Impact behaviour of nylon-rubber blends: 5. Influence of the mechanical properties of the elastomer

摘要

Blends of 90wt% nylon-6 and 10wt% impact modifier were prepared. As impact modifiers were used: EPDM (ethylene propylene diene monomer) rubber, EPM (ethylene propylene monomer) rubber, polyethylene, four poly(ether esters) and some commercial impact modifers. EPDM, EPM and polyethylene were functionalized with maleic anhydride. The mechanical properties of the impact modifiers were tested with both a torsion pendulum test and a tensile test. The notched impact strength of the blends was measured as a function of temperature. The relation between the mechanical properties of the elastomer and the impact behaviour of the elastomer-modified nylon-6 was studied while taking into account the effect of the rubber particle size. The type of impact modifier was found to have a strong effect on the impact behaviour of the blend. The rubber particles do not toughen nylon-6 by acting as stress concentrators.