Synthesis and Properties of Vinyl Silane Grafted Styrene Butadiene Rubber through Atom Transfer Radical Polymerization in Latex

A new well controllable vinyl silane grafted styrene butadiene rubber (SBR) was firstly prepared by tom transfer radical polymerization (ATRP) in the latex stage. The brominated SBR (SBR-Br) was prepared by the reaction between the SBR and N-bromosuccinimide(NBS), then silane grafted SBR with well-controlled branch chain was created by the ATRP of silane initiated by SBR-Br in the presence of CuBr/dNbpy. The best grafting condition was obtained, that is the reaction temperature and time were 70°C and 12 h, the mass ratio of monomer: CuBr:dNbpy was 3 : 0.02 : 0.01. The SBR-Br and grafted SBR were characterized by ATR-FTIR and ¹ H-NMR spectra technique. The reaction kinetics study proved that the process of grafting reaction had active/controllable characteristics. Compared with the native SBR, the AFM results showed that the grafted SBR showed significant phase separation, the TEM images clearly showed that the emulsion particles have a uniform core-shell structure, the tensile strength of vinyltrimethylsilane grafted SBR (SBR-g-VTS) and γ-methacryloxypropyltrimethoxysilane grafted SBR SBR-g-MPS were increased by 2.66 and 2.23 times, respectively.