Side-Group Liquid Crystal Copolymers Containing Nonmesogenic Units: Dependence of the Thermal Behaviour upon Composition

Andrew G. Cook, Corrie T. Imrie

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The synthesis and properties of a new mesogenic/nonmesogenic copolymer system, namely the poly [6-(4'-methoxyazobenzene-4'-oxy)hexyl methacrylate]-co-poly[methyl methacry late]s, are described. Copolymers containing 0.59 or greater mol fraction of the mesogenic side-groups exhibit nematic behaviour while those containing 0.39 or less mol fraction mesogen are amorphous. The glass transition temperatures exhibit a negative deviation from linear behaviour on varying the copolymer composition. In contrast, the nematic-isotropic transition temperatures decrease in an essentially linear fashion on increasing the nonmesogen content, This behaviour is compared with that of a smectogenic series and differences are accounted for in terms of a microphase separated smectic phase.

Original languageEnglish
Pages (from-to)189-198
Number of pages10
JournalMolecular Crystals and Liquid Crystals Science and Technology. Section A, Molecular Crystals and Liquid Crystals
Volume332
Issue number1
DOIs
Publication statusPublished - 1999

Keywords

  • liquid crystal side-group copolymers
  • nonmesogenic units
  • polymethacrylate derivatives
  • azobenzene
  • HETEROCYCLOALKANEDIYL GROUPS
  • MICROPHASE SEPARATION
  • POLYMERS
  • MESOGENS

Cite this

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title = "Side-Group Liquid Crystal Copolymers Containing Nonmesogenic Units: Dependence of the Thermal Behaviour upon Composition",
abstract = "The synthesis and properties of a new mesogenic/nonmesogenic copolymer system, namely the poly [6-(4'-methoxyazobenzene-4'-oxy)hexyl methacrylate]-co-poly[methyl methacry late]s, are described. Copolymers containing 0.59 or greater mol fraction of the mesogenic side-groups exhibit nematic behaviour while those containing 0.39 or less mol fraction mesogen are amorphous. The glass transition temperatures exhibit a negative deviation from linear behaviour on varying the copolymer composition. In contrast, the nematic-isotropic transition temperatures decrease in an essentially linear fashion on increasing the nonmesogen content, This behaviour is compared with that of a smectogenic series and differences are accounted for in terms of a microphase separated smectic phase.",
keywords = "liquid crystal side-group copolymers, nonmesogenic units, polymethacrylate derivatives, azobenzene, HETEROCYCLOALKANEDIYL GROUPS, MICROPHASE SEPARATION, POLYMERS, MESOGENS",
author = "Cook, {Andrew G.} and Imrie, {Corrie T.}",
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TY - JOUR

T1 - Side-Group Liquid Crystal Copolymers Containing Nonmesogenic Units

T2 - Dependence of the Thermal Behaviour upon Composition

AU - Cook, Andrew G.

AU - Imrie, Corrie T.

PY - 1999

Y1 - 1999

N2 - The synthesis and properties of a new mesogenic/nonmesogenic copolymer system, namely the poly [6-(4'-methoxyazobenzene-4'-oxy)hexyl methacrylate]-co-poly[methyl methacry late]s, are described. Copolymers containing 0.59 or greater mol fraction of the mesogenic side-groups exhibit nematic behaviour while those containing 0.39 or less mol fraction mesogen are amorphous. The glass transition temperatures exhibit a negative deviation from linear behaviour on varying the copolymer composition. In contrast, the nematic-isotropic transition temperatures decrease in an essentially linear fashion on increasing the nonmesogen content, This behaviour is compared with that of a smectogenic series and differences are accounted for in terms of a microphase separated smectic phase.

AB - The synthesis and properties of a new mesogenic/nonmesogenic copolymer system, namely the poly [6-(4'-methoxyazobenzene-4'-oxy)hexyl methacrylate]-co-poly[methyl methacry late]s, are described. Copolymers containing 0.59 or greater mol fraction of the mesogenic side-groups exhibit nematic behaviour while those containing 0.39 or less mol fraction mesogen are amorphous. The glass transition temperatures exhibit a negative deviation from linear behaviour on varying the copolymer composition. In contrast, the nematic-isotropic transition temperatures decrease in an essentially linear fashion on increasing the nonmesogen content, This behaviour is compared with that of a smectogenic series and differences are accounted for in terms of a microphase separated smectic phase.

KW - liquid crystal side-group copolymers

KW - nonmesogenic units

KW - polymethacrylate derivatives

KW - azobenzene

KW - HETEROCYCLOALKANEDIYL GROUPS

KW - MICROPHASE SEPARATION

KW - POLYMERS

KW - MESOGENS

U2 - 10.1080/10587259908023760

DO - 10.1080/10587259908023760

M3 - Article

VL - 332

SP - 189

EP - 198

JO - Molecular Crystals and Liquid Crystals Science and Technology. Section A, Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals Science and Technology. Section A, Molecular Crystals and Liquid Crystals

SN - 1058-725X

IS - 1

ER -