Photoalignment of liquid crystals using a covalently attached self-assembled ultrathin film fabricated from diazoresin and cinnamate polyelectrolyte

	Photoalignment of liquid crystals using a covalently attached self-assembled ultrathin film fabricated from diazoresin and cinnamate polyelectrolyte
其他题名	论文其他题名
	Zhang L. L.; Peng Z. H.; Yao L. H.; Lv F. Z.; Li X.
	2007
发表期刊	Journal of Materials Chemistry
ISSN	0959-9428
卷号	17 期号:29 页码:3015-3022
摘要	Layer-by-layer films have been fabricated from diazoresin (DR) and poly[4- sulfonyl phenoxy(4-acryloyloxy) cinnamate, sodium salt] (PACSS) in aqueous solution via electrostatic attraction. The ionic bonds between the diazonium ions and sulfonate ions in the film were converted into covalent bonds by irradiation with 365 nm UV light. It was also confirmed that the vinylene units of the cinnamoyl group in PACSS did not change in this process. Covalently attached self-assembled ultrathin films containing photosensitive cinnamoyl groups could align liquid crystals (LC) uniformly with good stability after irradiation with linearly polarized ultraviolet light (LPUVL). In this work, polarized UV-vis spectroscopy was utilized to investigate the photochemical process of the covalent film. It was found that cinnamoyl moieties parallel to the polarization direction of the LPUVL were consumed by the photoreaction faster than those perpendicular to the polarization direction. It can be concluded that the selective photoreaction induced the anisotropy of the films. Experimental results revealed that the degree of photoreaction and the dichroic ratio of the films depended on the number of adsorbed layers and the irradiation time. These results were correlated with the LC homogeneous alignment behavior in the parallel LC cell. The reorientation behavior of the LC molecules was found to be associated with the covalent film thickness and irradiation time.
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/26599
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhang L. L.,Peng Z. H.,Yao L. H.,et al. Photoalignment of liquid crystals using a covalently attached self-assembled ultrathin film fabricated from diazoresin and cinnamate polyelectrolyte[J]. Journal of Materials Chemistry,2007,17(29):3015-3022.
APA	Zhang L. L.,Peng Z. H.,Yao L. H.,Lv F. Z.,&Li X..(2007).Photoalignment of liquid crystals using a covalently attached self-assembled ultrathin film fabricated from diazoresin and cinnamate polyelectrolyte.Journal of Materials Chemistry,17(29),3015-3022.
MLA	Zhang L. L.,et al."Photoalignment of liquid crystals using a covalently attached self-assembled ultrathin film fabricated from diazoresin and cinnamate polyelectrolyte".Journal of Materials Chemistry 17.29(2007):3015-3022.

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