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

Yu, Dan; Hensel, René; Beckelmann, Dirk; Opsölder, Michael; Schäfer, Bruno; Moh, Karsten; Oliveira, Peter William de; Arzt, Eduard

doi:10.1007/s10853-019-03735-x

Cited by 8 publications

(5 citation statements)

References 48 publications

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“…The majority of the UV-R2R systems have utilized high UV intensities (over 1 W cm −2 ) for fast and complete curing of printed structures. [14,17,[44][45][46] With such high UV intensities, every polymer resin could be cured within seconds neglecting the oxygen inhibition issue. [27] However, as we have shown above, high UV intensity has many negative effects on the flexible mold lifetime.…”

Section: Discussionmentioning

confidence: 99%

“…This achievement has not been reported in the previous R2R studies with flexible molds to our knowledge, except one study with an aluminum-based rigid mold. [22] There have been several studies that focused on the durability of the printed products, not the molds, [14,17,38,39] even though the mold lifetime is one of the most important issues in the R2R manufacturing industry. Also, a few studies demonstrated hundreds of cycles of lifetime with metal-based rigid molds and non-sticky printed materials.…”

Section: Mold Repeatability and R2r-printed Microstructure Adhesion P...mentioning

confidence: 99%

“…Although the adhesive strengths were tested against rough surfaces, they were higher or comparable to the strengths measured against smooth glass surfaces using the adhesives fabricated from R2R manufacturing systems in previous studies. [14,16,17] When the PUA adhesive was tested against a smooth glass surface, the adhesive was able to lift up an object of ≈3.36 kg (≈130 kPa). This strength is one of the top adhesive strength values amongst the values reported in previous dry adhesive studies.…”

Section: Mold Repeatability and R2r-printed Microstructure Adhesion P...mentioning

confidence: 99%

“…[9][10][11][12][13] Roll-to-roll (R2R)-manufacturing-based replication of complex 3D adhesive microstructures (i.e., gecko-inspired adhesives) has been proven to be a scalable, continuous, and cost-effective manufacturing technique toward their commercialization. [14][15][16][17][18][19][20] UV-light-curable polyurethane acrylates (PUAs) have been mainly used as the structural material because they can be cured fast with superior and tunable mechanical properties. However, there have been limitations in UV-curingbased R2R (UV-R2R) manufacturing of the complex 3D adhesive microstructures.…”

mentioning

confidence: 99%

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Enhanced Flexible Mold Lifetime for Roll‐to‐Roll Scaled‐Up Manufacturing of Adhesive Complex Microstructures

Kim

Krishna-Subbaiah

et al. 2022

Advanced Materials

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Various functional complex 3D patterned surfaces with micro‐ or nanostructures have been developed and their superior performances over non‐patterned smooth surfaces proven. However, it is challenging to mass‐produce such complex micro‐/nanopatterned surfaces, which limits their commercialization drastically. Although roll‐to‐roll (R2R) manufacturing using flexible molds has been implemented for mass‐production of such functional surfaces, the poor mold repeatability issue has not been resolved yet. Here, a strategy to significantly improve the repeatability of the micropatterned flexible silicone molds over 1000 cycles against highly adhesive polyurethane acrylates (PUAs) in UV light curing based R2R systems by using a two‐step curing process is reported. The mold repeatability is drastically increased from 10s of cycles to over 1000 cycles through the proposed strategy in spite of the complicated 3D undercut geometry and high tackiness of the microstructure. This two‐step process would enable scaled‐up production of micro‐/nanostructured adhesives, such as gecko‐inspired microfiber adhesives as demonstrated in this study, as well as various other functional micro‐/nanostructured surfaces by enhancing the flexible mold lifetime.

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Section: Discussionmentioning

confidence: 99%

Section: Mold Repeatability and R2r-printed Microstructure Adhesion P...mentioning

confidence: 99%

Section: Mold Repeatability and R2r-printed Microstructure Adhesion P...mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Flexible Mold Lifetime for Roll‐to‐Roll Scaled‐Up Manufacturing of Adhesive Complex Microstructures

Kim

Krishna-Subbaiah

et al. 2022

Advanced Materials

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“…The reasons for this are as follows. On the one hand, conventional elastomer-based adhesives are usually made from multicomponent materials, such as silicone elastomers, – UV-curing polymers, – and shape memory polymers (rubbery state). , Although such elastomer-based adhesives can exhibit excellent adhesion properties as long as they are in gentle contact with the targets, i.e., high adhesion at low contacting preload, the mechanical properties of these elastomers can vary drastically with temperature, , which exhibit decreasing fatigue durability, fracture resistance, and adhesion performance with increasing temperature due to low intermolecular bonding energy and possibly insufficient evaporation and reaction of curing agents or other additives. Therefore, the application of elastomer-based adhesives at high temperatures has the potential to lose adhesion performance and leave contamination on the surfaces of targets after manipulation.…”

Section: Introductionmentioning

confidence: 99%

Micropatterned Fluororubber-Based Dry Adhesive for Pan-Semiconductor Production Line with Complicated Operating Conditions

Li,

Tian,

Fan

et al. 2023

Langmuir

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The efficient and safe manipulation of precision materials (such as thin and fragile wafers and glass substrates for flat panel displays) under complicated operating conditions with vacuum, high temperature, and low preload stress is an essential task for pan-semiconductor production lines. However, current manipulation approaches such as suction-based gripping (invalid under vacuum conditions) and mechanical clamping (stress concentration at the contact interfaces) are challenged to satisfy such complex requirements. Herein, fluororubber (FKM) is employed as an adhesive material to overcome such challenges due to its outstanding thermostability, availability under vacuum environments, and high adhesion at low contacting preloads. However, the adhesion of the FKM film decreases significantly with increasing temperature (decrease by 84.83% at 245 °C). Consequently, a micropatterned FKM-based dry adhesive (MFA) fabricated by laser etching is developed. The experimental results reveal that MFAs are efficient in restraining adhesion attenuation at high temperatures (minimum 15% decrease at 245 °C). The numerical analysis and in situ observations reveal the mechanism of the MFAs in restraining adhesion attenuation. The contamination-free and high adhesion at low contacting preload of MFAs can be of great interest in pan-semiconductor production lines that require complicated operating conditions on temperature, vacuum, and interface stress.

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Bioinspired Nanocomposite Dry Adhesives Applicable Over a Wide Temperature Range

Li,

Tian

et al. 2024

Adv Funct Materials

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Bioinspired structural adhesives have shown great potential in the field of industrial manipulation and locomotion. However, such adhesives usually perform great adhesion performance at room temperature, reliable adhesion under high‐temperature conditions remains a major challenge and is rarely investigated, which severely limits the applications of current bioinspired adhesives. Here, a bioinspired adhesive structure based on fluororubber (FKM) and nanofillers is proposed. The adhesive structure has a “suction cup‐shaped” tip that mimics the special structural configuration of the adhesive setae of Dytiscus lapponicus, and the ability to regulate the structural modulus by adjusting the content of nanofillers, as well as exhibiting strong and contamination‐free adhesion (>350 kPa) with high adhesive efficiency (up to 77.7) in a wide temperature range (from room temperature to high temperatures (>200 °C)). Moreover, the adhesion performance can be enhanced by precisely regulating the structural modulus, and the enhancement mechanism is demonstrated based on the cohesive zone theory. The proposed adhesion strategy expands the application areas of dry adhesives from room‐ to high‐temperature conditions, especially for the pick‐up and transfer of thin and fragile materials that require high‐temperature operation, opening an avenue for the development of devices and systems based on dry adhesives.

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

Cited by 8 publications

References 48 publications

Enhanced Flexible Mold Lifetime for Roll‐to‐Roll Scaled‐Up Manufacturing of Adhesive Complex Microstructures

Enhanced Flexible Mold Lifetime for Roll‐to‐Roll Scaled‐Up Manufacturing of Adhesive Complex Microstructures

Micropatterned Fluororubber-Based Dry Adhesive for Pan-Semiconductor Production Line with Complicated Operating Conditions

Bioinspired Nanocomposite Dry Adhesives Applicable Over a Wide Temperature Range

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