Abstract
The compatibility behaviour of melt-mixed blends of an amorphous copolyester (PETG) with poly(butylene terephthalate) (PBT) was investigated over the complete composition range. The techniques applied were dynamic mechanical analysis (DMA), DSC, tensile testing, optical and electronic microscopy (SEM). DMA, DSC and large deformation behaviour indicated amorphous component miscibility in quenched blends. Morphology examination corroborated these findings. Composition dependence of PBT crystallinity was in line with the findings reported for other amorphous polyester/PBT blends. The results were rationalized using solubility parameter and mean field theory miscibility predictive schemes.
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