Role of Rubber Particle Size on Polyamide Toughness

1 Role of Rubber Particle Size on Polyamide Toughness 

It has been well recognized from the various studies, as indieated above, that for effective toughening, the concentration of rubber should be above a critical level, which in turn depends on the rubber particle size. Combining these two independent parameters into a single parameter, Wu proposed the concept of critical surface-to-surface inter-particle distance (r), also termed as the critical matrix ligament thickness , as the single key 

Thus the rubber particle size, distribution, and inter-particle distance are all veiy important parameters related to the impact toughness. Borggreve et al. [50] also found that the ductile-brittle transition of the polyamide blend is shifted to low temperature, by choosing a low Tg, low modulus rubber, as well as controlling the rubber particle size ( 1 pm) and volume fraction. 

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