Physics of Polymers at the Italian High-Field EPR Facility: Heterogeneities and Fast Dynamics

. 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 an...

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Bibliographic Details
Published in:Applied magnetic resonance 2008-05, Vol.33 (4), p.365, Article 365
Main Authors: Bercu, V., Martinelli, M., Massa, C. A., Pardi, L. A., Leporini, D.
Format: Article
Language:English
Subjects:
Atoms and Molecules in Strong Fields
Electron paramagnetic resonance
Laser Matter Interaction
Organic Chemistry
Physical Chemistry
Physics
Physics and Astronomy
Polystyrene resins
Solid State Physics
Spectroscopy/Spectrometry
Superhigh frequencies
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Summary:. 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.
ISSN:0937-9347
1613-7507
DOI:10.1007/s00723-008-0076-x