Successive synthesis of well-defined multiarmed miktoarm star polymers by iterative methodology using living anionic polymerization

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AbstractThe synthesis of miktoarm star (μ-star) polymers by the methodologies based on living anionic polymerization is reviewed, with a particular focus on precisely controlled architectures of the synthesized μ-star polymers, such as molecular weight, molecular weight distribution, arm number, and composition. Among these methodologies, a novel and versatile stepwise “iterative methodology” recently developed by us is mainly introduced in this article. The iterative methodology is designed in a way that the same reaction site is regenerated after the arm introduction in each reaction sequence and this sequence is repeatable. The development of this methodology allows successive and, in principle, limitless introduction of arm segment into μ-star polymers. Consequently, a variety of new and synthetically very difficult multi-armed and multi-component μ-star polymers with well-defined architectures have been synthesized. They were composed of polyisoprene, poly(styrene)s, poly(2-vinylpyridine), poly(methyl methacrylate), various methacrylate-based polymers, and even poly(acetylene) as arm segments.

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