Modification of the twist angle in chiral nematic polymer films by photoisomerization of the chiral dopant
| Autor: | Johan Lub, Peter Van De Witte, Martin Brehmer, Edda E. Neuteboom |
|---|---|
| Přispěvatelé: | Macro-Organic Chemistry, Macromolecular and Organic Chemistry, Stimuli-responsive Funct. Materials & Dev. |
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
chemistry.chemical_classification
Materials science Condensed matter physics Photoisomerization Dopant General Physics and Astronomy Polymer Optical storage Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Condensed Matter::Materials Science Polarization sensitive chemistry Liquid crystal Condensed Matter::Superconductivity Organic chemistry Twist angle Derivative (chemistry) |
| Zdroj: | Journal of Applied Physics, 85(11), 7517-7521. American Institute of Physics |
| ISSN: | 0021-8979 |
| DOI: | 10.1063/1.370548 |
| Popis: | A method for the production of polarization sensitive recordings in liquid crystalline polymers is presented. The system is based on local modification of the twist angle of chiral nematic polymer films. The twist angle of the polymer film is varied by modifying the chemical structure of the chiral dopant. Here a photoisomerizable menthone derivative is used that has a fivefold difference in helical twisting power between the E and the Z isomer. The twist angle of the film can be varied between −90° and 0° by introducing a nonphotosensitive chiral dopant with opposite twisting sense. Complex pictures with gray scales can be recorded in the films with black and white contrasts higher than 20. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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