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International Journal of Polymer Science
Volume 2011 (2011), Article ID 627195, 6 pages
http://dx.doi.org/10.1155/2011/627195
Research Article

Spirooxazine Photoisomerization and Relaxation in Polymer Matrices

1Department of Polymer Engineering and Technology, Wrocław University of Technology, 50-370 Wrocław, Poland
2Department of Physics and Astronomy, Catholic University Leuven, 3001 Heverlee, Belgium

Received 21 March 2011; Accepted 17 June 2011

Academic Editor: Qijin Zhang

Copyright © 2011 Maria Larkowska et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

9′-Hydroxy-1,3,3-trimethylspiro[indoline-2,3′[3H]naphtha[2,1-b]-1,4oxazine] (SPO-7OH) was used in studies of photochromic transformations in polymer matrices. Illumination with UV lamp caused opening the spirostructure of the oxazine with formation of open merocyanine species absorbing at ca. 610 nm. The kinetic studies of thermal relaxation of the open form showed that this process can be described with a biexponential function including both photochemical reaction and rheological behaviour of the polymeric environment. Basing on Arrhenius plot of the rate constant ascribed to the photochemical reaction, the activation energy was determined, which was 66.1 and 84.7 kJ/mole for poly(methyl methacrylate-co-butyl methacrylate) and poly(vinylpyrrolidone) matrix, respectively.