Abstract: In this paper, a series of reactive compatibilizer—ethylene propylene terpolymer (EPT) graft copolymer (EPT-g-ITA and EPT-g-MAH) were prepared successfully via solution grafting. By means of FT-IR analysis, it was proved that the grafted monomer ITA and MAH have been grafted onto EPT backbone, respectively. The effects of the dosage of grafted monomer and initiator on the graft ratio and gel content of graft copolymer were investigated. The graft ratio of EPT-g-ITA reached to 3.16 % and gel content was 8.8% when EPT︰ITA︰BPO = 100︰20︰4; The graft ratio of EPT-g-MAH reached to 3.58 % and gel content was 6% when EPT︰MAH︰BPO = 100︰8︰0.64. EPT graft copolymer was introduced into PA6/EPT blend system through twin screw extruder, the impact strength of PA6/EPT/EPT-g-MAH blends containing 15% of EPT-g-MAH was 20 times higher than neat PA6. By analyzing the graft ratio, gel content and notched impact strength of PA6 alloy, it was defined that MAH branched chain grafted onto EPT backbone is shorter and the grafting point is more, but ITA branched chain grafted onto EPT backbone is longer and the grafting point was less.

Key words: ethylene propylene graft terpolymer, solution grafting, malefic anhydride, itaconic acid, compatibility