Characterization of the motion of spin probes and spin labels in amorphous polymers with two-dimensional field-step ELDOR
| Autor: | Ulrich Wiesner, T. Volkmer, J. W. Saalmueller, Hans Wolfgang Spiess, H. W. Long, G. G. Maresch |
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| Rok vydání: | 1996 |
| Předmět: |
Acrylate polymer
chemistry.chemical_classification Polymers and Plastics Relaxation (NMR) Polymer Condensed Matter Physics Amorphous solid law.invention Condensed Matter::Soft Condensed Matter Spin probe chemistry.chemical_compound chemistry Chemical physics law Polymer chemistry Materials Chemistry Physical and Theoretical Chemistry Glass transition Electron paramagnetic resonance Spin label |
| Zdroj: | Journal of Polymer Science Part B: Polymer Physics. 34:1093-1104 |
| ISSN: | 1099-0488 0887-6266 |
| DOI: | 10.1002/(sici)1099-0488(19960430)34:6<1093::aid-polb7>3.0.co;2-z |
| Popis: | The motion of nitroxide spin probes and spin labels in amorphous polymers is studied below the glass transition temperature with a two-dimensional pulsed electron double-resonance experiment. Polystyrene and a liquid crystalline side group polymer are studied using both spin probes and spin labels covalently bound to specific sites along the polymer chain. Two methyl acrylic polymers differing only in their side group structure and polyvinylacetate are compared and large differences in the molecular dynamics deduced from both the nuclear and the electron spin relaxation rates are observed as the glass transition is approached. The results demonstrate the complexity of small amplitude motion in simple polymers below the glass transition temperature and show that it is very sensitive to the packing in the polymer. © 1996 John Wiley & Sons, Inc. |
| Databáze: | OpenAIRE |
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