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Orientational phenomena in comb‐shaped liquid crystal polymers induced by laser beam irradiation

Orientational phenomena in comb‐shaped liquid crystal polymers induced by laser beam irradiation Action of the laser illumination on optical properties of liquid crystalline (LC) comb‐shaped acrylic and methacrylic copolymers containing cyanobiphenyl mesogenic groups and azo dye fragments has been studied. Under an illumination the cis‐trans configurational changes of dye fragments take place and reorientation of the side groups towards a direction perpendicular to the electric vector of the actinic light occurs. As a result the photoinduced optical birefringence (δn = 0.05‐0.11) appears. The detailed study of dichrotic and optical properties of polymeric films, kinetics and relaxation of δn, as well as mechanism of orientational transformations during a laser illumination are discussed. The induced optical anisotropy of the films can be changed reversibly by rotating the electric vector of the laser beam in respect to the film that may be used in reversible optical data storage. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Macromolecular Symposia Wiley

Orientational phenomena in comb‐shaped liquid crystal polymers induced by laser beam irradiation

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References (5)

Publisher
Wiley
Copyright
Copyright © 1995 Hüthig & Wepf Verlag
ISSN
1022-1360
eISSN
1521-3900
DOI
10.1002/masy.19950960112
Publisher site
See Article on Publisher Site

Abstract

Action of the laser illumination on optical properties of liquid crystalline (LC) comb‐shaped acrylic and methacrylic copolymers containing cyanobiphenyl mesogenic groups and azo dye fragments has been studied. Under an illumination the cis‐trans configurational changes of dye fragments take place and reorientation of the side groups towards a direction perpendicular to the electric vector of the actinic light occurs. As a result the photoinduced optical birefringence (δn = 0.05‐0.11) appears. The detailed study of dichrotic and optical properties of polymeric films, kinetics and relaxation of δn, as well as mechanism of orientational transformations during a laser illumination are discussed. The induced optical anisotropy of the films can be changed reversibly by rotating the electric vector of the laser beam in respect to the film that may be used in reversible optical data storage.

Journal

Macromolecular SymposiaWiley

Published: Jun 1, 1995

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