Host: The Japanese Liquid Crystal Society
Name : Japanese Liquid Crystal Conference 2016
Location : [in Japanese]
Date : September 05, 2016 - September 07, 2016
Photo-aligned films of an azobenzene-containing polyimide (Azo-PI) treated with octadecylamine (ODA) vapor can induce a large pretilt angle. Both average inclination angle and in-plane order of the Azo-PI backbone structure were significantly enhanced by the ODA vapor treatment. In this study, we have investigated the influence of the in-plane order of Azo-PI backbone structure on the pretilt angle generation. Photo-alignment layers with different in-plane molecular order but almost the same average inclination angle were prepared by two different photo-alignment treatments: single oblique angle irradiation of unpolarized light (UP-L) at 45º, and double light exposure of normal angle irradiation of linearly polarized light (LP-L) followed by oblique angle irradiation of UP-L. The difference in the pretilt angles generated by the two different photo-alignment layers was very small. This result suggests that the influence of the in-plane anisotropy of alignment layers on the pretilt angle generation is minor.
