Journal ArticleDOI
Controlled Radical Polymerization of Methacrylic Monomers in the Presence of a Bis(ortho-chelated) Arylnickel(II) Complex and Different Activated Alkyl Halides
TLDR
In this article, a novel class of homogeneous nickel(II) catalysts, denoted as Ni(NCN)Br, is reported to mediate in the presence of activated alkyl halides, e.g., CCl4 or α-halocarbonyl compounds, and remarkably enough, poly(methyl methacrylate) (PMMA) with molecular weight up to at least 105 g/mol was synthesized in a controlled fashion.Abstract:
A novel class of homogeneous nickel(II) catalysts, i.e [Ni{o,o‘(CH2NMe2)2C6H3}Br], denoted as Ni(NCN‘)Br, is reported to mediate in the presence of activated alkyl halides, e.g., CCl4 or α-halocarbonyl compounds, a well-controlled radical polymerization of methacrylic monomers [methyl and n-butyl methacrylate), (MMA, n-BuMA)] at rather low temperatures (<100 °C). The number-average molecular weight of the polymer gradually increased with the monomer conversion and was inversely proportional to the initiator concentration of alkyl halides. The molecular weight distribution (MWD) remained very narrow during the whole course of the polymerization (MWD < 1.3). All the experimental data including a successful block copolymerization (n-BuMA-b-MMA) experiment were in agreement with a living polymerization process, and remarkably enough, poly(methyl methacrylate) (PMMA) with molecular weight up to at least 105 g/mol was synthesized in a controlled fashion. Increased thermal stability of the PMMA is a further indi...read more
Citations
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Journal ArticleDOI
Periphery-functionalized organometallic dendrimers for homogeneous catalysis
TL;DR: In this article, the use of carbosilane based dendrimers as molecular scaffolds for the attachment of organomettallic Ni "pincer" complexes that are active as a catalyst in the Kharasch addition reaction is described.
Book ChapterDOI
Living Radical Polymerization
Graeme Moad,David H. Solomon +1 more
TL;DR: In this paper, various approaches have been developed in moving towards a living radical polymerization paying particular attention to the mechanism and the scope of each method, and the kinetics and mechanism of living radical polymers are detailed.
Journal ArticleDOI
Evolution of iron catalysts for effective living radical polymerization: Design of phosphine/halogen Ligands in FeX2(PR3)(2)
Chihiro Uchiike,Takaya Terashima,Makoto Ouchi,Tsuyoshi Ando,Masami Kamigaito,Mitsuo Sawamoto +5 more
TL;DR: In this article, an improved system of iron-complex-catalyzed living radical polymerization of methyl methacrylate (MMA), through design of the ligand, combination of the halogen in the initiator/catalyst, and optimization of the polymerization conditions, was reported.
Journal ArticleDOI
General method for determination of the activation, deactivation, and initiation rate constants in transition metal-catalyzed atom transfer radical processes.
TL;DR: A general method for the determination of the activation, deactivation, and initiation rate constants in atom transfer radical processes is reported, and the determined initiation rate constant was in good agreement with the literature value.
Journal ArticleDOI
Continuous atom transfer radical block copolymerization of methacrylates
Youqing Shen,Shiping Zhu +1 more
TL;DR: In this paper, a column reactor packed with silica-gel-supported copper bromide (CuBr) and hexamethyltriethylenetetramine (HMTETA) was developed for the continuous-transition-metal-mediated living/controlled radical polymerization [atom transfer radical polymerisation (ATRP)] for homo- and block copolymerization of methyl methacrylate (MMA).
References
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Journal ArticleDOI
Controlled/"living" radical polymerization. atom transfer radical polymerization in the presence of transition-metal complexes
Journal ArticleDOI
Polymerization of Methyl Methacrylate with the Carbon Tetrachloride/Dichlorotris- (triphenylphosphine)ruthenium(II)/Methylaluminum Bis(2,6-di-tert-butylphenoxide) Initiating System: Possibility of Living Radical Polymerization
Journal ArticleDOI
Narrow molecular weight resins by a free-radical polymerization process
TL;DR: In this paper, free radical polymerization was used to obtain polystyrene and poly(styrene-co-butadiene) with narrow polydispersity (1.19-1.36) in the presence of 2,2,6, 6,6-tetramethyl-1-piperidinyloxy using benzoyl peroxide as initiator
Journal ArticleDOI
Controlled Living Radical Polymerization - Halogen Atom-Transfer Radical Polymerization Promoted by a Cu(I)Cu(II) Redox Process
TL;DR: An extension of ATRA to atom transfer radical addition, ATRP, provided a new and efficient way to conduct controlled/living radical polymerization as mentioned in this paper, using a simple alkyl halide, R-X (X = Cl and Br), as an initiator and a transition metal species complexed by suitable ligand(s), M t n /L x, e.g., CuX/2,2'-bipyridine, as a catalyst.
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Controlled/"living" radical polymerization. atom transfer radical polymerization in the presence of transition-metal complexes
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