Abstract: In order to improve the stability of polypropylene (PP) in electron beam, irganox 1010, irganox 1076, tinuvin 770, and chimassorb 944 were introduced as stabilizers. DSC, TG, SEM analysis, mechanical property and color test were carried out. It showed that the tinuvin 770 at 0.5 phr provided the lowest yellow index; the join of antioxidant and light stabilizer after irradiation could improve the crystallinity, reduce thermal gravimetric epitaxial starting temperature, decrease the tensile strength and elongation rate, increase the impact strength, and sections of the composite show ductile failure.

Key words: Polypropylene, antioxidant, light stabilizer, radiation induced color