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Rheological study of epoxy systems blended with poly(ether sulfone) of different molecular weights / Yingfeng Yu in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9361–9369 Titre : Rheological study of epoxy systems blended with poly(ether sulfone) of different molecular weights Type de document : texte imprimé Auteurs : Yingfeng Yu, Auteur ; Minghai Wang, Auteur ; David Foix, Auteur Année de publication : 2009 Article en page(s) : p. 9361–9369 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Rheological  study  Epoxy  systems  ether  sulfone Résumé : In this work, the rheological behavior and structural transitions in poly(ether sulfone) (PES)-modified epoxy systems during phase separation were studied by rheometry instrument, scanning electronic microscopy, time-resolved light scattering, and differential scanning calorimetry. The molecular weight and concentration of PES have profound effects on rheological behavior of modified epoxy systems. It was found that the evolution of complex viscosity is closely connected to the molecular weight of PES. Blends with higher molecular weight PES tend to have a lower conversion at the onset of phase separation and show quicker increase of viscosity with curing process. The complex viscosity exhibits an exponential growing process during phase separation at various temperatures. The relaxation time of rheological growth depends on both molecular weight of PES and test frequency. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800845p#afn1 [article] Rheological study of epoxy systems blended with poly(ether sulfone) of different molecular weights [texte imprimé] / Yingfeng Yu, Auteur ; Minghai Wang, Auteur ; David Foix, Auteur . - 2009 . - p. 9361–9369. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9361–9369 Mots-clés : Rheological  study  Epoxy  systems  ether  sulfone Résumé : In this work, the rheological behavior and structural transitions in poly(ether sulfone) (PES)-modified epoxy systems during phase separation were studied by rheometry instrument, scanning electronic microscopy, time-resolved light scattering, and differential scanning calorimetry. The molecular weight and concentration of PES have profound effects on rheological behavior of modified epoxy systems. It was found that the evolution of complex viscosity is closely connected to the molecular weight of PES. Blends with higher molecular weight PES tend to have a lower conversion at the onset of phase separation and show quicker increase of viscosity with curing process. The complex viscosity exhibits an exponential growing process during phase separation at various temperatures. The relaxation time of rheological growth depends on both molecular weight of PES and test frequency. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800845p#afn1