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Tailored polyurethane acrylate blend for large-scale and high-performance micropatterned dry adhesives

  • Continuous roll-to-roll fabrication is essential for transferring the idea of bio-inspired, fibrillar dry adhesives into large-scale, synthetic, high-performance adhesive tapes. Toward this aim, we investigated process parameters that allow us to control the morphology and the resulting adhesion of mushroom-shaped micropatterned surfaces. Flexible silicone templates enabled the replication process of the polyurethane acrylate pre-polymer involving UV-light-induced cross-linking. For this paper, we particularly tailored the polyurethane acrylate pre-polymer by adding chemical components to tune UV curing kinetics and to reduce oxygen inhibition of radicals. We found that higher intensities of the UV light and faster reaction kinetics improved the quality of the microstructures, i.e., a larger cap diameter of the mushroom tips was achieved. The polymer blend U6E4 exhibited the fastest curing kinetics, which resulted in a micromorphology similar to that of the Ni-shim master structures. Best adhesion results were obtained for adhesive tapes made from U6E4 with 116 kPa pull-off stress, 1.4 N cm−1 peel strength and 71 kPa shear strength. In addition, repeated attachment–detachment tests over 100,000 cycles demonstrated strong robustness and reusability.

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Document Type:Article
Author:Dan Yu, René HenselORCiD, Dirk Beckelmann, Michael Opsölder, Bruno Schäfer, Karsten MohORCiD, Peter William de OliveiraORCiD, Eduard ArztORCiD
Parent Title (English):Journal of Materials Science
First Page:12925
Last Page:12937
Year of first Publication:2019
Release Date:2022/11/18
Impact:03.553 (2019)
Funding Information:European Research Council (ERC) under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Advanced Grant Agreement no. 340929; Leibniz-Competition Grant no. 493
Scientific Units:Functional Microstructures
Optical Materials
Open Access:Open Access
Signature:INM 2019/083
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International