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The Effect of Hydrogen Bonding on the Mesomorphic Properties for Side Chain Type Liquid Crystalline Polyurethanes

Published online by Cambridge University Press:  10 February 2011

T. Mihara  and
N. Koide
T. Mihara
Affiliation:
Department of Chemistry, Faculty of Science, Science University of Tokyo 1–3 Kagurazaka, Shinjuku-ku, Tokyo 162 JAPAN, nkoide@ch.kagu.sut.ac.jp
N. Koide
Affiliation:
Department of Chemistry, Faculty of Science, Science University of Tokyo 1–3 Kagurazaka, Shinjuku-ku, Tokyo 162 JAPAN, nkoide@ch.kagu.sut.ac.jp
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Abstract

Mesomorphic properties and temperature dependence of the hydrogen bonding between urethane bonds (H-bonding) for side chain type liquid crystalline polyurethane(SLCPU)s were studied by thermally controlled FT-IR spectroscopy. A remarkable change in the strength of H-bonding for SLCPUs with a flexible chain in the polymer backbone(flexible SLCPUs) was displayed near the phase transition temperatures, while small changes in the strength of H-bonding for SLCPUs with a rigid moiety in the polymer backbone(rigid SLCPUs) was influenced by a mesogenic group in the side chain and the flexible chain length in the polymer backbone. Furthermore, in order to study the influence of H-bonding in rigid SLCPUs, polyurethane derivatives with methyl group were synthesized replacing hydrogen in urethane bonds. No mesomorphic properties for polyurethane derivatives obtained were exhibited. It was concluded that H-bonding played an important role to exhibit mesomorphic properties of rigid SLCPUs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 425: Symposium I – Liquid Crystals for Advanced Technologies , 1996 , 61
Copyright
Copyright © Materials Research Society 1996

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