Structure of cholesteric gels and their electrically induced light scattering and colour changes
| Autor: | B. H. Zwerver, Rifat Ata Mustafa Hikmet |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Materials science business.industry Analytical chemistry General Chemistry Polymer Condensed Matter Physics Light scattering chemistry.chemical_compound Monomer Photopolymer chemistry Polymerization Liquid crystal Optoelectronics Molecule General Materials Science business Circular polarization |
| Zdroj: | Liquid Crystals. 12:319-336 |
| ISSN: | 1366-5855 0267-8292 |
| Popis: | Networks with a helical structure containing large amounts of low mass liquid crystal molecules (gels) were produced by photopolymerization of a nematic diacrylate in the presence of low mass cholesteric mixtures. Prior to polymerization the systems selectively reflected a band of circularly polarized light. Upon polymerization, the gels obtained gave rise to two reflection peaks which were subsequently associated with polymer rich and polymer poor phases. At high network concentrations (>40 per cent w/w) one of the peaks did not appear, indicating that the behaviour of the molecules which were not chemically attached to the network was totally dominated by the network. From the gap required for the suppression of the rotation of the director, it was estimated that the molecules, which were not crosslinked, were confined in layers thinner than 85 nm. The gels were very transparent and did not give rise to excess light scattering as compared with the monomeric state. Upon application of an electri... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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