Abstract: Two kinds of PP/ABS blend samples were prepared by conventional injection and microinjection moldings, the phase morphology and mechanical properties of the samples were compared by SEM. For the conventional injected samples, when the content of ABS was 40 wt%, the core layer gave rise to a co-continuous structure. When the content of ABS was 50 wt%, it became a dispersed phase of spherical particles. In the skin layer, the dispersed phase deformed seriously. For the microinjected samples, deformed largely caused by high shear rate. Moreover, the cooling was very fast, the morphology in the skin layer remained a co-continuous structure when the content of ABS reached 50 wt%, which was a result of stronger shear. The tensile strength decreased with increasing ABS content, and gave a low value when the co-continuous structure occurred.

Key words: polypropylene, acrylonitrile-butadiene-styrene copolymer, micro-injection molding, blend, Phase morphology