Laboratoire de Physique Statistique (LPS), UMR 8550 CNRS, ENS, Univ. Paris Diderot, Sorbonne Université, 24 rue Lhomond, 75005, Paris, France.
Laboratoire de Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR 7636 CNRS, ESPCI, Univ. Paris Diderot, Sorbonne Université, 10 rue Vauquelin, 75005 Paris, France.
Soft Matter. 2019 Jan 28;15(4):770-778. doi: 10.1039/c8sm01946k. Epub 2019 Jan 11.
The functionality of adhesives relies on their response under the application of a load. Yet, it has remained a challenge to quantitatively relate the macroscopic dynamics of peeling to the dissipative processes inside the adhesive layer. Here we investigate the peeling of a reversible adhesive made of a polymer gel, measuring the relationship between the peeling force, the peeling velocity, and the geometry of the interface at small-scale. Experiments are compared to a theory based on the linear viscoelastic response of the adhesive, augmented with an elastocapillary regularization approach. This theory, fully quantitative in the limit of small surface deformations, demonstrates the emergence of a "wetting" angle at the contact line and exhibits scaling laws for peeling which are in good agreement with the experimental results. Our findings provide a new strategy for design of reversible adhesives, by quantitatively combining wetting, geometry and dissipation.
胶粘剂的功能依赖于其在负载作用下的响应。然而，将剥离的宏观动力学与胶粘剂层内的耗散过程定量关联仍然是一个挑战。在这里，我们研究了由聚合物凝胶制成的可逆胶粘剂的剥离，在小尺度上测量了剥离力、剥离速度和界面几何形状之间的关系。实验结果与基于胶粘剂线性粘弹性响应的理论进行了比较，该理论通过弹性毛细正则化方法进行了扩充。该理论在小表面变形的极限下是完全定量的，它证明了在接触线处出现了“润湿”角，并表现出与实验结果吻合良好的剥离标度律。我们的研究结果为设计可逆胶粘剂提供了一种新策略，通过定量结合润湿、几何形状和耗散来实现。
