Jarach Natanel, Cohen Michal, Gitt Rivka, Dodiuk Hanna, Kenig Samuel, Magdassi Shlomo
The Department of Polymer Materials Engineering, Pernick Faculty of Engineering, Shenkar - Engineering. Design. Art, Raman-Gan, 5252679, Israel.
Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
Adv Mater. 2025 Jul;37(30):e2502040. doi: 10.1002/adma.202502040. Epub 2025 May 16.
Adhesives are vital in industries ranging from aerospace to consumer electronics. However, their reliance on non-recyclable polymers makes them suitable for one-time use and results in significant economic and environmental challenges. Reversible adhesives, based on covalent adaptable networks, address these issues and open possibilities for applications, including recyclable multi-layer packaging, removable labels, and fully recyclable electronics - batteries, smartphones, etc. Despite progress in dynamic and reversible bonds, current solutions often compromise performance or the ability to detach from substrates. This study proposes reversible high-performance adhesives that can undergo cycles of bonding-debonding without commonly reported need to add solvent, high-temperature processing or use deep-UV irradiation while maintaining adhesives' functionality and reducing environmental impact. The bonding is done by rapid photocuring, which occurs within 30 seconds under irradiation at a wide range of visible wavelengths (400-650 nm) while achieving constant adhesion strength across diverse substrates, including underwater adhesion. De-bonding is achieved using a simple household microwave. Furthermore, the adhesive's transparency and high refractive index enable its use in various optical applications, whereas its robustness in wet conditions expands its potential for bioadaptive or underwater systems. This adhesive represents a significant step toward sustainable adhesives that seamlessly integrate high performance with circular-economy principles.
粘合剂在从航空航天到消费电子等众多行业中都至关重要。然而，它们对不可回收聚合物的依赖使其仅适用于一次性使用，并带来了重大的经济和环境挑战。基于共价自适应网络的可逆粘合剂解决了这些问题，并为包括可回收多层包装、可移除标签以及完全可回收电子产品（电池、智能手机等）在内的应用开辟了可能性。尽管在动态和可逆键方面取得了进展，但目前的解决方案往往会在性能或从基材上分离的能力方面做出妥协。本研究提出了可逆高性能粘合剂，其可以经历粘结 - 脱粘循环，而无需通常所报道的添加溶剂、高温处理或使用深紫外辐射，同时保持粘合剂的功能并减少对环境的影响。粘结通过快速光固化完成，在广泛的可见波长（400 - 650纳米）照射下，30秒内即可发生，同时在包括水下粘结在内的各种基材上实现恒定的粘附强度。脱粘使用简单的家用微波炉即可实现。此外，该粘合剂的透明度和高折射率使其可用于各种光学应用，而其在潮湿条件下的坚固性则扩大了其在生物适应性或水下系统中的潜力。这种粘合剂代表了朝着将高性能与循环经济原则无缝结合的可持续粘合剂迈出的重要一步。
