Thermal characterization of polymer blends prepared by reactive blending of PC and PET

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:602868

Fiorini, M; Marchese, P ^[1]; Pilati, F ^[2]

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1. Univ. of Bologna (Italy)
2. Univ. of Modena (Italy); and others

Several Poly(ethylene terephthalate)-Bisphenol A polycarbonate (PC/PET) blends were prepared by reactive blending poly(ethylene terephthalate) and Bisphenol A polycarbonate in a batch mixer in the presence of ester exchange catalysts with different catalytic activity, such as Titanium, Terbium, Cerium, Samarium, Europium and Calcium/Antimony compounds. The catalytic activity and mixing time have been correlated with the extent of ester-carbonate exchange reactions and hence the influence of the PET/PC block copolymers formed during the blending on miscibility has been investigated by differential scanning calorimetry. The results of the thermal characterization showed that blends with a single glass transition temperature can be prepared at different mixing time determined by the ester-carbonate exchange reaction activity of the different catalysts employed. In addition, the Tg`s values for the miscible blends were lower than those predicted by the widely used Flory-Fox equation, except from the blends prepared with the Titanium catalyst. Crystallization of PET in PC/PET blends was also investigated. Thermal analysis is a powerful technique that can be applied to the determination of miscibility in polymer blends. In this communication, the results of a differential scanning calorimetry (DSC) study on blends prepared by reactive blending PC and PET are reported.

• OSTI ID: 602868
• Report Number(s): CONF-961108--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATALYSTS
COPOLYMERS
CRYSTALLIZATION
MIXTURES
POLYCARBONATES
POLYESTERS
PROCESSING
THERMAL ANALYSIS
TIME DEPENDENCE
TRANSITION TEMPERATURE