Low temperature excess specific heat and fragility in semicrystalline polymers (Articolo in rivista)

Type

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

Label

• Low temperature excess specific heat and fragility in semicrystalline polymers (Articolo in rivista) (literal)

Anno

• 1996-01-01T00:00:00+01:00 (literal)

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

• 10.1103/PhysRevB.54.15056 (literal)

Alternative label

• G. Carini, G. D'angelo, G. Tripodo, A. Bartolotta, G. Di Marco (1996)
  Low temperature excess specific heat and fragility in semicrystalline polymers
  in Physical review. B, Condensed matter and materials physics (Online)
  (literal)

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

• G. Carini, G. D'angelo, G. Tripodo, A. Bartolotta, G. Di Marco (literal)

Pagina inizio

• 15056 (literal)

Pagina fine

• 15063 (literal)

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

• http://link.aps.org/doi/10.1103/PhysRevB.54.15056 (literal)

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

• 54 (literal)

Rivista

• Physical review. B, Condensed matter and materials physics (Rivista)

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

• 21 (literal)

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

• CNR IPCF UNIME (literal)

Titolo

• Low temperature excess specific heat and fragility in semicrystalline polymers (literal)

Abstract

• The specific heats of polyethylene oxide (PEO) polymers with two different degrees of crystallinity and of a PEO-NaSCN polymeric complex have been measured between 1.5 and 25 K. The behavior of specific heat with decreasing crystallinity is consistent with the universal feature expected for a solid in which the topological disorder introduces an excess of low-energy vibrational modes: the peak in Cp/T3, as compared to that revealed in the most crystalline PEO, is enhanced. The specific heat has been interpreted in terms of the contributions from both the crystalline and the amorphous phases characterizing the polymer. The excess specific heat over that provided from the Debye theory has been described by an empirical phonon-fracton density of vibrational states. A density of fracton states with a dimensionality equal to 1 appears to well account for the additional localized vibrations in a polymeric network without sidebonds, such as pure PEO. A comparison between the parameter of \"fragility\" obtained from modeling the mechanical ?a relaxation of the amorphous fraction of the polymers and the excess specific heat has been tried. Within the range of fragilities explored, no definite correlation between the fragility and the density of soft vibrations has been found. (literal)

Prodotto di

• Dispositivi fotoelettrochimici, polimeri e termodinamica dei processi irreversibili (MD.P01.014.005) (Modulo)
• Istituto per i processi chimico-fisici (IPCF) (Istituto)

Autore CNR

• GAETANO DI MARCO (Persona)
• ANTONINO BARTOLOTTA (Unità di personale interno)

Incoming links:

Prodotto

• Istituto per i processi chimico-fisici (IPCF) (Istituto)
• Dispositivi fotoelettrochimici, polimeri e termodinamica dei processi irreversibili (MD.P01.014.005) (Modulo)

Autore CNR di

• ANTONINO BARTOLOTTA (Unità di personale interno)
• GAETANO DI MARCO (Persona)

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

• Physical review. B, Condensed matter and materials physics (Rivista)