Aqueous SET-LRP catalyzed with "in situ" generated Cu(0) demonstrates surface mediated activation and bimolecular termination

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C-13 kinetic isotope effects in the copper(I)-mediated living radical polymerization of methyl methacrylate

Carbon-13 kinetic isotope effects (KIEs) have been determined for free-radical and copper-mediated living radical polymerizations of methyl methacrylate at 60 °C. While free-radical polymerization shows only one primary 13C KIE, on the least-substituted double bond carbon (k12/k13 = 1.045), two significant KIEs are observed, one on each double bond carbon, for copper-mediated polymerization (k12/k13(H2C[double bond, length as m-dash]) = 1.050, k12/k13([double bond, length as m-dash]C<) = 1.010), showing that copper-mediated living radical polymerization does not propagate via a simple free radical process

Olefin copolymerization using atom transfer radical polymerization (ATRP) : determination of reactivity ratios

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Olefin copolymerization using atom transfer radical polymerization: Determination of reactivity ratios.

Of the many permutations available for modifying the properties of the polymers, the incorporation of functional groups into an otherwise nonpolar material is substantial. Hence, olefin copolymers of alpha-olefins with polar monomers with various architectures remain an ultimate goal in polyolefin engineering. This paper deals with the comparison of the copolymn. kinetics of Me acrylate and 1-octene, in free radical polymn. (FRP) and atom transfer radical poymerization (ATRP), using online 1H NMR spectroscopy, that results in accurate information on the copolymn. Preliminary detd. reactivity ratios, indicate that there is excellent agreement between values for FRP and ATRP systems. The copolymers of MA &amp; 1-octene, obtained using FRP, have a lower MM as compared to that for a homopolymer of MA using the same technique. Good correlation of the obsd. molar mass with the theor. ones coupled with low polydispersity, point at ordinary ATRP behavior

Olefin copolymerization via controlled radical polymerization : copolymerization of acrylate and 1-octene

The atom transfer radical copolymn. (ATRP) of Me acrylate (MA) with 1-octene was investigated in detail. Well-controlled copolymers contg. almost 25 mol% of 1-octene were obtained using Et 2-bromoisobutyrate (EBriB) as initiator. Narrow molar mass distributions (MMD) were obtained for the ATRP expts. The feasibility of the ATRP copolymns. was independent of the ligand employed. Copolymns. carried out using 4,4'-dinonyl-2,2'-bipyridine (dNbpy) resulted in good control, with significant octene incorporation in the polymer. The lower overall percent conversion obtained for the dNbpy systems as compared to that of the PMDETA systems was attributed to the redox potential of the formed copper(I)-ligand complex. The comparable free radical (co)polymns. (FRP) resulted in broad MMD.An increase in the fraction of the olefin in the monomer feed led to an increase in the level of incorporation of the olefin in the copolymer, at the expense of the overall percent conversion. There was a good agreement between the values of the reactivity ratios detd. for the ATRP and FRP systems. The formation of the copolymer was established using matrix-assisted laser desorption/ionization-time-of-flight-mass spectrometry (MALDI-TOF-MS). From the obtained MALDI-TOF-MS spectra for the ATRP systems, several units of 1-octene were incorporated in the polymer chain, and only one pair of end groups was obsd. On comparison, in the FRP systems, due to the multitude of side reactions occurring, several end groups were obtained. In general, narrow chem. compn. distributions were obtained for the ATRP systems as compared to FR

Synthesis of star-shaped metallo-polymeric chromophores by atom transfer radical polymerization

International audienceThe synthesis of bromoester-functionalized dialkylaminostyryl-2,2′-bipyridyl ligands and of the corresponding tris[dialkylaminostyryl-2,2′-bipyridine] metal(II) complexes are reported (M=Fe, Ru, Zn). These complexes are used as multifunctional metallo-initiators for the atom transfer radical polymerization (ATRP) of methyl methacrylate. The resulting new star-shaped polymers combine the optical (UV-visible and luminescence) properties of the monomers with good processability, which allow to build high optical quality thin films by the spin-coating technique

Design and synthesis of new N-maleimido-functionalized hydrophilic polymers via copper-mediated living radical polymerization: a suitable alternative to PEGylation chemistry,

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Hedge funds and the FSA Feedback statement on DP16

Title from coverAvailable from British Library Document Supply Centre- DSC:m03/21832 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo