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Coatings 2018, 8(10), 349; https://doi.org/10.3390/coatings8100349

Continuous Tip Widening Technique for Roll-to-Roll Fabrication of Dry Adhesives

1
School of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea
2
Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, Ulsan 34130, Korea
*
Authors to whom correspondence should be addressed.
Received: 23 August 2018 / Revised: 24 September 2018 / Accepted: 28 September 2018 / Published: 30 September 2018
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Abstract

In this study, we reported continuous partial curing and tip-shaped modification methods for continuous production of dry adhesive with microscale mushroom-shaped structures. Typical fabrication methods of dry adhesive with mushroom-shaped structures are less productive due to the failure of large tips on pillar during demolding. To solve this problem, a typical pillar structure was fabricated through partial curing, and tip widening was realized through applying the proper pressure. Polyurethane acrylate was used in making the mushroom structure using two-step UV-assisted capillary force lithography (CFL). To make the mushroom structure, partial curing was performed on the micropillar, followed by tip widening. Dry adhesives with properties similar to those of typical mushroom-shaped dry adhesives were fabricated with reasonable adhesion force using the two-step UV-assisted CFL. This production technology was applied to the roll-to-roll process to improve productivity, thereby realizing continuous production without any defects. Such a technology is expected to be applied to various fields by achieving the productivity improvement of dry adhesives, which is essential for various applications. View Full-Text
Keywords: dry adhesive; biomimetics; continuous process; partial curing dry adhesive; biomimetics; continuous process; partial curing
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Lee, S.H.; Yi, H.; Park, C.W.; Jeong, H.E.; Kwak, M. Continuous Tip Widening Technique for Roll-to-Roll Fabrication of Dry Adhesives. Coatings 2018, 8, 349.

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