In this work, graft copolymerization of vinyltriethoxysilane (VTES) onto deproteinized natural rubber (DPNR) was carried out to prepare in situ nanosilica reinforced natural rubber. Graft copolymerization of VTES onto DPNR was performed in latex stage with TBHP/TEPA as initiators with initiator concentrations of , mol/kg-rubber and monomer concentrations of , and mol/kg-rubber. | Graft copolymerization of vinyltriethoxysilane onto deproteinized natural rubber