Oriented polymer dispersed discotic liquid crystals
| Autor: | Nadine Paiement, Yue Zhao, Yanick Chénard |
|---|---|
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Rufigallol Materials science Discotic liquid crystal General Chemistry Polymer Condensed Matter Physics Methacrylate Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science chemistry.chemical_compound Crystallography chemistry Liquid crystal Condensed Matter::Superconductivity Phase (matter) Organic chemistry General Materials Science Polystyrene Columnar phase |
| Zdroj: | Scopus-Elsevier |
| Popis: | Polymer dispersed discotic liquid crystals (PDDLCs) were prepared using the hexa-n-octanoate of rufigallol (RHO) and three polymer matrices: polystyrene (PS), poly(methyl methacrylate) (PMMA) and poly(ethyl methacrylate) (PEMA). The molecular orientation of RHO in stretched PDDLC films was characterized by means of infrared dichroism. It was found that the stretching of films that contain RHO in both the columnar D1 and crystalline phase can effectively align columns of RHO along the stretching direction, with the short axes of the rigid cores lying in the plane of the film. By contrast with stretched polymer dispersed nematic liquid crystals, no orientation of RHO is induced for films stretched with RHO in the isotropic phase, followed by rapid cooling to room temperature. However, if stretched films are cooled under strain into the columnar D1 phase, orientation of RHO can develop with time. |
| Databáze: | OpenAIRE |
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