A patterned mechanochromic photonic polymer for reversible image reveal

Pei Zhang, Xiuyi Shi, Albert P.H.J. Schenning, Guofu Zhou (Corresponding author), Laurens T. de Haan (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Article number1901878
Number of pages7
JournalAdvanced Materials Interfaces
Volume7
Issue number3
Early online date23 Dec 2019
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • cholesteric liquid crystals
  • image reveal
  • liquid crystal elastomers
  • mechanochromic

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