Journal ArticleDOI
Controlled Radical Polymerization of Methacrylic Monomers in the Presence of a Bis(ortho-chelated) Arylnickel(II) Complex and Different Activated Alkyl Halides
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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
2,6-Bis(oxazolinyl)phenylnickel(II) bromide and 2,6-bis(ketimine)phenylnickel(II) bromide: Synthesis, structural features, and redox properties
M. Stol,Dennis J. M. Snelders,Godbole,Remco W. A. Havenith,David M. Haddleton,Guy J. Clarkson,Martin Lutz,Anthony L. Spek,G.P.M. van Klink,G. van Koten +9 more
TL;DR: In this article, the Ni centers have square-planar geometries with a planar, η3-mer-N,C,N' coordination of the terdentate ligand systems, where the nickel center is η1-C bonded to the intra-annular Cipso of the Phebox ligand.
Journal ArticleDOI
Block and star block copolymers by mechanism transformation. VIII Synthesis and characterization of triblock poly(LLA-b-St-b-MMA) by combination of ATRP and ROP
Lei Tao,Bin Luan,Cai-Yuan Pan +2 more
TL;DR: In this paper, block copolymers, poly(LLA- b -St)s and triblock copolymes were synthesized by the combination of the atom transfer radical polymerization (ATRP) with ring-opening polymerization using bifunctional initiator β-hydroxylethyl α-bromoisobyrate (HEBIB) without intermediate function transformation.
Journal ArticleDOI
Copper-based ATRP catalysts of very high activity derived from dimethyl cross-bridged cyclam
Nicolay V. Tsarevsky,Wade A. Braunecker,Wei Tang,Samuel J. Brooks,Krzysztof Matyjaszewski,Gary R. Weisman,Edward H. Wong +6 more
TL;DR: Dimethyl cross-bridged cyclam (DMCBCy) is a very reducing CuI complex that possesses the highest known catalytic activity to date in atom transfer radical polymerization (ATRP) reactions as discussed by the authors.
Journal ArticleDOI
Effect of Ligand Spacer on Silica Gel Supported Atom Transfer Radical Polymerization of Methyl Methacrylate
TL;DR: Silica gels grafted with tetraethyldiethylenetriamine (TEDETA) and di(2-picolyl)amine (DiPA) via poly(ethylene glycol) (PEG) spacers of different chain lengths were synthesized and used as CuBr sup
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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