Chan Edwin P, Karp Jeffrey M, Langer Robert S
Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.
J Polym Sci B Polym Phys. 2011 Jan 1;49(1):40-44. doi: 10.1002/polb.22165.
Surface wrinkles are interesting since they form spontaneously into well-defined patterns. The mechanism of formation is well-studied and is associated with the development of a critical compressive stress that induces the elastic instability. In this work, we demonstrate surface wrinkles that dynamically change in response to a stimulus can improve interfacial adhesion with a hydrogel surface through the dynamic evolution of the wrinkle morphology. We observe that this control is related to the local pinning of the crack separation pathway facilitated by the surface wrinkles during debonding, which is dependent on the contact time with the hydrogel.
表面皱纹很有趣，因为它们会自发形成清晰的图案。其形成机制已得到充分研究，且与引发弹性失稳的临界压缩应力的发展有关。在这项工作中，我们证明了响应刺激而动态变化的表面皱纹可以通过皱纹形态的动态演变来改善与水凝胶表面的界面粘附力。我们观察到这种控制与脱粘过程中表面皱纹促进的裂纹分离路径的局部钉扎有关，这取决于与水凝胶的接触时间。
