Abstract: The bicomponent-grafted polypropylene was prepared by using of a twin-screw extruder; the grafted reaction was characterized by FT-IR.Theinfluence of the content of initiator and monomer on the melt flow rate, meltstrength and anti-sagging ability were studied, and the extrusion foaming was also investigated. Results show that the melt strength and antisasging ability were increased. and the performance of the foam was improved effectively.

Key words: polypropylene； melt grafting, extrusion foaming, melt strength