Bv means of the closely intermeshing twin—screw extruder as the reactor and the mixed styrene(S)and butadiene(B)as the monomer

a novel multi—block copolymer(S／B)was synthesized by bulk polymerization with the organic lithium initiator．The PB blocks of eopolymers were cleaved by reaction with hyarogen peroxide in the presence of osmium tetroxide

then the small molecules were removed out of the system by purification It was confirmed by1H—NMR and FTIR

that the double bonds in the molecule chains of the copolymers were fully oxidized

on the other hand

the segments of polystyrene in the molecules of the copolymers were kept intact The segments of polystyrene after oxidization were characterized by GPC cooperating with the multi—angle laser light scartering instrument(MALLS)．It was found that the molecule of the copolymers was made of a segment of polystyrene with Mn of 1×1 04～5×104linking tens of S-B blocks．Cooperated with the survey of TEM photographs

it was confirmed that processing could decide the structure of the polymer molecules．