Stability Of Liquid Crystal Alignment Research Articles

Morphology Analysis for Effect of the Polymer Cluster Produced from Adamantyl-bearing Trifunctional Monomer on the Stability of Liquid Crystal Alignment

Abstract Effect on stability of liquid crystal (LC) alignment due to formation of polymer clusters on alignment films produced from the copolymer of 1,3,5-triacryloyloxyadamantane and 4,4′-diacryloyloxybiphenyl was investigated with morphology analysis. Experimental results revealed that the stability of the LC alignment was increased because the polymer clusters effectively held the LC molecules adjacent to the polymer clusters.

高分子クラスター形成による液晶配向安定化に影響する高分子クラスター形成用モノマーの重合基の効果

高分子クラスター形成による液晶配向安定化に影響する高分子クラスター形成用モノマーの重合基の効果

アダマンチル基を有する三官能モノマーを用いた高分子クラスター形成による液晶配向安定化

アダマンチル基を有する三官能モノマーを用いた高分子クラスター形成による液晶配向安定化

P‐254: Late‐News Poster: Investigation into Stability of Liquid Crystal Alignment with Newly Developed Polyimide Based Photopolymer

AbstractWe investigated the UV and thermal stability of newly developed PI based photopolymer. Image sticking effects of the test cell fabricated by the photoalignment method is compared to that by the rubbing method. Not only the UV and thermal stability, but also the image sticking effect is equivalent to those of the test cell fabricated by the rubbing method. We also demonstrate IPS cell fabricated by the photoalignment method with our material.

Synthesis, photo-reaction and photo-induced liquid crystal alignment of soluble polyimide with pendant cinnamate group

In this paper, the synthesis, photo-reaction and photo-induced liquid crystal alignment of a polyimide with a pendant cinnamate group are reported. The polyimide was synthesized by the thermal imidization of the polyamic acid derived from 4,4'-(hexafluoro-isopropylidene)diphthalic anhydride and hydroxydiaminopropane, followed by the attachment of the cinnamate group to the main chain polyimide. The surface of thin layers of the polyimide was found to be preferentially occupied by the pendant cinnamate groups, and liquid crystal alignment on the polyimide thin film exposed to polarized UV was independent of the cinnamate content. The thermal stability of the photo-induced liquid crystal alignment was enhanced with decrease in the cinnamate content. This could be attributed to the strong interchain interaction of the polyimide chains which prevents thermal randomization of the photo-product of the pendant cinnamates. The dependences of the photo-reaction temperature and the annealing temperature of the alignment layer on the azimuthal anchoring energy of the photo-aligned liquid crystal suggest that the local stress developed during the UV irradiation profoundly influences the thermal stability of the liquid crystal alignment.