Adhesive Mechanism of Polymer Patches with Densely Populated Convex and Concave Micropatterns in Dry and Wet Environments

Abstract

Fabricating polymer patches with highly adhesive properties through physical bonding methods offers the advantage of facile mass production, while avoiding the complexities and potential toxicity associated with chemical reactions and reagents. The adhesive performance of physically bonded polymer patches is intricately linked to their microstructural features. However, a significant knowledge gap persists regarding the influence of microstructures on the adhesive strength. Designing and controlling microstructures to achieve highly adhesive strength, particularly in wet environments, remains a critical challenge. In this study, we designed two simple yet representative micropattern patches utilizing van der Waals force and suction effect. The adhesion behavior was systematically analyzed in dry and wet environments by considering key structural dimensions and external stress. We explored the underlying adhesion mechanisms, developed a theoretical model to calculate the interfacial adhesion strength, and compared the performance of different microstructures in wet environments. These findings provided insights into optimizing interfacial adhesion, offering theoretical and empirical guidance for developing advanced adhesive patches with potential clinical applications.