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<p>The leuco dye-based thermochromic fiber faces a significant challenge due to its poor light fastness, limiting its cyclability. Here, a hydrogen bond dissociation/structural isomerization-based dual ultraviolet (UV)-shielding strategy is proposed to develop enhanced light-resistant thermochromic elastomer fibers (Azo/TCM@Abs/TPU) employing UV absorbers and 4-dodecyloxyazobenzene (C<sub>12</sub>-Azo) through a coaxial wet-spinning process. The integration of UV absorbers and C12-Azo enhances UV protection, effectively blocking nearly the entire UV spectrum. The light fastness of Azo/TCM@Abs/TPU has been improved to Grades 3–4, enabling a stable thermochromic function to withstand several months of sunlight exposure. Additionally, the absorbed UV light is stored as chemical energy within C12-Azo via <i>trans</i>-to-<i>cis</i> photoisomerization. This stored energy can be released as heat on demand. The coaxial dual-protection concept using photoisomerization offers an efficient method to enhance light resistance in thermochromic fibers.</p>

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Azobenzene/UV absorber dual-protected thermochromic elastomeric fibers toward enhanced light-resistance

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Weidong Yu,
  • Liang Fei,
  • Jialing Tan,
  • Zinuo Zhang,
  • Chen Zhang,
  • Chaoxia Wang

摘要

The leuco dye-based thermochromic fiber faces a significant challenge due to its poor light fastness, limiting its cyclability. Here, a hydrogen bond dissociation/structural isomerization-based dual ultraviolet (UV)-shielding strategy is proposed to develop enhanced light-resistant thermochromic elastomer fibers (Azo/TCM@Abs/TPU) employing UV absorbers and 4-dodecyloxyazobenzene (C12-Azo) through a coaxial wet-spinning process. The integration of UV absorbers and C12-Azo enhances UV protection, effectively blocking nearly the entire UV spectrum. The light fastness of Azo/TCM@Abs/TPU has been improved to Grades 3–4, enabling a stable thermochromic function to withstand several months of sunlight exposure. Additionally, the absorbed UV light is stored as chemical energy within C12-Azo via trans-to-cis photoisomerization. This stored energy can be released as heat on demand. The coaxial dual-protection concept using photoisomerization offers an efficient method to enhance light resistance in thermochromic fibers.