Abstract
The compatibility behaviour of melt-mixed blends of an amorphous copolyester poly(ethylene- co-cycloexane 1,4-dimethanol terephthalate) (PETG), with bisphenol-A polycarbonate (PC) was investigated over the complete composition range. The techniques applied were dynamic mechanical analysis (DMA), tensile testing, optical and electron microscopy and FT-IR spectroscopy. DMA data indicated a nearly miscible polymeric alloy and these results are in line with the tensile properties obtained and the morphology examination of films and cryo-fractured surfaces. Analysis of the shifts of the main viscoelastic transitions (caused by the partial component mixing), using available theory, allowed the determination of the χ 12 polymer–polymer interaction parameter and its critical value χ c characterizing the phase stability of the blend.
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