| 摘要 |
The present invention provides a multi-branched block copolymer of vinyl aromatic monomer and conjugated diene having a structure of general formula (S-D)m-R-D, where S represents a polymer of aromatic monomer, D represents a polymer of conjugated-diene monomer, R represents a conjugated diene copolymer containing randomly multi-placed condensing agents (Cn), in which C represents a condensing agent with following formula 1 and n represents the number of condensing agents. Further, condensing agent has a dual functionality for propagation and termination of polymerization. The multi-branched styrene-conjugated diene block copolymer has enhanced tensile strength and low solution viscosity compared to radial type block copolymer. Preparation process for these multi-branched block copolymer is also provided.
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