The mixing of the ingredients was done on a two-roll mill
(16 33cm2) according to ASTM D 3184-11at a friction ratio of
1:1.22 [22]. The temperature of the rolls was maintained at
70 ± 5 C. At first 60 g NR was masticated for a while and then it
was blended with the graft copolymer of NR and EPS already prepared
in Brabender Plasticorder so that a final 95/5 NR/EPS blend
was obtained