General Study On System In Solution Integral Rubber SIBR

The integral rubber SEBR has excellent comprehensive,the anionic solution terpolymerizations of Styrene(St),Isoprene(I) and Butadiene(Bd) with TMEDA/n-BuLi are investigated by batch reactor operation. Because of the complication of terpolymerization, a new method was adopted to study it that is Bd, I and St were homopolymerizated separately,and then Bd, I and St were dipolymerizated with each other ;at last Bd, I and St were terpolymerizated ,the laws and data of polymerization rate ,composition and microstructure were used to study and explain terpolymerization, and the results are satisfactory.In the homopolymerization ofI,without additive the initiation rate of the polymerization is slow, and the introduction of additive can accelerate it With the increasing of TMEDA/Li, polyme-rization rate of I decreases. Beyond the ratio of 1.0, the reaction rate of I changes very little..In the dipolymerization, with the increasing of TMEDA/Li, the dipolymerization rate of I and St decreases; the dipolymerization rate of I and Bd increases; the dipolymerization rate of Bd and St increases and approaches a maximum value when TMEDA/Li is around 1.0 then decreases Each monomer reactivity ratio (rB )dipolymerization is obtained by advanced TM method. With the increasing of TMEDA/Li: In dipolymerization of I and St, rI decreases; rSt increases ;after TMEDA/Li 0.8, rSt overflows rI. In the dipolymerization of I and Bd, rBd increases; rI decreases; TMEDA/Li has no effect on rBd and rI after TMEDA/Li 0.8.In the dipolymerization of Bd and St, rBd decreases; rSt increases. The composition of each dipotymer was calculated and shows:In the dipolymerization of St and I, randomness is better when TMEDA/Li is between 0.5 and 1.0; in the dipolymerization of I and Bd, when there is no additive, rI,