title: Efficient and robust star polymer catalysts for living radical polymerization: cooperative activation in microgel-core reactors.
abstract: Multifunctional microgel-core star polymers with ruthenium catalysts are designed as catalyst-bearing nanoreactors to improve activity, controllability, and functionality tolerance in living radical polymerization. Multifunctional ligands are efficiently incorporated into the core of star polymers by sequential tandem procedures: 1) ruthenium-catalyzed living radical polymerization, 2) in situ core hydrogenation, and 3) core-ruthenium removal. Typically, the star polymer ligands comprising multiple phosphines and amines within the core cooperatively enclose a ruthenium complex (>100 per core). As a result, the in-core pseudo hetero P,N-chelation of the ruthenium complexes not only showed high activity for methyl methacrylate but also high tolerance to unprotected methacrylic acid.
authors.affiliation: Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan. terashima@living.polym.kyoto-u.ac.jp
authors.forename: Takaya
authors.initials: T
authors.lastname: Terashima
authors.forename: Akihisa
authors.initials: A
authors.lastname: Nomura
authors.forename: Makoto
authors.initials: M
authors.lastname: Ouchi
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Sawamoto
mesh_terms: D002384:Catalysis; D056831:Coordination Complexes / Q000737:chemistry*; D005609:Free Radicals / Q000737:chemistry; D006865:Hydrogenation; D007700:Kinetics; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000138:chemical synthesis*; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D017975:Ruthenium Compounds / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D005609:Free Radicals; D011109:Polymethacrylic Acids; D017975:Ruthenium Compounds; D019904:Polymethyl Methacrylate; C038365:ruthenium chloride