Secondary relaxations in heterocyclic polymer networks: A study of mechanical spectroscopy (Articolo in rivista)

Type

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

Label

• Secondary relaxations in heterocyclic polymer networks: A study of mechanical spectroscopy (Articolo in rivista) (literal)

Anno

• 2009-01-01T00:00:00+01:00 (literal)

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

• 10.1016/j.msea.2008.09.122 (literal)

Alternative label

• G. Carini Jr; G. Carini; S. La Rocca; G. Tripodo; A. Bartolotta; G. Di Marco, E. G. Privalko (2009)
  Secondary relaxations in heterocyclic polymer networks: A study of mechanical spectroscopy
  in Materials science & engineering. A, Structural materials: properties, microstructure and processing
  (literal)

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

• G. Carini Jr; G. Carini; S. La Rocca; G. Tripodo; A. Bartolotta; G. Di Marco, E. G. Privalko (literal)

Pagina inizio

• 251 (literal)

Pagina fine

• 254 (literal)

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

• 521 (literal)

Rivista

• Materials science & engineering. A, Structural materials: properties, microstructure and processing (Rivista)

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

• 4 (literal)

Note

• ISI Web of Science (WOS) (literal)

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

• Dipartimento di Fisica, Università di Messina, Salita Sperone 31, I-98166 Messina, Italy Istituto per i Processi Chimico-Fisici del C. N. R., Sezione di Messina, Italy Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 253160 Kiev, Ukraine (literal)

Titolo

• Secondary relaxations in heterocyclic polymer networks: A study of mechanical spectroscopy (literal)

Abstract

• Experiments of differential scanning calorimetry and dynamic mechanical spectroscopy on linear and cross-linked heterocyclic polymer networks (HPNs) have been performed over the temperature range between 120 and 400K. The temperature dependences of the storage modulus E' and the internal friction Q-1 of HPNs, investigated by mechanical waves of frequencies ranging between 0.3 and 30 Hz, reveal anelastic behaviors which are mainly governed by the secondary beta- and primary alfa-relaxations. The addition of cross-links in an apparently linear polymer network was accompanied by the shift of the glass transition to higher temperatures. Differently fromthe ?-relaxation whose strength decreases with cross-linking, the ?-relaxation strength increases. This observation implies the lack of any dynamical hierarchy between the local and cooperative segmental dynamics in these systems. The ?-relaxation follows the Arrhenius law with values of the characteristic frequency ?0 and the activation energy Eact ranging between 1015 and 1016 s-1 and 43.7 and 48.7 kJ/mole, respectively. In both the HPNs the ?-loss peaks have been quantitatively analyzed by the symmetric double-well potential (SDWP) model. (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

• Materials science & engineering. A, Structural materials: properties, microstructure and processing (Rivista)