Orientation of Polymer Chain of Polyimide LB Films, and Alignment of Liquid Crystals on the LB Films

Abstract

It was found that the Langmuir-Blodgett films (LB films) of polyimides deposited on a substrate had a fair ' degree of orientation to the transfer direction of the substrate. The dichroic ratio of the absorbance of the LB films parallel to the transfer direction to that perpendicular to the direction in the polarized UV spectra increased with increasing the surface pressure for deposition, whereas it was almost independent on the deposition speed and the chemical structure of polyamic acids. it was observed that the polyimide LB films made liquid crystals align orderly without rubbing treatment of the LB films. The best results were obtained when 5 layers of the LB film were used.