| abstract |
The present invention relates to a star block copolymer having the following structure and the preparing method thereof: (X-Y)-C, wherein X is a random copolymer block of conjugated diene monomer and monovinyl aromatic hydrocarbon monomer, Y is a conjugated diene polymer block, C is the residue of polyfunctional lithium initiator, n is the functionality of the initiator and is equal to or greater then 3. In a single molecule, the star block copolymer of the present invention has random copolymer block of conjugated diene monomer and monovinyl aromatic hydrocarbon monomer, and at the same time rubbery block selected from conjugated diene homopolymer block, conjugated diene tapered copolymer block, conjugated diene random copolymer block or the combination thereof. Therefore, such kind of block copolymer has excellent properties of both kinds of rubbers described above, and can be widely used as elastomers. |