An experimental study on different polyesters (PET, PBT, PEN, PEA, PCT-co-ET) subjected to g-irradiation up to 1 MGy was carried out through viscometry, thermal analysis and positron annihilation lifetime spectroscopy. Chain scission induced by irradiation prevails for doses up to 100 kGy; it is influenced by the length of the aliphatic chain as well as by the presence of the aromatic ring. Crosslinking dominates for doses between 100 and 300 kGy, while the oxidative degradation mechanism, present at the highest doses, increases its importance with the amorphous fraction of the polymer. Free volume structure is not modified by irradiation.

Effects induced by gamma irradiation of different polyesters studied by viscometry, thermal analysis and positron annihilation spectroscopy. / A. BUTTAFAVA; G.CONSOLATI; M.MARIANI; F.QUASSO; U.RAVASIO. - In: POLYMER DEGRADATION AND STABILITY. - ISSN 0141-3910. - STAMPA. - 89(2005), pp. 133-139.

Effects induced by gamma irradiation of different polyesters studied by viscometry, thermal analysis and positron annihilation spectroscopy.

BUTTAFAVA, ARMANDO;
2005

Abstract

An experimental study on different polyesters (PET, PBT, PEN, PEA, PCT-co-ET) subjected to g-irradiation up to 1 MGy was carried out through viscometry, thermal analysis and positron annihilation lifetime spectroscopy. Chain scission induced by irradiation prevails for doses up to 100 kGy; it is influenced by the length of the aliphatic chain as well as by the presence of the aromatic ring. Crosslinking dominates for doses between 100 and 300 kGy, while the oxidative degradation mechanism, present at the highest doses, increases its importance with the amorphous fraction of the polymer. Free volume structure is not modified by irradiation.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11571/103905
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact