Non-monotonic exposure dependence of the pretilt angle and surface polarity of the photo-orientant F-PVCN

We report on the first observation of a non-monotonic UV exposure dependence of the pretilt angle of a liquid crystal on a photoaligning surface. We found this non-monotonic dependence on fluorinated poly(vinyl cinnamate) (PVCN-F) surface while non-fluorinated PVCN revealed a monotonic decrease of t...

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Bibliographic Details
Published in:Liquid crystals 2002-02, Vol.29 (2), p.209-212
Main Authors: Bugayova, L., Gerus, I., Glushchenko, A., Dyadyusha, A., Kurioz, Yu, Reshetnyak, V., Reznikov, Yu, West, J.
Format: Article
Language:English
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Summary:We report on the first observation of a non-monotonic UV exposure dependence of the pretilt angle of a liquid crystal on a photoaligning surface. We found this non-monotonic dependence on fluorinated poly(vinyl cinnamate) (PVCN-F) surface while non-fluorinated PVCN revealed a monotonic decrease of the pretilt angle with exposure. These dependences correlate with light-induced changes of the polarity of PVCN-F and PVCN surfaces. The obtained data point to an important role of the surface polarity and the light-induced changes in mechanisms of pretilt angle generation on photoaligning materials.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678290110091644