Pressure tunable adhesion of rough elastomers,Soft Matter

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Pressure tunable adhesion of rough elastomers
Soft Matter ( IF 2.9 ) Pub Date : 2020-11-18 , DOI: 10.1039/d0sm01754j
Naomi Deneke _{1,

2,

3,

4} , Allison L. Chau _{1,

2,

3,

4} , Chelsea S. Davis _{1,

2,

3,

4}

Affiliation

The ability to control adhesion is critical in various technologies including wearable electronics, pressure sensitive adhesives, and robotic systems. Biomimetic fibrillar structures, random surface roughness, and chemical surface treatments have been employed to modify the adhesion energy of materials used in these applications. However, polymer thin film dewetting has not been investigated as a surface modification tool to control adhesion. In this work, polystyrene thin films are thermally annealed on a polydimethylsiloxane substrate, causing them to dewet and form stiff, microscopic asperities on the soft substrate. The size of the asperities increases with increasing pre-annealing film thickness. Adhesion is quantified by flat-punch normal indentation testing. The largest asperities exhibited a decrease in adhesion to below the sensitivity of the instrument. More interestingly, the surfaces covered with the smallest asperities displayed a pressure-dependent adhesive response. By increasing the normal compressive stress applied prior to separation, the total debonding energy increased monotonically on the smallest asperity-covered surfaces.

中文翻译：

粗糙弹性体的压力可调粘附力

在包括可穿戴电子设备，压敏粘合剂和机器人系统在内的各种技术中，控制粘合的能力至关重要。仿生纤维结构，随机表面粗糙度和化学表面处理已被用来改变这些应用中使用的材料的粘附能。然而，尚未研究聚合物薄膜去湿作为控制粘附的表面改性工具。在这项工作中，将聚苯乙烯薄膜在聚二甲基硅氧烷基板上进行热退火，使其变湿并在软基板上形成坚硬的微观凹凸。粗糙度的大小随着退火前膜厚度的增加而增加。通过平冲普通压痕测试来量化粘合力。最大的粗糙物表现出粘附力降低到低于仪器的灵敏度。更有趣的是，覆盖有最小凹凸的表面表现出压力依赖性的粘合响应。通过增加分离前施加的法向压缩应力，在最小的被粗糙覆盖的表面上，总的脱键能会单调增加。

更新日期：2020-11-25

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