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ESR and Optical Study of Photo-Orientation in Azobenzene-Containing Liquid-Crystalline Polymer B
- Bogdanov, Alexey V., Vorobiev, Andrey Kh.
- The Journal of physical chemistry 2013 v.117 no.40 pp. 12328-12338
- models, physical chemistry, polymers, prediction
- We report a comprehensive experimental study of photoinduced processes in azobenzene-containing liquid-crystalline polymer. The kinetic and optical characteristics of the photoisomerization reaction and photo-orientation process have been determined. The spin probe technique has been used to elucidate the details of orientation order and rotational mobility of molecular fragments within the liquid-crystalline polymer. The evolution of orientation order parameters ⟨P₂⟩, ⟨P₄⟩, and ⟨P₆⟩ in the course of photoinduced ordering of the material as well as the change of liquid-crystalline domain sizes have been studied quantitatively. The obtained experimental results are compared with the predictions of the existing models of photo-orientation.