Light-melt adhesive based on dynamic carbon frameworks in a columnar liquid-crystal phase

Shohei Saito (), Shunpei Nobusue, Eri Tsuzaka, Chunxue Yuan, Chigusa Mori, Mitsuo Hara, Takahiro Seki, Cristopher Camacho, Stephan Irle and Shigehiro Yamaguchi
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Shohei Saito: Graduate School of Science, Kyoto University
Shunpei Nobusue: Graduate School of Science, Nagoya University
Eri Tsuzaka: Graduate School of Science, Nagoya University
Chunxue Yuan: Graduate School of Science, Nagoya University
Chigusa Mori: Graduate School of Science, Nagoya University
Mitsuo Hara: Graduate School of Engineering, Nagoya University
Takahiro Seki: Graduate School of Engineering, Nagoya University
Cristopher Camacho: Graduate School of Science, Nagoya University
Stephan Irle: Graduate School of Science, Nagoya University
Shigehiro Yamaguchi: Graduate School of Science, Nagoya University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Liquid crystal (LC) provides a suitable platform to exploit structural motions of molecules in a condensed phase. Amplification of the structural changes enables a variety of technologies not only in LC displays but also in other applications. Until very recently, however, a practical use of LCs for removable adhesives has not been explored, although a spontaneous disorganization of LC materials can be easily triggered by light-induced isomerization of photoactive components. The difficulty of such application derives from the requirements for simultaneous implementation of sufficient bonding strength and its rapid disappearance by photoirradiation. Here we report a dynamic molecular LC material that meets these requirements. Columnar-stacked V-shaped carbon frameworks display sufficient bonding strength even during heating conditions, while its bonding ability is immediately lost by a light-induced self-melting function. The light-melt adhesive is reusable and its fluorescence colour reversibly changes during the cycle, visualizing the bonding/nonbonding phases of the adhesive.

Date: 2016
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DOI: 10.1038/ncomms12094

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