Linear and star liquid butadiene-styrene copolymers(LBSC)with different sequence structure including block LBSC(b-LBSC),transition LBSC(t-LBSC)and random LBSC(r-LBSC)were synthesized by anionic polymerization.The LBSC was epoxidized via in-situ formic acid-hydrogen peroxide method.The effects of hydrogen peroxide amount,reaction temperature and time,relative molecular mass of LBSC,styrene content and sequence structure on epoxy value of epoxidized LBSC(ELBSC)were investigated.The effect of the amount of ELB...