Abstract
Melt-mixed blends of a polyester type polyurethane (PU) with poly(ethylene terephthalate) (PET) were characterized by tensile testing, dynamic mechanical analysis, optical and electronic microscopy and solution 1 H -NMR. Mechanical and thermal properties indicated good blend compatibility typical of a polymeric alloy. Morphology examination revealed good dispersion and strong interface adhesion. 1 H -NMR of blends showed the formation of a PET-PU copolymer by ester–amide interchange reaction whose extent depended on the PET/PU ratio and melt mixing conditions. This in situ formed copolymer is responsible for the reactive compatibilization observed.
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