Stamp Claas-Hendrik, Stumpp Jana, Calvino Céline
Cluster of Excellence livMatS, Albert Ludwig University of Freiburg (livMatS), FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies, Georges-Köhler-Allee 105, D-79110, Freiburg, Germany.
Albert Ludwig University of Freiburg, Department of Microsystems Engineering (IMTEK), Georges-Köhler-Allee 102, D-79110, Freiburg, Germany.
Adv Mater. 2025 Apr;37(13):e2414308. doi: 10.1002/adma.202414308. Epub 2025 Mar 3.
Temporary adhesives capable of forming strong yet easily reversible bonds are garnering significant interest as sustainable materials that facilitate the recycling and recovery of high-value components. Herein is presented a comprehensive design and parameterization framework for developing effective temporary adhesives with mechanically induced debonding-on-demand capabilities. This framework is achieved by incorporating hexyl acetate-filled microcapsules into commercial polyvinyl acetate adhesives, creating a responsive adhesive composite. Under controlled compression, these microcapsules rupture precisely, releasing their contents to induce sufficient adhesive plasticization to enable effortless debonding. Our results indicate that while the inclusion of microcapsules affects adhesion strength and toughness, the overall mechanical performance remains stable across different concentrations. Thermal tests highlight a 50 wt.% microcapsule concentration as optimal for enhanced plasticization, while compression tests show that an applied force of 5 kN achieves maximum capsule rupture without compromising substrate integrity. Ultimately, specimens bonded with the responsive composite under compression exhibit a striking 1200% increase in creep rates compared to those bonded with the neat adhesive, allowing for effective debonding-on-demand-an outcome unattainable with the neat adhesive. This simple and highly versatile approach lays the groundwork for advancing the development of more sustainable and functional adhesive materials.
能够形成牢固但易于可逆粘合的临时粘合剂作为促进高价值组件回收利用的可持续材料，正引起人们的极大兴趣。本文提出了一个全面的设计和参数化框架，用于开发具有机械诱导按需脱粘能力的有效临时粘合剂。该框架是通过将填充乙酸己酯的微胶囊掺入商用聚醋酸乙烯酯粘合剂中实现的，从而形成一种响应性粘合剂复合材料。在受控压缩下，这些微胶囊精确破裂，释放其内含物以诱导足够的粘合剂增塑，从而实现轻松脱粘。我们的结果表明，虽然微胶囊的加入会影响粘合强度和韧性，但在不同浓度下整体机械性能保持稳定。热测试表明，50 wt.%的微胶囊浓度最适合增强增塑效果，而压缩测试表明，施加5 kN的力可实现最大程度的胶囊破裂，同时不会损害基材的完整性。最终，与纯粘合剂粘合的试样相比，在压缩下与响应性复合材料粘合的试样蠕变速率显著提高了1200%，从而实现了有效的按需脱粘——这是纯粘合剂无法实现的结果。这种简单且用途广泛的方法为推进更可持续和功能性粘合剂材料的开发奠定了基础。
