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PHOTO-ORIENTATION IN AZOBENZENE CONTAINING POLYBUTADIENE BASED POLYMER

D. Rais1,* , S. Nešpurek1,2, Y. Zakrevskyy3, J. Stumpe3, Z. Sedláková1, M. Studenovský1

Affiliation

  1. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
  2. Chemical Faculty, Technical University of Brno, Purkynova 118, 612 00 Brno, Czech Republic
  3. Fraunhofer Institute for Applied Polymer Research, Science Campus Golm, Geiselbergstr. 69, D-14476 Potsdam, Germany

Abstract

The photochemical behavior of a liquid crystalline polymer based on HO-terminated telechelic polybutadiene Krasol LBH 3000 grafted with 5-(4-{[4 (octyloxy)phenyl]azo}phenoxy)pentane-1-thiol units was studied. The photochemically induced trans-cis-trans isomerization cycles of azobenzene groups resulted in their local reorientation upon irradiation with linearly polarized UV light of He-Cd laser. The irradiation led to a reorientation of the azobenzene chromophores perpendicular to the electric field vector and in this way to the induction of stable anisotropy represented by a maximum of dichroic ratio of 5.6 at 325 nm. The resulting dichroism and birefringence was quite stable. Erasing of the orientation was carried out by the irradiation with 365 nm light of Hg-lamp. Upon irradiation with polarized and non-polarized light of the lamp, the polymer film went to a completely disordered state. Further irradiation with the linearly polarized laser beam led again to the induction of anisotropy..

Keywords

Azobenzene, Polybutadien, Photo-orientation, Anisotropy.

Submitted at: April 19, 2005
Accepted at: May 26, 2005

Citation

D. Rais, S. Nešpurek, Y. Zakrevskyy, J. Stumpe, Z. Sedláková, M. Studenovský, PHOTO-ORIENTATION IN AZOBENZENE CONTAINING POLYBUTADIENE BASED POLYMER, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 3, pp. 1371-1375 (2005)