Confinement-induced vitrification in polyethylene terephthalate (Articolo in rivista)

Type
Label
  • Confinement-induced vitrification in polyethylene terephthalate (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.75.224201 (literal)
Alternative label
  • Baltá Calleja F. J.; G. Di Marco; A. Flores; M. Pieruccini (2007)
    Confinement-induced vitrification in polyethylene terephthalate
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Baltá Calleja F. J.; G. Di Marco; A. Flores; M. Pieruccini (literal)
Pagina inizio
  • 224201-1 (literal)
Pagina fine
  • 224201-9 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 75 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto per i Processi Chimico-Fisici Sezione di Messina, CNR, Via La Farina 237, I-98123 Messina, Italy Instituto de Estructura de la Materia, CSIC, Serrano 119, 28006 Madrid, Spain (literal)
Titolo
  • Confinement-induced vitrification in polyethylene terephthalate (literal)
Abstract
  • Dynamic mechanical thermal analysis performed on cold-drawn polyethylene terephthalate PET, cold crystallized annealed in the temperature interval 100–140 C, reveals the presence of marginally glassy domains above the annealing temperature Ta. This suggests that the thermodynamic force driving crystallization causes the structural arrest of some nonncrystalline domains. The latter thus need a temperature higher than Ta to completely defreeze. Differential scanning calorimetry supports this point of view. Analogous investigations on unoriented PET, cold crystallized in the same conditions, do not show the same peculiarities; thus, chain orientation is relevant to vitrification. This phenomenology is first cast in the language of thermodynamics by introducing an excess chemical potential delta mu describing the presence of structural constraints in the amorphous domains and the effect of chain orientation. For a first test of this picture, the orientation contribution to delta mu is calculated by means of the Gaussian chain model this implicitly assumes that delta mu is related to the density fluctuations. The resulting expression is then used to discuss the structural differences between cold-drawn and unoriented PET samples reported in the literature. (literal)
Prodotto di
Autore CNR
Insieme di parole chiave

Incoming links:


Prodotto
Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
Insieme di parole chiave di
data.CNR.it