Duigou-Majumdar Aymeric, Cortet Pierre-Philippe, Poulard Christophe
Université Paris-Saclay, CNRS, FAST, 91405, Orsay, France.
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France.
Soft Matter. 2022 Aug 10;18(31):5857-5866. doi: 10.1039/d2sm00532h.
The debonding criterion of fibrils of soft adhesive materials is a key element regarding the quantitative modelisation of pressure sensitive adhesive tapes' peeling energy. We present in this article an experimental study of the detachment of a commercial acrylic adhesive tape from the top surface of a single micrometric pillar of PDMS elastomer. During an experiment, the pillar and the adhesive, after being put in contact, are separated at a constant displacement rate, resulting in the formation, the elongation and the final detachment of a fibril of adhesive material. A systematic study allows us to uncover power laws for the maximum force and the critical elongation of the fibril at debonding as a function of the diameter of the cylindrical pillar which controls the diameter of the fibril. The scaling law evidenced for the critical elongation appears as a first step toward the understanding of the debonding criterion of fibrils of soft adhesive materials. In addition, viscoelastic digitation at the triple debonding line is observed during detachment for large pillar diameters. The wavelength and penetration length of the fingers that we report appear to be consistent with existing models based on pure elastic mechanical response.
软质粘性材料原纤维的脱粘准则是压敏胶带剥离能定量建模的关键要素。在本文中，我们展示了一项关于商用丙烯酸胶带从单个微米级聚二甲基硅氧烷（PDMS）弹性体柱顶表面分离的实验研究。在实验过程中，柱体和粘合剂接触后，以恒定位移速率分离，导致粘性材料原纤维的形成、伸长和最终分离。一项系统性研究使我们能够揭示脱粘时原纤维的最大力和临界伸长与控制原纤维直径的圆柱形柱体直径之间的幂律关系。所证明的临界伸长的标度律似乎是迈向理解软质粘性材料原纤维脱粘准则的第一步。此外，在分离过程中，对于大直径柱体，在三重脱粘线处观察到粘弹性指状现象。我们报告的指状结构的波长和穿透长度似乎与基于纯弹性力学响应的现有模型一致。
