New polymethacrylates having a carbonate linkage between the spacer and the mesogenic unit in the side chain

New side chain homo- and copolymethacrylates with a carbonate linkage between the spacer and the mesogenic unit were prepared by the free radical polymerization of monomers having 4-cyanobiphenyl and/or 4′-methoxybenzylideneaniline as mesogens, whose structures were confirmed by FTIR and 1H-NMR spec...

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Bibliographic Details
Published inEuropean polymer journal Vol. 30; no. 8; pp. 885 - 890
Main Authors Sato, Moriyuki, Nakano, Takashi, Mukaida, Ken-Ichi
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.08.1994
Elsevier
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular structures
Preparation, kinetics, thermodynamics, mechanism and catalysts
Methacrylate polymer
Free radical polymerization
Side chain
Organic carbonate
Biphenyl derivatives
Preparation
Thermotropic state
Methacrylate copolymer
Radical copolymerization
Experimental study
Liquid crystals
Phase transitions
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Summary:New side chain homo- and copolymethacrylates with a carbonate linkage between the spacer and the mesogenic unit were prepared by the free radical polymerization of monomers having 4-cyanobiphenyl and/or 4′-methoxybenzylideneaniline as mesogens, whose structures were confirmed by FTIR and 1H-NMR spectra and elemental analyses. Thermal and mesogenic properties of the monomers and the polymers were evaluated by differential scanning calorimetry, X-ray analyses and polarizing microscopy. It was discovered that only the homopolymer with 4′-methoxybenzylideneaniline as a mesogen formed nematic mesophase, but the others had no thermotropic LC phases. This might be due to introduction of a carbonate linkage which shows an unusual geometry.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(94)90020-5