Abstract: In this paper, a series of ethylene-octene copolymer graft (POE-g-ITA) was prepared via melt grafting technique using a twin screw extruder. The grafted product was characterized uisng FT-IR，and the effect of the loading of itaconic acid initiator on the graft ratio and melt flow rate of POE-g-ITA were studied. The graft ratio of POE-g-ITA reached 1.36% when POE/ITA/DCP is 94/6/0.36. The obtained POE-g-ITA was introduced into PA6/POE blends through twin screw extruder. The mechanical properties and morphological structure of the blends were investigated. The impact strength of the PA6/POE blend containing 5 phr POE-g-ITA was 12.78 times higher than neat PA 6. The interface between PA 6 and POE phases became indistinct and the dispersion phase size significantly reduced, the interface interaction was markedly enhanced and the compatibility was significantly increased.

Key words: morphological structure, polyamide 6, ethylene-octene copolymer, itaconic acid, mechanical properties