Determination of Ion Cluster Sizes and Cluster-to-Cluster Distances in Ionomers by Four-Pulse Double Electron Electron Resonance Spectroscopy
| Autor: | Ulrich Wiesner, M. Pannier, M. Schöps, Hans Wolfgang Spiess, V. Schädler, Gunnar Jeschke |
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| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Mesoscopic physics Polymers and Plastics Chemistry Small-angle X-ray scattering Scattering Organic Chemistry Analytical chemistry Ionic bonding Electron Polymer Molecular physics Ion Condensed Matter::Soft Condensed Matter Inorganic Chemistry Materials Chemistry Spectroscopy |
| Zdroj: | Macromolecules. 33:7812-7818 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma000800u |
| Popis: | Double electron-electron resonance (DEER) spectroscopy is introduced as a new tool for the characterization of mesoscopic structures in polymers. This method can characterize distance distributions between spin probes in a range between 1.5 and 8 nm and can be applied to the measurement of ion cluster sizes and intercluster distances in ionically end-capped polymers by using ionic spin probes that attach themselves to the surface of the ion clusters. The results on intercluster distances for systems based on homopolymers are in agreement with earlier results from small-angle X-ray scattering (SAXS), while the cluster sizes can be rationalized by comparison with a force field molecular model of an ion cluster. The DEER experiment could also be applied to an ionically end-capped diblock copolymer for which a SAXS measurement of the intercluster distance failed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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