Polyester–polycarbonate blends. II. Poly(ethylene terephthalate)

✍ Scribed by T. R. Nassar; D. R. Paul; J. W. Barlow

• Publisher: John Wiley and Sons
• Year: 1979
• Tongue: English
• Weight: 773 KB
• Volume: 23
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1979.070230108

✦ Synopsis

Melt blends of polycarbonate and poly(ethy1ene terephthalate) were prepared and examined for their transitional behavior by thermal analysis and dynamic mechanical testing. A single T, was observed for compositions containing more than 6%70% P E T by weight while compositions below this range showed two glass transitions. From this it is concluded that PC and P E T are completely miscible in the amorphous phase for PET-rich compositions, whereas PC-rich blends separate into two amorphous phases which apparently contain both components. Melting point and crystallization behavior are consistent with these conclusions and suggest that very little if any interchange reactions occur between the ester and carbonate groups during melt mixing.