1C12 Relation between Molecular Orientation of Liquid Crystal Monolayer and the Underlying Polyimide Film Surface Exposed to Linearly Polarized UV Light

Abstract

We have determined the relation between the in-plane anisotropy of the molecular orientation of a liquid crystal (LC) monolayer and the underlying polyimide film exposed to linearly polarized ultraviolet light (LPUVL). To evaluate the anisotropy of the LC monolayer and the polyimide film surface, the sample orientation dependence of the polarized infrared absorption spectra was measured. The in-plane anisotropy of the LC monolayer was proportional to that of the polyimide film surface. This result suggests that the alignment of the LC molecules in contact with the LPUVL-exposed polyimide film is induced by a shortrange interaction between the polyimide and LC molecules.