Abstract
An amorphous random ethylene-propylene rubber (EPR) copolymer and EPR- g-succinic anhydride (EPR- g-SA) graft copolymer have been used as rubbery components to obtain binary polyamide ( PA6) EPR or PA6 EPR-g- SA and ternary PA6/EPR/EPR- g-SA blends by melt mixing. The influence of degree of grafting ( DG) or EPR- g-SA on the morphology and tensile and impact properties of such blends has been investigated. Finer and more homogeneous dispersions of the rubbery domains and better impact properties are obtained with increasing degree of grafting in the blends. At equal DG values and for the compositions used, the binary PA6 EPR-g- SA alloys show better behaviour than the ternary ones. These results are related to the presence of an (EPR- g-SA)- g-PA6 graft copolymer formed during melt mixing, which acts as an interfacial and emulsifying agent.
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