The stress-strain behavior of different concentrations of low- structure
high abrasion furnace black (HAF-LS)- loaded rubber blend of styrene
butadiene rubber and natural rubber (SBR+NR) of equal parts was measured.
Modulii of elasticity and the n- measure of such blends were calculated using
different approaches. An anomaly, of modulus of elasticity, found at 50 phr may
be attributed either to what is called compact structure and!or to the early
crystallization of natural rubber (NR) in the blend. These assumptions are
confirmed through the measurement of the swelling factor as a function of time
of swelling in kerosene.