Park Youngjoo, Lim Sumin, Kwon Min Sang
Department of Material Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea.
Adv Mater. 2025 Jul;37(30):e2420538. doi: 10.1002/adma.202420538. Epub 2025 May 12.
In advanced applications such as flexible displays, reusing components is essential for achieving sustainability. However, the removal of acrylic pressure-sensitive adhesives (PSAs), which bond these components, remains a major challenge due to residue formation and the non-degradable C─C backbone. Here, the development of new acrylic PSA alternatives for foldable displays is reported by introducing ultraviolet (UV)-triggered debondability, degradability through lipoic acid analogs, and a visible-light-curing process. PSAs composed of 60 mol% lipoic acid ethyl ester (LpEt) and 3 mol% UV-cross-linkable benzophenone-functionalized acrylic monomers exhibit viscoelastic properties comparable to those of conventional acrylic PSAs, while also enable clean removal from substrates after use. Following removal, the PSAs efficiently degrade into small molecular units in the presence of a green reductant or can be recovered as monomers under controlled conditions. This strategy offers a promising pathway toward sustainable PSAs, enables the recycling of valuable substrates from flexible display modules while simultaneously allows adhesive recovery, thus presents a viable alternative to conventional acrylic adhesives.
在诸如柔性显示器等先进应用中，重复使用组件对于实现可持续性至关重要。然而，由于残留形成和不可降解的碳 - 碳主链，去除用于粘结这些组件的丙烯酸类压敏胶粘剂（PSA）仍然是一个重大挑战。在此，通过引入紫外线（UV）触发的可脱粘性、通过硫辛酸类似物实现的可降解性以及可见光固化工艺，报道了用于可折叠显示器的新型丙烯酸类PSA替代品的开发。由60摩尔％硫辛酸乙酯（LpEt）和3摩尔％可UV交联的二苯甲酮官能化丙烯酸单体组成的PSA表现出与传统丙烯酸类PSA相当的粘弹性，同时在使用后也能够从基材上干净地去除。去除后，PSA在绿色还原剂存在下可有效降解为小分子单元，或者在受控条件下可作为单体回收。该策略为可持续PSA提供了一条有前景的途径，能够从柔性显示模块中回收有价值的基材，同时允许胶粘剂回收，从而为传统丙烯酸类胶粘剂提供了一种可行的替代方案。
