http://www.cnr.it/ontology/cnr/individuo/prodotto/ID166906
Physics of polymers at the Italian high-field EPR facility: Heterogeneities and fast dynamics (Articolo in rivista)
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- Physics of polymers at the Italian high-field EPR facility: Heterogeneities and fast dynamics (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
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- Bercu V.; Martinelli M.; Massa C. A.; Pardi L. A.; Leporini D. (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- \"[Bercu, V.; Leporini, D.] Univ Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy; [Bercu, V.; Martinelli, M.; Massa, C. A.; Pardi, L. A.] CNR, Ist & Proc Chim Fis, I-56100 Pisa, Italy; [Leporini, D.] CNR, Res Ctr, Ist Nazl Fis Mat, I-56100 Pisa, Italy (literal)
- Titolo
- Physics of polymers at the Italian high-field EPR facility: Heterogeneities and fast dynamics (literal)
- Abstract
- The reorientation of the paramagnetic molecule 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) dissolved in glassy polystyrene (PS) is studied by electron paramagnetic resonance (EPR) spectroscopy in a wide range of Larmor frequencies (9-285 GHz). High-field EPR reveals that TEMPO rotates by small angular steps with a distribution of correlation times and is able to detect the onset of fast motion of PS. Differently, X-band EPR shows that TEMPO undergoes a large-angle reorientation with virtually no distribution of correlation times and largely misses the fast dynamics of PS. A unified view is proposed. (literal)
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