ISSN:
1042-7147
Keywords:
Liquid crystal (LC)
;
Photoresponsive polymer
;
Photochromic reaction
;
Molecular alignment
;
Photorecording
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The alignment of a nematic liquid crystal (LC) was changed reversibly by a photochromic reaction of vinyl-polymer films bearing azobenzene (Az) chromophores. Photoisomerization of Az in the polymer films proceeded slower than in solution systems with an irreversible nature, due to a limited free volume of polymers and the presence of Az aggregates. Photoregulative Az films were obtained by two procedures: (i) spin-coating followed by baking processes: and (ii) adsorption from a LC/polymer mixture onto a lecithin-coated glass surface. Perpendicular alignment, which is achieved both in the surface Az and in the LC layer, allows a parallel interaction between them and enables the photoregulation of the LC alignment.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pat.1990.220010505
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