Rubber Toughening of Reinforced Polyamides

Nevertheless, compared to an unmodified GF-reinforced polyamide, up to a 2-fold increase in notched Izod impact strength can be obtained via the incorporation of a suitable impact modifier, without significantly sacrificing ( 20%) the high modulus and strength. It was found that by blending 10 w% of a 1 1 mixture of a non-reactive rubber (EPR) and a 

It is believed that a bimodal, or a broad distribution of rubber particles resulting from such rubber mixtures, helps in the craze or crack blunting because the larger particles and the small particles provide resistance to crack initiation through increased local shear deformation of the matrix. 

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