Abstract: Blends of poly（trimethylene terephthalate）/acrylonitrile-styrene-acrylic copolymer were prepared through melt extrusion. The morphology, rheology, thermal aging, and mechanical properties of the blends were investigated using the scanning electrole microscopy, universal material testing machine, and a capillary rheometer. It was found that ASA and PTT were partially miscible in the blends. When ASA content was 50 %, a binary continuous phase formed. The blend’s fracture surface became rough with increasing ASA content. ASA component improved the impact strength but depressed the tensile strength of the blends. The apparent viscosity increased with increasing ASA content and the latter improved the processing property of the blends. The blend’s pseudoplasticity increased with increasing ASA content. Moreover, PTT/ASA blend had better thermal aging resistance than that of PTT/ASA blend.

Key words: poly(trimethylene terephthalate), acrylonitrile-styrene-acrylate copolymer, phase morphology, rheology, thermal aging