Electrorheological behavior of two thermotropic and lyotropic liquid crystalline polymers
| Autor: | A. Inoue, S. Maniwa |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics General Chemistry Polymer Thermotropic crystal Surfaces Coatings and Films chemistry.chemical_compound Silicone chemistry Chemical engineering Liquid crystal Siloxane Polymer chemistry Lyotropic Materials Chemistry Side chain Benzoic acid |
| Zdroj: | Journal of Applied Polymer Science. 59:797-802 |
| ISSN: | 1097-4628 0021-8995 |
| Popis: | A thermotropic liquid crystalline (LC) polymer, consisting of an LC silicone having benzoic acid phenylester LC groups as side chains of the siloxane polymer main chain diluted with dimethylsilicone, and a lyotropic LC polymer solution, consisting of poly(γ-benzyl-L-glutamate) in 1,4-dioxane, both showed a large electrorheological (ER) effect, i.e., an instantaneous increase in shear stress upon the application of an electric field. In the electric field, the thermotropic polymer exhibited Newtonian-like flow and a dynamic viscoelasticity similar to that of low molecular weight liquid crystals, while the lyotropic polymer solution exhibited elastic flow and a dynamic viscoelasticity similar to that of particle-dispersion ER fluids. These differences in ER behavior suggest large differences in their ER mechanisms, with that of the thermotropic polymer dominated by interaction between its LC domains and that of the lyotropic polymer solution by the orientation of the dipoles of its LC groups. |
| Databáze: | OpenAIRE |
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