Temperature Dependence of the Rigid Amorphous Fraction in Poly(ethylene terephthalate) (Articolo in rivista)

Type
Label
  • Temperature Dependence of the Rigid Amorphous Fraction in Poly(ethylene terephthalate) (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.eurpolymj.2014.06.005 (literal)
Alternative label
  • Maria Cristina Righetti, Michele Laus, Maria Laura Di Lorenzo (2014)
    Temperature Dependence of the Rigid Amorphous Fraction in Poly(ethylene terephthalate)
    in European Polymer Journal
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Maria Cristina Righetti, Michele Laus, Maria Laura Di Lorenzo (literal)
Pagina inizio
  • 60 (literal)
Pagina fine
  • 68 (literal)
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  • 58 (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, Consiglio Nazionale delle Ricerche, INSTM, UdR Pisa, Via G. Moruzzi 1, 56124 Pisa, Italy Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale 'A. Avogadro', INSTM, UdR Alessandria, Viale T. Michel 11, 15121 Alessandria, Italy Istituto per i Polimeri, Compositi e Biomateriali, Consiglio Nazionale delle Ricerche, c/o Comprensorio Olivetti, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy (literal)
Titolo
  • Temperature Dependence of the Rigid Amorphous Fraction in Poly(ethylene terephthalate) (literal)
Abstract
  • The analysis of the cp melting curve of poly(ethylene terephthalate) (PET) after non-isothermal crystallization, according to a three-phase enthalpy-based procedure, has allowed to monitor the correct crystalline and rigid amorphous fractions evolution during fusion at low heating rate and to identify the temperature of complete mobilization of the rigid amorphous fraction, located in the proximity of 215 °C. This limit temperature for the disappearance of the rigid amorphous fraction in PET corresponds to the transition between the triple and the double melting behaviour displayed by PET after isothermal crystallization. The multiple melting behaviour of PET is usually attributed to the fusion of original crystals recrystallized during the heating at conventional scanning rate, and to the presence of dual lamellar stacks. In the present study, PET was isothermally crystallized at various temperatures (Tc) ranging from 185 °C to 225 °C, and the double and triple melting profile that is observed at conventional DSC heating rates, after isothermal crystallization at Tc higher and lower than 215 °C respectively, has been put in relation with the absence and the presence of RAF around the original crystal lamellae. All the experimental evidences here reported indicate that the critical temperature for the formation and the disappearance of the rigid amorphous fraction in the PET sample analyzed in the present study at the conventional DSC scanning rates, is around 215°C. (literal)
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