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
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Journal ArticleDOI
Mechanistic Aspects of Nitroxide-Mediated Controlled Radical Polymerization of Styrene in Miniemulsion, Using a Water-Soluble Radical Initiator
TL;DR: In this article, Nitroxide-mediated controlled free-radical polymerization of styrene was studied in a miniemulsion system, where the use of an acyclic β-phosphonylated nitroxide enabled polymerization to be performed at a temperature below 100 °C, typically 90 °C.
Journal ArticleDOI
Kinetic Analysis of Controlled/“Living” Radical Polymerizations by Simulations. 1. The Importance of Diffusion-Controlled Reactions
TL;DR: In this article, a simulation of controlled/living atom transfer radical polymerization (ATRP) has been examined through computer simulations and it was found that the peculiar time-dependent rates predicted by the persistent radical effect may not be observed experimentally because termination is dependent on chain length and viscosity.
Journal ArticleDOI
Models for the Initial Stages of Oxidative Addition : Synthesis, Characterization and Mechanistic Investigation of N1-I2 Organometallic 'Pincer' Complexes of Platinum : X-ray Crystal Structures of [Ptl(C6H3{CH2NMe2}2-2,6)(N1-I2)] and exo-meso-[Pt(N1-I3)(N1-I2)(C6H3{CH2N-(t-Bu)Me}2-2,6)
TL;DR: In this paper, the reaction of I2 with platinum "pincer" complexes of the general formula [PtI(NCN)], where NCN = [C6H3(CH2NRR)2-2,6]-; R = R‘ = Me or Et; or R = Me, R' = t-Bu) is reported.
Journal ArticleDOI
Atom Transfer Radical Polymerization of Glycidyl Methacrylate: A Functional Monomer
Pedro Francisco Cañamero,José Luis de la Fuente,Enrique López Madruga,Marta Fernández-García +3 more
TL;DR: A detailed investigation of the polymerization of glycidyl methacrylate (GMA), an epoxy-functional monomer, by atom transfer radical polymerization (ATRP) was performed as discussed by the authors.
Journal ArticleDOI
Low-Temperature Living “Radical” Polymerization (Atom Transfer Polymerization) of Methyl Methacrylate Mediated by Copper(I) N-Alkyl-2-Pyridylmethanimine Complexes
TL;DR: In this paper, the authors demonstrate that atom transfer polymerization of methyl methacrylate mediated by CuBr/N-alkyl-2-pyridylmethanimine complexes in toluene proceeds effectively at temperatures as low as 15 °C.
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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