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Copolymers of 1,3-butadiene and p-methylstyrene (p-MS) were synthesized via anionic polymerization. A benzophenone-potassium complex was added to tune the reactivity ratio of the two monomers, leading to random and gradient composition along the copolymer chain. The overall composition and microstructure could be controlled and well characterized by GPC and 1H-NMR. The p-MS was distributed from gradient...
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