Hyder Matthew J, Godleman Jessica, Kyriacou Andrew, Reynolds Stuart W, Hallett James E, Zinn Thomas, Harries Josephine L, Hayes Wayne
Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K.
Domino UK Ltd, Trafalgar Way, Bar Hill, Cambridge CB23 8TU, U.K.
ACS Appl Eng Mater. 2025 Jul 17;3(8):2550-2563. doi: 10.1021/acsaenm.5c00390. eCollection 2025 Aug 22.
While strong polymeric adhesives are widely valued, their removal can present a significant challenge where substrate recycling is concerned. Recent advancements in "debond-on-demand" adhesives have shown promising enhancements in adhesive strength and debondability. However, they often face a choice between increased adhesive strength or the rate and degree of debonding. Here we report using a rapidly base degradable chain-extender within a series of polyurethanes which possess tailorable adhesive characteristics. These chain-extended polyurethanes (CEPUs) possess high shear strength (8.20 MPa) which upon exposure to base solutions depolymerise (up to 88% loss in ) facilitating up to 92% loss in shear strength after only 30 min. Formulation of the CEPUs into inks suitable for continuous inkjet (CIJ) printing produced defined images which upon treatment with base solutions could be removed from the substrate. Having been engineered for circularity, the parent CEPUs can be recycled postdegradation into daughter CEPUs, maintaining their depolymerizable and "debond-on-demand" properties. This work highlights how commercially available starting materials can be utilized to generate highly tailorable polymeric adhesives and inkjet binders capable of rapid depolymerization, ultimately providing an industrially attractive system to increase the recyclability and sustainability of waste materials.
虽然强力聚合物粘合剂具有广泛的价值，但在涉及基材回收时，去除它们可能是一项重大挑战。“按需脱粘”粘合剂的最新进展在粘合强度和脱粘性能方面显示出了有前景的提升。然而，它们常常面临在提高粘合强度与脱粘速率和程度之间进行选择的问题。在此，我们报告了在一系列具有可定制粘合特性的聚氨酯中使用一种可快速被碱降解的扩链剂。这些扩链聚氨酯（CEPU）具有高剪切强度（8.20兆帕），在暴露于碱性溶液时会发生解聚（在 中损失高达88%），仅30分钟后剪切强度损失高达92%。将CEPU配制成适用于连续喷墨（CIJ）打印的油墨可产生清晰的图像，在用碱性溶液处理后，这些图像可从基材上移除。经过循环利用设计，母体CEPU在降解后可被回收为子体CEPU，保持其可解聚和“按需脱粘”的特性。这项工作突出了如何利用市售起始材料来制备具有高度可定制性、能够快速解聚的聚合物粘合剂和喷墨粘合剂，最终提供一个在工业上具有吸引力的系统，以提高废料的可回收性和可持续性。
