Kortekaas Luuk, Simke Julian, Kurka Dustin W, Ravoo Bart Jan
Center for Soft Nanoscience and Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Busso-Peus-Straße 10, 48149 Münster, Germany.
ACS Appl Mater Interfaces. 2020 Jul 15;12(28):32054-32060. doi: 10.1021/acsami.0c03767. Epub 2020 Jul 2.
Adhesion is one of the most ubiquitous practical applications at surfaces. With today's society calling increasingly for more reusable and "green" alternatives, the demand for readily reversible adhesives has triggered many studies into this field, in particular by incorporating molecular photoswitches into composite materials. Responsive polymers can act as reversible adhesives, but their employment brings about synthetic drawbacks and challenges in reproducibility and reusability. Here, our results demonstrate that even a low molecular weight photoswitch can serve as an on-demand adhesive when the intermolecular interactions are sufficiently strong. We show that readily accessible arylazoisoxazoles display a fast photoreversible solid-to-liquid phase transition and perform as excellent photoreversible adhesives, with a remarkable durability over 10 immediate reuse cycles without a loss in adhesive strength or an increase in the unprecedented response time. Furthermore, the versatility of photoreversible adhesion is shown at various surfaces ranging from polymeric materials to metals, demonstrating a wide field of potential application.
粘附是表面上最普遍存在的实际应用之一。随着当今社会越来越多地呼吁使用更多可重复使用和“绿色”的替代品，对易于可逆的粘合剂的需求引发了该领域的许多研究，特别是通过将分子光开关纳入复合材料中。响应性聚合物可以用作可逆粘合剂，但其应用带来了合成方面的缺点以及可重复性和可再利用性方面的挑战。在这里，我们的结果表明，当分子间相互作用足够强时，即使是低分子量的光开关也可以用作按需粘合剂。我们表明，易于获得的芳基偶氮异恶唑显示出快速的光致可逆固-液相转变，并作为优异的光致可逆粘合剂发挥作用，在超过10个即时重复使用循环中具有显著的耐久性，而不会损失粘合强度或增加前所未有的响应时间。此外，光致可逆粘附的多功能性在从聚合物材料到金属的各种表面上都得到了展示，显示出广阔的潜在应用领域。
