Hydrophobic silica coated with 1,2-polybutadiene(Silica-PBs)was prepared using thiol-ene click method.Infrared spectroscopy and X-ray photoelectron spectroscopy analysis confirmed that the surface of Silica-PBs was coated with 1,2-polybutadiene with excess vinyl groups.The vulca-nized rubber prepared by blending Silica-PBs with styrene-butadiene rubber(SBR)exhibited superior comprehensive properties compared to vulcanizate modified with silane coupling agents.Rubber pro-cessing analyzer and electron microscopy analysis demonstrated that Silica-PBs exhibited better dispersion in SBR,and could form"buffer zone"be-tween the filler and rubber molecular chain,provi-ding a certain buffering effect when the filler slipped within the rubber molecular chain.Dynamic me-chanical properties tests indicated that Silica-PBs improved the dynamic mechanical properties of SBR/Silica-PBs composites by more than 8％compared to traditional silica,and could be used as an ideal filler for green tires.
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