Influence of Chemical Structure on the Aligning Power of Photo-Oriented Films

The orienting ability of different azo-dyes has been investigated in films organized by individual dyes or by mixtures of a dye either with polyamide acid or with a specially synthesized dopant based on phenylquinoxalinone as well [1] . It was shown that the replacement of the functional group in th...

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Published inMolecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Vol. 360; no. 1; pp. 81 - 91
Main Authors Torgova, Sofia I., Novoseletskii, Nikolai V., Dorozhkina, Galina N., Umanskii, Boris A., Strigazzi, Alfredo
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.04.2001
Subjects
alignment
azo-dyes
chemical structure
hydrogen bonding
liquid crystals
photo-anisotropy
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Summary:The orienting ability of different azo-dyes has been investigated in films organized by individual dyes or by mixtures of a dye either with polyamide acid or with a specially synthesized dopant based on phenylquinoxalinone as well [1] . It was shown that the replacement of the functional group in the azo-dye molecules plays a very important role in the appearance or disappearance of the photo-anisotropy. The orienting films always were prepared using the spin-coating technique. Sometimes, the appearance of either planar or homeotropic orientation was dependent only on the solvent used during the spin-coating procedure. In all cases there was a good correlation between the arising of planar alignment and the existence of hydrogen bonds. We would like to underline that hydrogen bonding plays a very important role not only in the formation of mesophase [2] , but also in the interactions at the surface.
ISSN:1058-725X
DOI:10.1080/10587250108025699