Three-state Structural Switching and Selective Molecular Interactions of Cylindrical Concentric Monodomain Liquid Crystal Elastomer

Mieko Arisawa; Miyu Yoshida; Kohei Fukumoto; Tsukasa Sawato; Masahiko Yamaguchi; Masaki Matsubara; Kiyoshi Kanie

doi:10.1002/slct.202103490

Three-state Structural Switching and Selective Molecular Interactions of Cylindrical Concentric Monodomain Liquid Crystal Elastomer

Mieko Arisawa, Miyu Yoshida, Kohei Fukumoto, Tsukasa Sawato, Masahiko Yamaguchi, Masaki Matsubara, Kiyoshi Kanie

Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

Abstract

A cross-linked poly(acrylate) containing an ethynylhelicene (P)-pentamer was synthesized by radical polymerization between two horizontally aligned films with a parallel arrangement in trifluoromethylbenzene. The resulting liquid crystal elastomer swollen in bromobenzene showed the Maltese cross, which indicated a cylindrical concentric monodomain structure of the millimeter-order size as determined by polarized optical microscopy (POM) analysis. In toluene, a homogeneously bright POM image was obtained, which reversibly changed in intensity upon heating and cooling. Addition of an (M)-tetramer to the liquid crystal elastomer in toluene produced a hetero-double-helix exhibiting the Maltese cross, whose intensity did not change upon heating and cooling. The three states can be switched by addition and removal of an (M)-tetramer and solvents.

Original language	English
Pages (from-to)	12604-12609
Number of pages	6
Journal	ChemistrySelect
Volume	6
Issue number	45
DOIs	https://doi.org/10.1002/slct.202103490
Publication status	Published - 2021 Dec 6

Keywords

Ethynylhelicene oligomer
Liquid crystals
Polymers
Selective molecular interactions
Thermoresponse

ASJC Scopus subject areas

Chemistry(all)

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10.1002/slct.202103490

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title = "Three-state Structural Switching and Selective Molecular Interactions of Cylindrical Concentric Monodomain Liquid Crystal Elastomer",

abstract = "A cross-linked poly(acrylate) containing an ethynylhelicene (P)-pentamer was synthesized by radical polymerization between two horizontally aligned films with a parallel arrangement in trifluoromethylbenzene. The resulting liquid crystal elastomer swollen in bromobenzene showed the Maltese cross, which indicated a cylindrical concentric monodomain structure of the millimeter-order size as determined by polarized optical microscopy (POM) analysis. In toluene, a homogeneously bright POM image was obtained, which reversibly changed in intensity upon heating and cooling. Addition of an (M)-tetramer to the liquid crystal elastomer in toluene produced a hetero-double-helix exhibiting the Maltese cross, whose intensity did not change upon heating and cooling. The three states can be switched by addition and removal of an (M)-tetramer and solvents.",

keywords = "Ethynylhelicene oligomer, Liquid crystals, Polymers, Selective molecular interactions, Thermoresponse",

author = "Mieko Arisawa and Miyu Yoshida and Kohei Fukumoto and Tsukasa Sawato and Masahiko Yamaguchi and Masaki Matsubara and Kiyoshi Kanie",

note = "Funding Information: . This research was supported by the Platform Project for Supporting Drug Discovery and Life Science Research from AMED (Grant Number JP19am0101100) Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",

year = "2021",

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doi = "10.1002/slct.202103490",

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AU - Arisawa, Mieko

AU - Yoshida, Miyu

AU - Fukumoto, Kohei

AU - Sawato, Tsukasa

AU - Yamaguchi, Masahiko

AU - Matsubara, Masaki

AU - Kanie, Kiyoshi

N1 - Funding Information: . This research was supported by the Platform Project for Supporting Drug Discovery and Life Science Research from AMED (Grant Number JP19am0101100) Publisher Copyright: © 2021 Wiley-VCH GmbH

PY - 2021/12/6

Y1 - 2021/12/6

N2 - A cross-linked poly(acrylate) containing an ethynylhelicene (P)-pentamer was synthesized by radical polymerization between two horizontally aligned films with a parallel arrangement in trifluoromethylbenzene. The resulting liquid crystal elastomer swollen in bromobenzene showed the Maltese cross, which indicated a cylindrical concentric monodomain structure of the millimeter-order size as determined by polarized optical microscopy (POM) analysis. In toluene, a homogeneously bright POM image was obtained, which reversibly changed in intensity upon heating and cooling. Addition of an (M)-tetramer to the liquid crystal elastomer in toluene produced a hetero-double-helix exhibiting the Maltese cross, whose intensity did not change upon heating and cooling. The three states can be switched by addition and removal of an (M)-tetramer and solvents.

AB - A cross-linked poly(acrylate) containing an ethynylhelicene (P)-pentamer was synthesized by radical polymerization between two horizontally aligned films with a parallel arrangement in trifluoromethylbenzene. The resulting liquid crystal elastomer swollen in bromobenzene showed the Maltese cross, which indicated a cylindrical concentric monodomain structure of the millimeter-order size as determined by polarized optical microscopy (POM) analysis. In toluene, a homogeneously bright POM image was obtained, which reversibly changed in intensity upon heating and cooling. Addition of an (M)-tetramer to the liquid crystal elastomer in toluene produced a hetero-double-helix exhibiting the Maltese cross, whose intensity did not change upon heating and cooling. The three states can be switched by addition and removal of an (M)-tetramer and solvents.

KW - Ethynylhelicene oligomer

KW - Liquid crystals

KW - Polymers

KW - Selective molecular interactions

KW - Thermoresponse

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Three-state Structural Switching and Selective Molecular Interactions of Cylindrical Concentric Monodomain Liquid Crystal Elastomer

Abstract

Keywords

ASJC Scopus subject areas

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