Two Ways To Adjust The Structure Of SBR And Research On Its Reactivity With White Carbon Black By Wet Processing

Two methods were investigated to regulate the microstructure of styrenc-butadiene rubber in anionic polymerization by applying an electric field and adding efficient polar modifier N,N-dimethyltetrahydrofurfurylamine (DMTHFA). We prepared styrene-butadiene rubber with DMTHFA as structure regulator, and silicon tetrachloride was used to terminate the active chain.End-functionized SBR solution mixed with white carbon black in wet process. The products and their vulcanized rubber were respectively characterized by means of GPC, NMR, RPA and micro-controlled electronic universal testing machine, DMTA, SEM, TEM. The main results were as following:DMTHFA could significantly improve the polymerization rate and achieve the random copolymerization of styrene-butadiene. With the raising of [DMTHFA]:(n-BuLi], the relative content of Bv%increased. When [DMTHFA]:[n-BuLi] was up to0.8, relative content of Bv%could be more than60%. The regulation capability of DMTHFA decreased with the increasing of polymerization temperature; the random copolymerization of styrene-butadiene would be improved in the presence of an electric field of only0.9k V/cm.In the Research on performance of vulcanized styrene-butadiene rubber, in the case that the amout of filled white carbon black was below50parts, the dispersion of white carbon black in end-functionalized rubber was better than traditional dry process. Compared with dry process, tensile strength and300%modulus of vulcanized rubber increased, while the elongation at break decreased and wet skid resistance enhanced. Adding Si-69in recipe of rubber processing could further improve wet skid resistance. The residue section of Si-69without crosslinking would improve the plasticity of rubber, so that the Mooney viscosity became lower.