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A promising ternary copolymer of styrene, isoprene, and butadiene, synthesized by anionic polymerization in solution, was subjected to chemical postpolymerization modifi cation using the following branching and endcapping agents: tin and silicon tetrachlorides, N-methylpyrrolidone, and Michler's ketone. The combined method of chemical modifi cation of the copolymer performed in the two-stream mode (branching and endcapping), with the subsequent mixing of the streams, is the most effi cient.

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