The extrudate swell and the dynamic rheological properties of polytbutylene terephthalate) (PBT) and polyamide 6 (PA6) binary blends were investigated at 240°C. The extrudate swell of the blend varies with the viscosity ratio and compe sition of constituents, and it is several times larger than that of homopolymers when the viscosity ratio of constituents is around unity. The dynamic oscillatory data could be interpreted by Oldroyds emulsion model proposed by Graebling, et aL These results suggest that the ex…
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