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Photoreaction and Photoalignment Behavior of Novel Polyamic-Ester Derivative Containing a Photo-Crosslinkable Group

This paper describes the photoalignment behavior of liquid crystals (LCs) on a photoalignment layer containing a new photosensitive polyamic-ester derivative (PAE) under several fabricating conditions. Irradiating PAE films with a linearly polarized (LP) UV light at temperatures over 160°C dramatically accelerated the photoreaction and photoinduced optical anisotropy. Furthermore, an improvement of the LC alignment quality was observed on PAE films when films were irradiated over 160°C.