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.
Highlights
Shape-memory polymers (SMPs) belong to the class of smart materials
Microstructured pentaerythritol tetrakis(3-mercaptopropionate) (PETMP)-TTT films were fabricated via casting and UV polymerization on electron beam lithography-fabricated arrays of 1 and 2 μm square pits
Compression was applied as a mechanical stimulus to deform the microstructured PETMP-TTT polymer films
Summary
Shape-memory polymers (SMPs) belong to the class of smart materials. They can remember their permanent shape and return to it from a deformed temporary shape under an external stimulus such as heat, light, microwaves, pressure, pH, moisture, solvent, electric and magnetic fields [1,2]. SMPs have gained significant interest for fundamental research and applications in medicine, photonics, smart textiles, microelectromechanical systems, aerospace, etc. The netpoints are responsible for recovery of the permanent shape, whereas reversible segments serve to fix the temporary shape by crystallization, glass transition or reversible bonds.
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