SBR/zinc dimethacrylate/fumed silica nanocomposites

Ternary composites of styrene-butadiene rubber(SBR),fumed silica and zinc dimethacrylate(ZDMA) were prepared.Two kinds of fumed silica,in which U-fumed silica was unmodified fumed silica,M-fumed silica was treated by Si69 coupling agent in our laboratory,were used.The synergistic reinforcement effect between fumed silica and ZDMA was investigated in detail.The results showed that independently addition of same amount of modified fumed silica and unmodified fumed silica caused the different influences on the mechanical properties of the vulcanizates.The effect of M-fumed silica was obviously superior to that of U-fumed silica,but the mechanical properties of the vulcanizates still remained in low values.The obviously synergistic reinforcement of fumed silica and ZDMA to SBR was observed.The measurement of crosslinking density and the acetone extraction experiments indicated that the modification of fumed silica and the addition of ZDMA could all reduce the effect of hydrogen bond of fumed silica.Scanning electron microscopy(SEM) showed that the dispersity of modified fumed silica is improved,at the same time,the addition of ZDMA can improved the dispersity of fumed silica obviously.