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<p>Reuse/recycling of expensive components in next-generation optoelectronic systems (e.g., flexible electronics and foldable displays) for sustainability purposes impose stringent requirements on optically clear adhesive (OCA) with on-demand adhesion/deadhesion capability. Although some hot-melt OCAs have been developed, there still remain great challenges in balancing the mechanical property, adhesion/detachment and recyclability/reusability of the OCAs. Herein, we developed a debondable and robust polyurethane (PU)-based optically clear adhesive with both mechanical and chemical recyclability, overcoming the critical bottlenecks in sustainable advanced manufacturing. The ductile yet strong PU-based OCAs not only can adhere to various optically transparent glass and polymeric substrates (with a bonding strength high up to 5.0 MPa), but also exhibit deadhesion capability at high temperature owing to the thermally sensitive H-bonding interaction within the polymer network. The on-demand adhesion/deadhesion facilitates non-destructive detachment of functional assemblies and materials recycling/repair. The mechanical and chemical recyclability of PU-based OCAs can also effectively reduce the cost and address the end-of-life issues. Moreover, the PU-based OCAs outperformed some commercial optical adhesives. In view of the straightforward synthesis, easy industrial scale-up and exceptional comprehensive properties, the PU-based OCAs will provide promising transformative solutions for advancing the circular economy and sustainability in next-generation optoelectronic devices.</p>

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Mechanically and chemically recyclable polyurethane-based optically clear adhesive with on-demand adhesion/deadhesion

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Xiaoyu Zhang,
  • Mingqian Wang,
  • Huan Yang,
  • Zhiqiang Ding,
  • Yuesheng Li,
  • Bin Wang

摘要

Reuse/recycling of expensive components in next-generation optoelectronic systems (e.g., flexible electronics and foldable displays) for sustainability purposes impose stringent requirements on optically clear adhesive (OCA) with on-demand adhesion/deadhesion capability. Although some hot-melt OCAs have been developed, there still remain great challenges in balancing the mechanical property, adhesion/detachment and recyclability/reusability of the OCAs. Herein, we developed a debondable and robust polyurethane (PU)-based optically clear adhesive with both mechanical and chemical recyclability, overcoming the critical bottlenecks in sustainable advanced manufacturing. The ductile yet strong PU-based OCAs not only can adhere to various optically transparent glass and polymeric substrates (with a bonding strength high up to 5.0 MPa), but also exhibit deadhesion capability at high temperature owing to the thermally sensitive H-bonding interaction within the polymer network. The on-demand adhesion/deadhesion facilitates non-destructive detachment of functional assemblies and materials recycling/repair. The mechanical and chemical recyclability of PU-based OCAs can also effectively reduce the cost and address the end-of-life issues. Moreover, the PU-based OCAs outperformed some commercial optical adhesives. In view of the straightforward synthesis, easy industrial scale-up and exceptional comprehensive properties, the PU-based OCAs will provide promising transformative solutions for advancing the circular economy and sustainability in next-generation optoelectronic devices.