Properties of Poly(Ethylene Terephthalate)/Poly(Ethylene Naphthalate) Blends.

Blends composed of poly(ethylene terephthalate) (PET) as the majority component and poly(ethylene naphthalate)(PEN) as the minority component were melt-mixed in a single screw extruder at various PET/PEN compound ratios. Tensile and flexural test results reveal a good PET/PEN composition dependence, indicating that the compatibility of the blends is effective in a macrodomain. In thermal tests, single transitions for [T.sub.g]' [T.sub.m] and [T.sub.c] (crystallization temperature), respectively, are observed from DSC as well as single [T.sub.g] from DMA except for 50/50 blends. Th