Türel Tankut, Cristadoro Anna M, Linnenbrink Martin, Tomović Željko
Polymer Performance Materials Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.
BASF Polyurethanes GmbH, Elastogranstrasse 60, 49448 Lemfoerde, Germany.
ACS Appl Mater Interfaces. 2025 Jan 8;17(1):2656-2665. doi: 10.1021/acsami.4c19435. Epub 2024 Dec 23.
Traditional adhesives often result in irreversible bonds, hindering disassembly and recycling processes. In response to the growing demand for sustainable practices, researchers have explored alternative bonding solutions. Debonding-on-demand adhesives represent a breakthrough, enabling selective weakening or breaking of adhesive bonds when desired and facilitating efficient disassembly, repair, and recycling of bonded materials. This has profound implications across industries, including packaging, footwear, automotive, and electronics, where the recycling of bonded components plays a crucial role in resource conservation. Herein, we present the incorporation of an imine-based polyol derived from vanillin and polyetheramine into a model, one-component, polyether-based polyurethane adhesives. Such systems retained their thermal performance, exhibiting onset degradation temperatures of ∼320 °C and glass transition temperatures of ∼-50 °C, similar to the reference adhesive. Additionally, they demonstrated adhesive performance comparable to that of the reference system, with lap-shear strengths ranging from 1.7 to 2.1 MPa. In addition to that, imine polyol incorporated adhesives offered enhanced recyclability through on-demand debonding of the bonded substrates to obtain adhesive-free surfaces by acidic hydrolysis of the imine functional groups. These findings undoubtedly contribute to the advancement of sustainable material practices and promote a circular economy, emphasizing the importance of adhesive technology in addressing environmental challenges.
传统粘合剂往往会形成不可逆的粘结，阻碍拆解和回收过程。为了响应可持续发展实践日益增长的需求，研究人员探索了替代粘结解决方案。按需脱粘粘合剂是一项突破，能够在需要时选择性地削弱或破坏粘结，便于对粘结材料进行高效拆解、修复和回收。这在包括包装、鞋类、汽车和电子等行业具有深远影响，其中粘结部件的回收在资源保护中起着关键作用。在此，我们展示了将源自香草醛和聚醚胺的基于亚胺的多元醇引入一种模型单组分聚醚基聚氨酯粘合剂中。此类体系保留了其热性能，起始降解温度约为320℃，玻璃化转变温度约为 -50℃，与参考粘合剂相似。此外，它们表现出与参考体系相当的粘结性能，搭接剪切强度范围为1.7至2.1MPa。除此之外，含有亚胺多元醇的粘合剂通过对粘结基材进行按需脱粘，通过亚胺官能团的酸性水解获得无粘合剂表面，从而提高了可回收性。这些发现无疑有助于推动可持续材料实践的发展，并促进循环经济，强调了粘结技术在应对环境挑战方面的重要性。
