Study on the structure‐mechanical properties relationship and antistatic characteristics of SSBR composites filled with SiO 2 /CB

The composites of solution polymerized styrene‐butadiene rubber (SSBR) filled with SiO 2 /carbon black (CB) were prepared by reaction blending. The mechanical and antistatic properties were studied. The morphology and dispersion of the two kinds of nano‐fillers in the composites were observed. The results showed that CB presented 30 nm spherical particles and formed filler networks in the SSBR/CB composite. Payne effect of the SSBR/CB composite was large and the antistatic property was excellent; SiO 2 powder presented 20–40 nm irregular particles and also formed filler networks in the SSBR/SiO 2 composite. The internal friction of the SSBR/SiO 2 composite was low, however, the static accumulation was obviously large; SSBR/SiO 2 /CB composites exhibited good filler dispersion, high mechanical properties and low internal friction. The rolling resistance, wet‐skid resistance and wear resistance are well balanced. Among these, the composite filled with SiO 2 /CB in 20/50 achieved the best overall performances. The surface and volume resistivity of the composites was increased with increasing amount of SiO 2 . For the researched formulation, the ratio of SiO 2 /CB in 35/35 was the percolation threshold for the antistatic property of the composites.