Hydrogen‐Bonded Systems

Kato, Takashi

doi:10.1002/9783527620623.ch14

Cited by 26 publications

(6 citation statements)

References 64 publications

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“…There exist several review articles that (partially) cover the field of ILCs, of which the 2005 review by Binnemans is the most comprehensive. 2−8,20,80,91,92,94−97 It should be noted that LC charge-transfer systems 98 and hydrogen-bonded LCs 99,100 show similarities to ILCs, but these compounds will not be discussed here unless relevant in the context of ionic mesogens.…”

Section: Other Types Of Liquid Crystalsmentioning

confidence: 99%

Ionic Liquid Crystals: Versatile Materials

et al. 2016

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This Review covers the recent developments (2005-2015) in the design, synthesis, characterization, and application of thermotropic ionic liquid crystals. It was designed to give a comprehensive overview of the "state-of-the-art" in the field. The discussion is focused on low molar mass and dendrimeric thermotropic ionic mesogens, as well as selected metal-containing compounds (metallomesogens), but some references to polymeric and/or lyotropic ionic liquid crystals and particularly to ionic liquids will also be provided. Although zwitterionic and mesoionic mesogens are also treated to some extent, emphasis will be directed toward liquid-crystalline materials consisting of organic cations and organic/inorganic anions that are not covalently bound but interact via electrostatic and other noncovalent interactions.

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Section: Other Types Of Liquid Crystalsmentioning

confidence: 99%

Ionic Liquid Crystals: Versatile Materials

et al. 2016

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“…As is known, copolymerization of mesogenic and nonmesogenic monomers provides the classical means for the preparation of the above compounds when one macromolecule contains various monomer units of different chemical natures and functionalities. At the same time, such systems may also be obtained via specific noncovalent interactions of LC copolymers containing carboxyl groups with low-molecular-mass compounds (dopants) with valuable characteristics. − This approach allows the development of a new generation of advanced composite materials and their application in optoelectronics, holography, data recording, and imaging systems. The above blends may advantageously combine the properties of polymers (film-forming and fiber-forming properties as well as their ability to produce coatings) and low-molecular-mass dopants (photochromism, high optical activity, and high response to the action of magnetic fields).…”

Section: Introductionmentioning

confidence: 99%

Phase Behavior and Photooptical Properties of Liquid Crystalline Functionalized Copolymers with Low-Molecular-Mass Dopants Stabilized by Hydrogen Bonds

et al. 2005

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The approach of deriving new photooptically active polymeric substances by hydrogen bonding between functionalized liquid crystalline (LC) copolymers and low-molecular-mass dopants, containing photochromic azobenzene fragments, is described. The formation of intermolecular hydrogen bonds between carboxylic groups of functionalized LC copolymers and the pyridine fragment of the dopant leads to stable, nonseparating mixtures in a broad interval of contents (up to 30 mol % dopant molecules). The phase behavior and structure of photochromic mixtures are investigated. Induction of a nematic mesophase is observed in the case of a smectic polymer matrix doped with low-molar-mass photochromic dyes.

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“…An approach to the preparation of a new class of polymer liquid crystalline materials, the so-called functionalized LC polymers, has been proposed. − These compounds are random copolymers of two monomers. One of the monomers is mesogenic and favors LC phase formation.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and IR Spectroscopy of the Macromolecular Reaction of Anhydridization in a Functionalized Side-Chain Liquid Crystalline Copolymer Containing Acrylic Acid Groups

Zhukov¹,

Stühn²,

Borisova

et al. 2001

Macromolecules

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The anhydrization reaction has been investigated in functionalized side-chain random liquid crystalline (LC) copolymers containing cyanobiphenyl mesogenic and acrylic acid (38 mol %) groups. Heat treatment of the LC copolymer at 130 °C for 5-200 h is accompanied by formation of intra-and intermolecular anhydrides and network structures causing an increase of the glass transition and clearing temperatures. The influence of annealing on the reorientational dynamics of the copolymers was investigated by broad-band dielectric relaxation spectroscopy. The local dynamics of the side group involving spacer motion (γ relaxation) and mesogen rotation about the long axis (β relaxation) do not depend on the annealing time. At the same time a considerable (more than 2 orders of magnitude) decrease in the relaxation rates of the cooperative δ and R processes was observed due to a gradual increase in the main-chain rigidity during the annealing. The molecular mechanism of all relaxation processes detected is discussed.

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Hydrogen‐Bonded Systems

Cited by 26 publications

References 64 publications

Ionic Liquid Crystals: Versatile Materials

Ionic Liquid Crystals: Versatile Materials

Phase Behavior and Photooptical Properties of Liquid Crystalline Functionalized Copolymers with Low-Molecular-Mass Dopants Stabilized by Hydrogen Bonds

Dielectric and IR Spectroscopy of the Macromolecular Reaction of Anhydridization in a Functionalized Side-Chain Liquid Crystalline Copolymer Containing Acrylic Acid Groups

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