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<p>The application of poly(butylene adipate-<i>co</i>-terephthalate) (PBAT) biodegradable plastics has long been constrained by insufficient light aging resistance. Hindered amine light stabilizers (HALSs), known as eco-friendly additives, can scavenge free radicals to enhance polymer durability. However, rough choices have resulted in wastage of resources and environmental pressure. Based on the application of plastic films as the background for use, this study systematically evaluates application effects of five HALSs. The films underwent accelerated aging for various durations and were further investigated by a combination of experiments and molecular simulation. Results showed that all HALSs mitigated PBAT light aging, with Chimassorb-944 (UV-944) and Tinuvin-770 (UV-770) performing the best for real applications. Quantum chemical calculation results showed that UV-944 had stronger anti migration ability. After 300 h of aging, films with UV-944 and UV-770 retained superior tensile strength and elongation at break in the transverse direction compared to neat PBAT films. Polymeric HALSs provided better long-term stability than small-molecule ones. Further spectra analysis indicated that stronger C—O bonds in HALS/PBAT composites correlated with improved photostability. This study offers valuable insights into improving weather resistance of PBAT biodegradable films and optimizing the real application of HALSs.</p>

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Photostabilization of Poly(butylene adipate-co-terephthalate) (PBAT) Films with Hindered Amine Light Stabilizers: Performance Evaluation and Mechanistic Insights

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Yang Wang,
  • Wen-Qing He,
  • Su-Nan Tian,
  • Yue Wang,
  • Run-Hao Bai,
  • Aurore Richel,
  • Qiu-Yun Liu,
  • Jia-Lei Liu,
  • Cai-Bin Li,
  • He-Qing Cai,
  • Zhi-Chao Zhen,
  • Qi Liu

摘要

The application of poly(butylene adipate-co-terephthalate) (PBAT) biodegradable plastics has long been constrained by insufficient light aging resistance. Hindered amine light stabilizers (HALSs), known as eco-friendly additives, can scavenge free radicals to enhance polymer durability. However, rough choices have resulted in wastage of resources and environmental pressure. Based on the application of plastic films as the background for use, this study systematically evaluates application effects of five HALSs. The films underwent accelerated aging for various durations and were further investigated by a combination of experiments and molecular simulation. Results showed that all HALSs mitigated PBAT light aging, with Chimassorb-944 (UV-944) and Tinuvin-770 (UV-770) performing the best for real applications. Quantum chemical calculation results showed that UV-944 had stronger anti migration ability. After 300 h of aging, films with UV-944 and UV-770 retained superior tensile strength and elongation at break in the transverse direction compared to neat PBAT films. Polymeric HALSs provided better long-term stability than small-molecule ones. Further spectra analysis indicated that stronger C—O bonds in HALS/PBAT composites correlated with improved photostability. This study offers valuable insights into improving weather resistance of PBAT biodegradable films and optimizing the real application of HALSs.