Anisotropic Networks, Elastomers and Gels

Kelly, Stephen M.

doi:10.1080/13583149608047649

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…However, in the current system, most of the mesogens were covalently bonded to the polymer main chains through a methylene spacer, and the mesogenic orientation was fixed by cross-linkers. We consider these structural features to be responsible for the high reversibility of the LC behavior and the quick recovery of the LC phase from the isotropic phase [48,49]. To confirm this hypothesis, we prepared a linear LC polymer (l-LCP) without the cross-linking agent using the same polymerization procedure in the LC cell with polyimide alignment layers.…”

Section: Phase Transition Behaviormentioning

confidence: 97%

Section: Phase Transition Behaviormentioning

confidence: 99%

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Environmentally Stable Chiral-Nematic Liquid-Crystal Elastomers with Mechano-Optical Properties

Hisano

Kimura

et al. 2021

Applied Sciences

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Chiral-nematic liquid crystal (N* LC) elastomers exhibit mechano-optical responsive behavior. However, practical sensor applications have been limited by the intrinsic sensitivity of N* LC elastomers to environmental conditions, such as temperature. Although densely cross-linked LC network polymers exhibit high thermal stability, they are not proper for the mechanical sensor due to high glass transition temperatures and low flexibility. To overcome these issues, we focused on enhancing thermal stability by introducing noncovalent cross-linking sites via intermolecular interactions between LC molecules bonded to the polymer network. N* LC elastomers with a cyanobiphenyl derivative as a side-chain mesogen exhibited mechano-optical responsive behavior, with a hypsochromic shift of the reflection peak wavelength under an applied tensile strain and quick shape and color recovery owing to high elasticity. Notably, the N* LC elastomers showed high resistance to harsh environments, including high temperatures and various solvents. Interactions, such as π–π stacking and dipole–dipole interactions, between the cyanobiphenyl units can act as weak cross-links, thus improving the thermal stability of the LC phase without affecting the mechano-optical response. Thus, these N* LC elastomers have great potential for the realization of practical mechano-optical sensors.

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Section: Phase Transition Behaviormentioning

confidence: 97%

Section: Phase Transition Behaviormentioning

confidence: 99%

Environmentally Stable Chiral-Nematic Liquid-Crystal Elastomers with Mechano-Optical Properties

Hisano

Kimura

et al. 2021

Applied Sciences

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“…The crosslinking reactions of these mesogens lead to materials that combine the typical properties of liquid crystals and thermostable polymers. 11 A high mechanical modulus, a thermal expansion minor coefficient, and greater ease of processing before crosslinking are some of the advantages of these useful materials in high technology with respect to conventional liquidcrystal polymers. 12 The global molecular orientation of molecules of this kind of system can be quantified with the order parameter S, which is determined by different methods, such as birefringence and X-rays.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic network formation by the photopolymerization of new monomers derived from 4‐hydroxybenzenethiol

Sáez

Aguilera

2005

J of Applied Polymer Sci

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New polymerizable difunctional liquid crystals of monomers derived from 4-hydroxybenzenethiol were synthesized, characterized, and photopolymerized by the formation of anisotropic films. These films were obtained by the irradiation of the monomers in the mesophase with UV light before they were macroscopically oriented in glasses treated on the surface with polyimide and uniaxially rubbed. The monomers showed smectic and nematic mesophases. The thin films, uniaxially oriented, were optically transparent. The orientation was verified by IR dichroism, which showed a preferential order of mesogens.

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Introduction and Historical Development

Gray¹

1999

Physical Properties of Liquid Crystals

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Anisotropic Networks, Elastomers and Gels

Cited by 8 publications

References 13 publications

Environmentally Stable Chiral-Nematic Liquid-Crystal Elastomers with Mechano-Optical Properties

Environmentally Stable Chiral-Nematic Liquid-Crystal Elastomers with Mechano-Optical Properties

Anisotropic network formation by the photopolymerization of new monomers derived from 4‐hydroxybenzenethiol

Introduction and Historical Development

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