Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/97

TitleRelaxation Behavior of Poly(ethylene terephthalate)/Poly(ethylene naphthalene 2,6-dicarboxylate) Blends Prepared by Cryogenic Blending
Author(s)Denchev, Z.
Ezquerra, T. A.
Nogales, A.
Sics, I.
Álvarez, C.
Broza, G.
Schulte, K.
KeywordsBlends
Copolymerization
Interchange reactions
Poly(ethylene terephthalate) (PET)
Poly(ethylene naphthalene 2,6-dicarboxylate) (PEN)
Dielectric spectroscopy
Differential scanning calorimetry (DSC)
Transesterification
Issue date2002
PublisherWiley
JournalJournal of Polymer Science Part B: Polymer Physics
Citation"Journal of Polymer Science Part B: Polymer Physics". 40:22 (2002) 2570-2578.
Abstract(s)A method including cryogenic grinding, melt pressing from the molten state, and quenching was used to prepare blends of poly(ethylene terephthalate) (PET) and poly(ethylene naphthalene 2,6-dicarboxylate) (PEN) in which the two phases were highly dispersed. The effect of melt-pressing times on the thermal properties and relaxation behavior of PET/PEN films were characterized with differential scanning calorimetry and dielectric spectroscopy. For short melt-pressing times, two glasstransition, two crystallization, and two melting peaks were observed, indicating the presence of PET-rich and PEN rich phases in these blends. Longer melt-pressing times revealed a single glass transition and a single _-relaxation process, showing that PET–PEN block copolymers were likely to be formed during the melt pressing. The experimental findings were examined in terms of the transesterification reactions between the blend components, as revealed by 1H NMR measurements.
TypeArticle
URIhttp://hdl.handle.net/1822/97
DOI10.1002/polb.10320
ISSN0887-6266
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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