Dynamics of Sulfonated Polystyrene Ionomers Using Broadband Dielectric Spectroscopy
| Autor: | James Runt, Robert J. Klein, Pornpen Atorngitjawat |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry Dielectric Dynamic mechanical analysis Sulfonic acid Inorganic Chemistry chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Polymer chemistry Materials Chemistry Polystyrene Fourier transform infrared spectroscopy Glass transition Ionomer |
| Zdroj: | Macromolecules. 40:991-996 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma061516r |
| Popis: | The dynamics of sulfonated polystyrene ionomers were investigated by using broadband dielectric relaxation spectroscopy. Dynamic mechanical analysis, Fourier transform infrared spectroscopy, differential scanning calorimetry, and small-angle X-ray scattering were employed in a complementary role. Sulfonated polystyrene ionomers were prepared from the precursor sulfonic acid polystyrene, having 1 and 7 mol % sulfonic acid, by exchanging the protons of the acid functionality with Na, Cs, and Zn cations. Three dielectric relaxations were observed above the glass transition temperature: the segmental α process and relaxations associated with Maxwell−Wagner−Sillars interfacial polarization and electrode polarization. The low-frequency broadening of the α transition is related to constraints imposed by the ionic aggregates. A relaxation in the glassy state was observed for the precursor sulfonic acid polystyrene and ionomers and attributed to the local motion of sulfonated phenyl groups. The relaxation strengt... |
| Databáze: | OpenAIRE |
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