we reported the investigation of SBS reinforcd by silicon dioxide-graft-polyisoprene core-shell nanoparticle (SiO
2
-
g
-PIP). First
the hydroxyl on the surface of SiO
2
nanoparticles was reacted with 2-methyl-2-[(dodecylsulfanylthiocarbonyl) sulfanyl] propanoic acid to afford a trithioester-capped SiO
2
(denoted). SiO
2
-CTA used as the nanoparticles chain transfer agent
SiO
2
-
g
-PIP core-shell nanoparticle was synthesized
via
reversible addition-fragmentation chain transfer polymerizations (RAFT). The results of FTIR spectroscopy and TGA showed that the grafting weight of PIP block in SiO
2
-
g
-PIP is 2.1wt%. Then
SiO
2
-
g
-PIP and SiO
2
were simultaneously incorporated into SBS. The results of scanning electron microscope (SEM) showed that SiO
2
microdomains in SBS/SiO
2
-
g
-PIP composite had much better dispersion and distribution than SiO
2
in SBS/SiO
2
composite. It is the filler-rubber interaction of SBS/SiO
2
-
g
-PIP composite that endowed the composite with improved mechanical properties.