The Onset of the Fast Dynamics in Glassy Polystyrene Observed by the Detrapping of Guest Molecules: a High-Field Electron Paramagnetic Resonance Study. (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• The Onset of the Fast Dynamics in Glassy Polystyrene Observed by the Detrapping of Guest Molecules: a High-Field Electron Paramagnetic Resonance Study. (Articolo in rivista) (literal)

Anno

• 2005-01-01T00:00:00+01:00 (literal)

Alternative label

• Bercu, V.; Martinelli, M.; Massa, C.A.; Pardi, L.A.; Leporini, D. (2005)
  The Onset of the Fast Dynamics in Glassy Polystyrene Observed by the Detrapping of Guest Molecules: a High-Field Electron Paramagnetic Resonance Study.
  in Europhysics letters (Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Bercu, V.; Martinelli, M.; Massa, C.A.; Pardi, L.A.; Leporini, D. (literal)

Pagina inizio

• 590 (literal)

Pagina fine

• 596 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 72 (literal)

Rivista

• Europhysics letters (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Consiglio Nazionale delle Ricerche, Università di Pisa (literal)

Titolo

• The Onset of the Fast Dynamics in Glassy Polystyrene Observed by the Detrapping of Guest Molecules: a High-Field Electron Paramagnetic Resonance Study. (literal)

Abstract

• The reorientation of the paramagnetic molecule TEMPO dissolved in glassy polystyrene (PS) is studied by high-field Electron Paramagnetic Resonance spectroscopy. Two different regimes separated by a crossover region are evidenced. Below 180 K the rotational times are nearly temperature independent with no apparent distribution. TEMPO is trapped. In the temperature range 180-220 K a large increase of the rotational mobility is observed with widening of the distribution of correlation times which exhibits two components: i) a delta-like, temperature-independent component representing the fraction of TEMPO w still trapped; ii) a strongly temperature-dependent component representing the fraction of untrapped TEMPO 1-w undergoing activated motion over an exponential distribution of barrier heights. Above 180 K a steep decrease of w is evidenced. The detrapping of TEMPO and the onset of its large increase of the rotational mobility at 180 K are interpreted as signatures of the onset of the fast motion detected by neutron scattering at T-f = 175 +/- 25 K. (literal)

Prodotto di

• Istituto per i processi chimico-fisici (IPCF) (Istituto)
• Struttura e dinamica in sistemi autoorganizzati e cooperativi (MD.P01.012.001) (Modulo)

Autore CNR

• MASSIMO MARTINELLI (Persona)
• LUCA PARDI (Unità di personale interno)

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• Parole chiave di "The Onset of the Fast Dynamics in Glassy Polystyrene Observed by the Detrapping of Guest Molecules: a High-Field Electron Paramagnetic Resonance Study." (Insieme di parole chiave)

Incoming links:

Prodotto

• Istituto per i processi chimico-fisici (IPCF) (Istituto)
• Struttura e dinamica in sistemi autoorganizzati e cooperativi (MD.P01.012.001) (Modulo)

Autore CNR di

• LUCA PARDI (Unità di personale interno)
• MASSIMO MARTINELLI (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Europhysics letters (Rivista)

Insieme di parole chiave di

• Parole chiave di "The Onset of the Fast Dynamics in Glassy Polystyrene Observed by the Detrapping of Guest Molecules: a High-Field Electron Paramagnetic Resonance Study." (Insieme di parole chiave)