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Effectiveness of the Transesterification Catalyst on the Thermal, Dynamic‐Mechanical and Rheological Properties of PET/PC Reactive Melting Blends
Author(s) -
Mendes Luis C.,
Pereira Patrícia S. C.,
Ramos Valéria D.
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200900112
Subject(s) - miscibility , transesterification , materials science , differential scanning calorimetry , polycarbonate , catalysis , dynamic mechanical analysis , polymer blend , melt flow index , rheology , rheometry , ethylene , polymer , chemical engineering , crystallinity , composite material , polymer chemistry , copolymer , organic chemistry , chemistry , physics , engineering , thermodynamics
Reactive poly(ethylene terephthalate) / polycarbonate (PET/PC) melting blends were prepared with different cobalt catalyst and polymer compositions. The presence of catalyst increased the miscibility of the 20/80 (wt%) blend, according to differential scanning calorimetry (DSC) and dynamic‐mechanical analyses (DMA). The catalyst also promoted the amorphisation of the PET chains. Besides, the catalyst caused drastic lowering of both moduli (storage and loss) and melt flow rate (MFR) of some blends. The best mechanical and processing properties were achieved for blends without catalyst, indicating that transesterification reactions prejudice mechanical properties.