材料科学
辐照
叠氮化物
聚合物
液晶
丙烯酸酯
垂直的
图层(电子)
基质(化学分析)
丙烯酸酯聚合物
环己酮
复合材料
光化学
高分子化学
光学
光电子学
有机化学
化学
共聚物
数学
核物理学
催化作用
物理
几何学
作者
Yuki Kimura,Keiichi Kuboyama,Toshiaki Ougizawa
标识
DOI:10.1080/02678292.2016.1148789
摘要
Photo-reactive bisazide in a polymer matrix containing acryloyl groups on the side chain was investigated as a photoalignment layer for polymerizable liquid crystals (PLC). We found the thin film of bisazide (2,6-bis(4-azidobenzylidene)-4-methyl-1-cyclohexanone) in a polymer matrix, irradiated by linearly polarised ultraviolet light (LPUVL), was able to homogeneously align PLC. The LPUVL irradiation dose changed the orientation direction of the PLC on the thin film of bisazide in the polymer matrix. In addition, the direction of the slow axis for the retardation of the photoalignment layer changed from parallel to perpendicular to the LPUVL electric field with the irradiation dose. From these results, it was suggested that the PLC was likely to be aligned along the slow axis of the retardation of the photoalignment layer. We concluded that the key mechanism that changed the direction of the slow axis in a plane was the photoreaction of azide–acrylate at low irradiation dose and that of bis(benzylidene)cyclohexanone at high irradiation dose. Although the photoalignment as a result of a simple photo cross-linking was previously little known except for photo-dimerisation, we revealed that the photoaddition of azide–acrylate is able to achieve the photoalignment.
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