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Recovery Behavior of Microstructured Thiol-Ene Shape-Memory Film

Institute of Materials Science, Kaunas University of Technology, K. Baršausko 59, LT51423 Kaunas, Lithuania
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Coatings 2019, 9(4), 267; https://doi.org/10.3390/coatings9040267
Received: 14 March 2019 / Revised: 15 April 2019 / Accepted: 17 April 2019 / Published: 20 April 2019
(This article belongs to the Special Issue Advances in Flexible Films and Coatings)
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Abstract

In this work, surface microstructurization was coupled with shape-memory polymer to generate reversibly tunable surface properties. A photopolymerizable thiol-ene composition comprising a mixture of pentaerythritol tetrakis(3-mercaptopropionate) (PETMP), 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (TTT) and 2,2-dimethoxy-2-phenylacetophenone (DMPA) was used to prepare microstructured thiol-ene shape-memory film via casting and UV polymerization on the electron beam lithography fabricated arrays of 1 µm and 2 µm square pits. The mechanical deformation via compression and recovery of the surface microstructure were investigated. Results show that, after heat treatment of the deformed thiol-ene film, the recovery yields for microstructures were not worse than 90% ± 2% and 93% ± 2% for structures imprinted with 1 µm and 2 µm square pit micro imprint stamps. Additionally, heat treatment of deformed thiol-ene film resulted in the recovery of intense diffraction colors and laser diffraction patterns. This study opens up an avenue of incorporating microstructured shape-memory films for new products, e.g., optical security devices, superhydrophobic coatings, medical diagnostics and biosensors. View Full-Text
Keywords: photopolymerizable; thiol-ene network; microstructured film; mechanical deformation; recovery; shape-memory photopolymerizable; thiol-ene network; microstructured film; mechanical deformation; recovery; shape-memory
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Lazauskas, A.; Grigaliūnas, V.; Jucius, D. Recovery Behavior of Microstructured Thiol-Ene Shape-Memory Film. Coatings 2019, 9, 267.

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