Literature gives only general information about SBS copolymer formed by two-stage synthetic process using mono-functional group alkyl lithium as initiator. The present article studies preliminarily the structure and properties of SBS by two-stage synthetic process using cyclohexane as solvent

n-BuLi as initiator and THF as additive. Results show when the middle block styrene content is controlled at around 8%

the properties of the copolymer is superior than those given in literature and similar to the Shell products Cariflex TR-1101.