Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition (Articolo in rivista)

Type

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

Label

• Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition (Articolo in rivista) (literal)

Anno

• 2007-01-01T00:00:00+01:00 (literal)

Alternative label

• Capaccioli, S; Prevosto, D; Kessairi, K; Lucchesi, M; Rolla, P (2007)
  Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition
  in Journal of non-crystalline solids
  (literal)

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

• Capaccioli, S; Prevosto, D; Kessairi, K; Lucchesi, M; Rolla, P (literal)

Pagina inizio

• 3984 (literal)

Pagina fine

• 3988 (literal)

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

• 353 (literal)

Rivista

• Journal of non-crystalline solids (Rivista)

Note

• ISI Web of Science (WOS) (literal)

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

• Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; INFM, CNR, Polylab, I-56127 Pisa, Italy; INFM, CNR, CRS SOFT, Dipartimento Fis, I-00185 Rome, Italy (literal)

Titolo

• Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition (literal)

Abstract

• Dielectric spectra of several typical molecular glass-formers, showing one or more secondary processes resolved in the glassy state, have been measured at different temperatures. We found that the genuine Johari-Gold stein P-relaxation is connected to the structural relaxation. In fact, a clear correlation was found between the structural relaxation time, the Johari-Goldstein relaxation time and the dispersion of the structural relaxation (i.e. its Kohlrausch parameter). Moreover, for a group of epoxide oligomers the steepness index is correlated to the broadness of the structural peak and to the time separation between the structural and the Johari-Goldstein relaxation. These results support the idea that the Johari-Goldstein relaxation acts as a precursor of the structural relaxation. A rationale for our results is provided by the coupling model. (C) 2007 Elsevier B.V. All rights reserved. (literal)

Prodotto di

• Materia soffice: Dinamica di non-equilibrio e complessita (MD.P02.014.001) (Modulo)
• Film di materiali polimerici: effett di confinamento superficiale ed applicazioni (MD.P01.017.001) (Modulo)

Autore CNR

• SIMONE CAPACCIOLI (Unità di personale interno)
• PIERANGELO ROLLA (Unità di personale esterno)
• MAURO LUCCHESI (Persona)

Insieme di parole chiave

• Keywords of "Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition" (Insieme di parole chiave)

Incoming links:

Autore CNR di

• PIERANGELO ROLLA (Unità di personale esterno)
• SIMONE CAPACCIOLI (Unità di personale interno)
• MAURO LUCCHESI (Persona)

Prodotto

• Film di materiali polimerici: effett di confinamento superficiale ed applicazioni (MD.P01.017.001) (Modulo)
• Materia soffice: Dinamica di non-equilibrio e complessita (MD.P02.014.001) (Modulo)

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

• Journal of non-crystalline solids (Rivista)

Insieme di parole chiave di

• Keywords of "Relation between the dispersion of alpha-relaxation and the time scale of beta-relaxation at the glass transition" (Insieme di parole chiave)