tung oil–natural rubber (N-TO) matrix with nano-ZnO via Diels-Alder modification and ultrasonic dispersion. The NR segments suppressed excessive crosslinking of tung oil, yielding a flexible semi-interpenetrating network, while well-dispersed ZnO nanoparticles enhanced thermal, photo-oxidative, and antibacterial performance. Compared with N-TO films, the ZnO-N-TO composite showed a significant increase in the initial decomposition temperature from 151.5 ℃ to 183.4 ℃ and in the residual carbon yield at 800 ℃ from 8.0% to 18.2%. Under UV irradiation, the color difference decreased from 9.6 to 3.1, reflecting more than 67% improvement in photo-stability. Antibacterial tests revealed clear inhibition zones of 6&#xa0;mm against E. coli and 8&#xa0;mm against S. aureus, whereas N-TO showed almost no activity. This work demonstrates a scalable and green approach to designing bio-based polymer films with integrated durability and antibacterial functionality, suitable for eco-friendly coatings and packaging applications.</p>

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Nano-ZnO reinforced Tung oil-natural rubber composite films with enhanced thermal stability, aging resistance and antibacterial properties

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Wei Zhang,
  • Haodan Li,
  • Yuhang Li,
  • Feng Hu,
  • Qing Cheng,
  • Youwei Liao,
  • Yan Yang

摘要

In this work, a bio-based multifunctional composite film was fabricated by reinforcing a tung oil–natural rubber (N-TO) matrix with nano-ZnO via Diels-Alder modification and ultrasonic dispersion. The NR segments suppressed excessive crosslinking of tung oil, yielding a flexible semi-interpenetrating network, while well-dispersed ZnO nanoparticles enhanced thermal, photo-oxidative, and antibacterial performance. Compared with N-TO films, the ZnO-N-TO composite showed a significant increase in the initial decomposition temperature from 151.5 ℃ to 183.4 ℃ and in the residual carbon yield at 800 ℃ from 8.0% to 18.2%. Under UV irradiation, the color difference decreased from 9.6 to 3.1, reflecting more than 67% improvement in photo-stability. Antibacterial tests revealed clear inhibition zones of 6 mm against E. coli and 8 mm against S. aureus, whereas N-TO showed almost no activity. This work demonstrates a scalable and green approach to designing bio-based polymer films with integrated durability and antibacterial functionality, suitable for eco-friendly coatings and packaging applications.