Fabrication of micro-scale wrinkles on a curved surface using weak-polymerization and surface shrinkage

We proposed a new process to fabricate micro-scale polymer wrinkles on a curved surface. A UV-curable resin layer on a substrate is weakly polymerized by a small dose of UV-light. By the exposure, there is a curing gradient through the thickness in the resin layer; fully-polymerized zone on the surf...

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Bibliographic Details
Published inInternational journal of precision engineering and manufacturing Vol. 15; no. 11; pp. 2469 - 2471
Main Authors Park, Hee-Jin, Son, Changmin, Park, Sang-Hu
Format Journal Article
LanguageEnglish
Published Springer Korean Society for Precision Engineering 01.11.2014
Subjects
Engineering
Industrial and Production Engineering
Materials Science
Short Communication
Surface wrinkles
Weak-polymerization
NOA-68T
Wrinkles on a curved surface
Thermal curing
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Summary:We proposed a new process to fabricate micro-scale polymer wrinkles on a curved surface. A UV-curable resin layer on a substrate is weakly polymerized by a small dose of UV-light. By the exposure, there is a curing gradient through the thickness in the resin layer; fully-polymerized zone on the surface and sol-gel inside. Then, it is cured completely under temperature of 28°C. According to the different states between surface and inside of the layer, a compressive force is generated on the surface zone during a fully-curing process. Through this work, regular surface wrinkles are generated on the surface with a width of around 20 μm. To reduce the total processing time, an approach of thermal curing after weak-polymerization is proposed. We believed that the proposed method can be applied to make wrinkles on arbitrary-shaped surface for applications to diverse research fields such as heat transfer and catalyst enhancement.
ISSN:2234-7593
2005-4602
DOI:10.1007/s12541-014-0616-2