Chain folding in liquid-crystalline main-chain polymers with a smectic phase
| Autor: | Götz Wilbert, Manfred Stamm, Armelle B. E. Vix, Jürgen P. Rabe, Rudolf Zentel, Wolfgang Stocker |
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| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry Polymer Thermotropic crystal Inorganic Chemistry Gel permeation chromatography chemistry.chemical_compound Crystallography Differential scanning calorimetry Azobenzene chemistry Phase (matter) Polymer chemistry Materials Chemistry Thin film Pendant group |
| Zdroj: | Scopus-Elsevier |
| Popis: | Thermotropic main-chain liquid-crystalline polymers (LCPs) composed of azobenzene or azoxybenzene mesogens and flexible spacers with and without a phenyl side group have been characterized by gel permeation chromatography, differential scanning calorimetry, and X-ray diffraction. The polymers exhibit smectic phases in the well-accessible temperature range from room temperature up to 160 °C. The morphology of thin films on a solid substrate was studied by X-ray reflectometry and scanning force microscopy (SFM). The smectic layers are mainly oriented parallel to the film surface. On the basis of X-ray reflectometry and SFM investigations, it is concluded that, at least in thin films, the polymer main chains are not extended like in the common model for main-chain LCPs, but almost regularly folded. |
| Databáze: | OpenAIRE |
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