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Abstract
In this study, poly(ethylene terephthalate)(PET)/poly(ethylene-co-vinyl alcohol) (EVOH) and poly(ethylene terephthalate-co-isophthalate) (PETI)/EVOH (95/5 w/w) blends have been prepared with different types of compatibilizers using a co-rotating intermeshing twin screw extruder. Cast films have been stretched simultaneously and biaxially 2 and 3 times their original dimensions. Scanning electron microscopy, differential scanning calorimetry, oxygen gas and water vapor permeability analyzers have been employed for establishing the relationships among biaxial orientation, crystallinity, morphology, and chemistry on oxygen gas and water vapor permeability. The lowest oxygen gas and water vapor permeability values have been obtained when employed hydroxyl-terminated polybutadiene as the compatibilizer.
ACKNOWLEDGMENT
The author would like to thank TÜBİTAK (The Scientific and Technical Research Council of Turkey) under Grant No. 106M505 for financial support and Artenius UK for providing materials. Travel to University of Akron for stretching experiments was supported by I2CAM NSF Grant No. DMR0645461. The author would also like to thank Dr. Cakmak and his group from Akron University for their kind help.