When two stretchable materials (e.g., hydrogels, elastomers, and biological tissues) are adhered, the interface should be stretchable, without constraining the deformation and degrading adhesion. Here we develop methods to characterize stretchable adhesion. We do so by topological adhesion, using polyacrylamide hydrogels as adherends, chitosan as stitch polymers, and a change in the pH as a trigger. We prestretch the topohered hydrogels in several ways, and measure adhesion energy when the hydrogels are either in the un-stretched or the stretched state. Stretchable adhesion is achieved when the adhesion energy can maintain a similar level, insensitive to the prestretch. We study the mechanism of stretchable adhesion formed by the chitosan topohesive.

当将两种可拉伸材料（例如水凝胶，弹性体和生物组织）粘合在一起时，界面应可拉伸，而不会限制变形和降低粘合力。在这里，我们开发了表征可拉伸粘合力的方法。我们通过拓扑粘合来实现此目的，使用聚丙烯酰胺水凝胶作为被粘物，使用壳聚糖作为缝线聚合物，并通过改变pH值作为触发条件。我们以几种方式预拉伸拓扑化的水凝胶，并在水凝胶处于未拉伸或拉伸状态时测量粘附能。当粘合能对预拉伸不敏感时，粘合能保持相似的水平时，就可以实现可拉伸粘合。我们研究了壳聚糖拓扑粘合剂形成的可拉伸粘合机理。