Photoalignment of Pentyl-Cyanobiphenyl on the Fluorinated Polyvinyl-Cinnamates Induced by UV and Visible Light

Abstract We present the measurements of anchoring energy, pretilt angle and sliding ability of 5CB on fluoro-substituted poly(vinylcinnamates) (PVCN-Fs). It is found that the position of the fluoro-fragments with respect to the benzene ring is crucial for the anchoring properties of PVCN-Fs. We report also the photoalignment effect under the irradiation of PVCN-Fs layer with visible light and we evidenced isomerization of para-PVCN-F by Raman Spectroscopy.