Unusual Alignment of Liquid Crystals on Rubbed Films of Polyimides with Fluorenyl Side Groups

摘要

We synthesized two polyimides (PIs), poly(4,4'-(9,9-fluorenyl)diphenylene cyclobutanyltetracarboximide) and poly(4,4'-(9,9-fluorenyl)diphenylene pyromellitimide), and investigated in detail the surface morphology, molecular orientation, and nematic liquid crystal alignments of rubbed PI films. This study found that both the PIs are promising alignment layer materials for the fabrication of advanced LC display devices.