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Adhesion and relaxation of a soft elastomer on surfaces with skin like roughness

  • For designing new skin adhesives, the complex mechanical interaction of soft elastomers with surfaces of various roughnesses needs to be better understood. We systematically studied the effects of a wide set of roughness characteristics, film thickness, hold time and material relaxation on the adhesive behaviour of the silicone elastomer SSA 7–9800 (Dow Corning). As model surfaces, we used epoxy replicas obtained from substrates with roughness ranging from very smooth to skin-like. Our results demonstrate that films of thin and intermediate thickness (60 and 160 µm) adhered best to a sub-micron rough surface, with a pull-off stress of about 50 kPa. Significant variations in pull-off stress and detachment mechanism with roughness and hold time were found. In contrast, 320 µm thick films adhered with lower pull-off stress of about 17 kPa, but were less sensitive to roughness and hold time. It is demonstrated that the adhesion performance of the silicone films to rough surfaces can be tuned by tailoring the film thickness and contact time.

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Document Type:Article
Author:Sarah FischerORCiD, Silviya Boyadzhieva, René HenselORCiD, Klaus Kruttwig, Eduard ArztORCiD
Parent Title (English):Journal of the Mechanical Behavior of Biomedical Materials
First Page:303
Last Page:310
Year of first Publication:2018
Release Date:2022/11/18
Impact:03.485 (2018)
Funding Information:European Research Council (FP/2007–2013; 340929).
Groups:Funktionelle Mikrostrukturen
Open Access:Open Access
Signature:INM 2018/025
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International