Silane coupling agent 3-aminopropyltriethoxysilane modified silica/epoxidized solution-polymerized styrene butadiene rubber nanocomposites

In this paper, epoxidized solution-polymerized styrene butadiene rubber (ESSBR) as the matrix and silica as filler, a small quantity of 3-aminopropyltriethoxysilane (APTES) is used to adjust the cross-linking network of ESSBR/silica. The effect of two APTES addition methods (ESSBR/APTES/silica and ESSBR/silica/APTES) on the nanocomposite properties is investigated. The epoxy groups of ESSBR and the ethoxy groups of APTES can react with the hydroxyl groups on silica to improve dispersion. At the same time, the amino groups at another end of APTES can react with the epoxy groups of ESSBR to increase the cross-linking density. Compared with bis(3-triethoxysilylpropyl) disulfide (TESPD) modified SSBR/silica (SSBR/TESPD/silica), ESSBR/APTES/silica shows 133% improvement in wet-skid resistance, 14% reduction in rolling resistance with less silane coupling agent and volatile organic compounds emissions. ESSBR/APTES/silica has excellent overall performance and offers a good prospect for the preparation of green tire tread. Highlights: APTES modified silica/ESSBR nanocomposites are prepared. Epoxy groups and APTES react with silica to improve dispersion. APTES can increase the cross-linking density. The nanocomposite has excellent comprehensive performance as green tire tread. The nanocomposite has less silane coupling agent and VOCs emission.