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Crystallization Processes In Poly (Ethylene Terephthalate) / Polycarbonate Blends

Published online by Cambridge University Press:  15 February 2011

Veronika E. Reinsch  and
Ludwig Rebenfeld
Veronika E. Reinsch
Affiliation:
TRI/Princeton, and Department of Chemical Engineering, Princeton University, P.O. Box 625, Princeton, NJ 08542.
Ludwig Rebenfeld
Affiliation:
TRI/Princeton, and Department of Chemical Engineering, Princeton University, P.O. Box 625, Princeton, NJ 08542.
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Abstract

Blends of poly (ethylene terephthalate), or PET, and polycarbonate (PC) over a range of compositions were studied in isothermal crystallizations from the melt using differential scanning calorimetry (DSC). Both crystallization rate and degree of crystallinity of PET depend on blend composition. The glass transition temperature, Tg, of PET and PC in blends and pure polymer were also measured by DSC. Elevation of the Tg of PET and depression of the Tg of PC are observed upon blending. In cooling scans, dynamic crystallization from the melt was observed. In PET/PC blends with high PC content, a novel dual-peak crystallization of PET was observed. The effects of thermal history on crystallization kinetics and degree of crystallinity were also determined in isothermal crystallization studies. For Melt processing times between 1 and 30 Min and for processing temperatures between 280 and 300 °C, Melt processing temperature was seen to have a stronger effect than processing time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 543
Copyright
Copyright © Materials Research Society 1994

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References

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