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 in | Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Vol. 360; no. 1; pp. 81 - 91 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Taylor & Francis Group
01.04.2001
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 1058-725X |
DOI: | 10.1080/10587250108025699 |