Mechanochromic Displays Based on Photoswitchable Cholesteric Liquid Crystal Elastomers DOI Creative Commons
Lucas Daniel Chiba de Castro, Johan Lub, Osvaldo N. Oliveira

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 137(1)

Published: Aug. 27, 2024

Abstract Stimuli responsive optical materials are attractive for many areas, from healthcare to art design. However, creating intricate color‐changing patterns visual information is still a challenge. This work describes the preparation of mechanochromic structural colored pictures imprinted in cholesteric liquid crystal elastomers by using chiral isosorbide molecular photoswitch. The photoswitch contains photoisomerizable cinnamate moiety and was incorporated main chain oligomer with photopolymerizable acrylate end groups. After coating, film irradiated ultraviolet (UV) light air causing E/Z isomerization units leading redshift color film. A grayscale photomask used spatially control photoisomerization reaction imprint colorful such as portraits landscapes, films high resolution. Photopolymerization nitrogen atmosphere led elastomer striking colors that blueshift upon strain. sharp details were preserved even under deformation system returned initial state strain removal. Our offers simple approach prepare stimuli polymers unprecedented complexity.

Language: Английский

Mechanochromic Displays Based on Photoswitchable Cholesteric Liquid Crystal Elastomers DOI Creative Commons
Lucas Daniel Chiba de Castro, Johan Lub, Osvaldo N. Oliveira

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 137(1)

Published: Aug. 27, 2024

Abstract Stimuli responsive optical materials are attractive for many areas, from healthcare to art design. However, creating intricate color‐changing patterns visual information is still a challenge. This work describes the preparation of mechanochromic structural colored pictures imprinted in cholesteric liquid crystal elastomers by using chiral isosorbide molecular photoswitch. The photoswitch contains photoisomerizable cinnamate moiety and was incorporated main chain oligomer with photopolymerizable acrylate end groups. After coating, film irradiated ultraviolet (UV) light air causing E/Z isomerization units leading redshift color film. A grayscale photomask used spatially control photoisomerization reaction imprint colorful such as portraits landscapes, films high resolution. Photopolymerization nitrogen atmosphere led elastomer striking colors that blueshift upon strain. sharp details were preserved even under deformation system returned initial state strain removal. Our offers simple approach prepare stimuli polymers unprecedented complexity.

Language: Английский

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