| The molecular structure of SSBR5025-2,2564S and 72612S was analyzed,and the in-fluence of the mixer rotor speed on the interaction between high dispersion silica and SSBR,as well as the physical and dynamic mechanical properties of the vulcanizates,were investigated.The results showed that,with the increase of rotor speed,the physical properties of the vulcanizates with different SSBR showed different change trends.The tensile and tear strength of the 72612S were significantly reduced.The wet skid resistance of 5025-2 or 2564S was improved and the rolling resistance was reduced, while the wet skid resistance and the rolling resistance of 72612S showed the best performance as the rotor speed was 80 r·min-1.With the increase of rotor speed,both the G ′ value and ΔG ′(G ′0-G ′100%) of the vulcanizates decreased,the filler dispersion was improved,and the Payne effect decreased.It was also found that the increase of shear effect of 72612S was not as obvious as that of the other two.Under the same rotor speed,compared with that of 5025-2 and 2564S,the ΔG ′of 72612S filled with high dispersion silica was lower,and the dispersion of silica was better. |
