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<p>This study proposes a strategy to overcome the intrinsic trade-off between mechanical robustness, flexibility, and self-healing in protective coatings for flexible displays by designing a UV-curable ladder-like polysilsesquioxane (LPSQ) hybrid network. The system utilizes a rigid inorganic Si–O–Si ladder backbone to ensure high surface hardness, while incorporating dynamic disulfide bonds and structure-directing alkyl chains to introduce the local segmental mobility and free volume (<i>V</i><sub>f</sub>) necessary for healing. The optimized coating (OF-TSH-8) exhibited excellent optical clarity (transmittance &gt; 90%, haze &lt; 1%) and a high pencil hardness of 3H. Mechanically, it demonstrated exceptional flexibility, withstanding repeated bending tests (<i>r</i> = 3&#xa0;mm) without fracture. Under UV irradiation, the coating achieved a physical depth recovery of 65% and significant crack width closure, effectively suppressing optical scattering. Additionally, fluorinated silanes provided a hydrophobic surface with a water contact angle of 104°. These results demonstrate that the structurally engineered LPSQ network provides a robust solution for next-generation flexible electronics by balancing high hardness, flexibility, and effective optical self-healing.</p> Graphical Abstract <p></p>

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Hard and flexible UV-curable self-healing ladder-like polysilsesquioxane coatings for optically clear flexible displays

  • 期刊论文

  • 发表日期：

    2026年3月14日

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  • Seung Hwan Baek,
  • Young-Hun Kim,
  • Jeong Ju Baek,
  • Ki Cheol Chang,
  • Kyung Ho Choi,
  • Jeong Ho Cho,
  • Gyojic Shin

摘要

This study proposes a strategy to overcome the intrinsic trade-off between mechanical robustness, flexibility, and self-healing in protective coatings for flexible displays by designing a UV-curable ladder-like polysilsesquioxane (LPSQ) hybrid network. The system utilizes a rigid inorganic Si–O–Si ladder backbone to ensure high surface hardness, while incorporating dynamic disulfide bonds and structure-directing alkyl chains to introduce the local segmental mobility and free volume (Vf) necessary for healing. The optimized coating (OF-TSH-8) exhibited excellent optical clarity (transmittance > 90%, haze < 1%) and a high pencil hardness of 3H. Mechanically, it demonstrated exceptional flexibility, withstanding repeated bending tests (r = 3 mm) without fracture. Under UV irradiation, the coating achieved a physical depth recovery of 65% and significant crack width closure, effectively suppressing optical scattering. Additionally, fluorinated silanes provided a hydrophobic surface with a water contact angle of 104°. These results demonstrate that the structurally engineered LPSQ network provides a robust solution for next-generation flexible electronics by balancing high hardness, flexibility, and effective optical self-healing.

Graphical Abstract