Changes in Properties of PET/PC Blend by Catalyst and Time

The effects of the catalyst and residence time on poly(ethylene terephthalate)/polycarbonate blends (PET/PC) were studied. The T g increased, while the T m decreased with catalyst content and residence time as a consequence of exchange reactions during the processing. The extent of these reactions a...

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Bibliographic Details
Published in:	International journal of polymeric materials Vol. 57; no. 5; pp. 494 - 505
Main Authors:	Pereira, Patricia S. C., Mendes, Luis C., Abrigo, Rosário E. R.
Format:	Journal Article
Language:	English
Published:	Philadelphia, PA Taylor & Francis Group 19-03-2008 Taylor & Francis
Subjects:	Applied sciences cobalt III acetylacetonate Exact sciences and technology flow property Mechanical properties Organic polymers PET/PC reactive blending phase behavior Physicochemistry of polymers Properties and characterization Ethylene terephthalate polymer Elastic modulus Mixing Catalytic reaction Polymer blends Ester polymer Mechanical properties flow property Cobalt III Compounds Crystallinity Transesterification Experimental study Melt index cobalt III acetylacetonate Heterogeneous mixture Thermal stability Thermal properties PET/PC reactive blending phase behavior Impact strength Concentration effect Polycarbonate Rheological properties
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Summary:	The effects of the catalyst and residence time on poly(ethylene terephthalate)/polycarbonate blends (PET/PC) were studied. The T g increased, while the T m decreased with catalyst content and residence time as a consequence of exchange reactions during the processing. The extent of these reactions also influenced the crystal size of PET. Additionally, impact and tension properties were influenced by the level of transesterification reactions. The best value of impact was 89,7 ± 0,9 J · m for the PET/PC blend which contained 75 × 10 −3 wt% of catalyst and 10 min of residence time, which represents a fourfold increase over the neat PET. Concerning elastic modulus, the best value was 60% higher than plain PET due to a higher amount of PC chains inserted in the PET. The melt flow index showed that the presence of PC enhanced the thermal stability of PET due to the formation of PET/PC copolymers.
ISSN:	0091-4037 1563-535X
DOI:	10.1080/00914030701816045