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A Patterned Mechanochromic Photonic Polymer for Reversible Image Reveal
Author(s) -
Zhang Pei,
Shi Xiuyi,
Schenning Albert P. H. J.,
Zhou Guofu,
Haan Laurens T.
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201901878
Subject(s) - materials science , bilayer , structural coloration , elastomer , polymer , photomask , layer (electronics) , photonic crystal , deformation (meteorology) , bending , photonics , composite material , nanotechnology , liquid crystal , optoelectronics , membrane , resist , genetics , biology
Abstract Mechanochromic photonic polymers, which can change structural color upon mechanical deformation, are promising for many applications including strain/stress sensors and security features. Here, a patterned poly(dimethylsiloxane) (PDMS)/cholesteric liquid crystal elastomer (CLCE) photonic mechanochromic bilayer film for reversible image reveal is reported, in which the PDMS component determines the mechanical properties and the CLCE determines the mechanochromic properties. The structural color pattern is achieved by locally crosslinking the CLCE layer at different temperatures using a photomask and utilizing the temperature response of the cholesteric liquid crystal main‐chain oligomers. The resulting PDMS/CLCE bilayer is able to reversibly reveal the predesigned invisible pattern upon stretching, showing that this method can be used to convey more advanced information to a potential user than would be possible with a simple homogeneous color change. It is also demonstrated that the bilayer film can be used as a stimuli‐responsive sticker able to detect bending deformations.