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Three-Dimensional Photoreorientation of Self-Organized Azobenzene Chromophores in Liquid Crystalline Polymer Films

Published online by Cambridge University Press:  10 February 2011

M. Han ,
S. Morino  and
K. Ichimura
M. Han
Affiliation:
Research Laboratory of Resources Utilization, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, kichimur@res.titech.ac.jp
S. Morino
Affiliation:
Research Laboratory of Resources Utilization, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, kichimur@res.titech.ac.jp
K. Ichimura
Affiliation:
Research Laboratory of Resources Utilization, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, kichimur@res.titech.ac.jp
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Abstract

Photo-induced reorientational behavior of films of a liquid crystalline polymer with azobenzene side chains was studied by means of UV-Vis absorption spectroscopy and Fourier transform infrared transmission and reflection-absorption spectroscopy. The incident directions of light for photoisomerization played a critical role in the photocontrol of out-of-plane (three-dimensional) orientation of the azobenzenes in films. Tilted directions of the azobenzene residues were evaluated by using polarized UV-Vis absorption spectra. Photoreoriented states of azobenzene chromophores including photodichroism and tilted alignment were enhanced by successive annealing of photoirradiated films at temperatures close to the glass transition temperature of the polymer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 559: Symposium D – Liquid Crystals Materials and Devices , 1999 , 159
Copyright
Copyright © Materials Research Society 1999

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References

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