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Polar Monomer (polar + monomer)
Selected AbstractsCopolymerization of Ethylene with 2,7-Octadienyl Methyl Ether in the Presence of Metallocene and Nickel Diimine CatalystsMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 7 2009Mércia Fernandes Abstract In this work, copolymers of ethylene with 2,7-octadienyl methyl ether have been synthesized in the presence of three single-site catalysts. The obtained copolymers not only have a polar ether function but also a double bond in the side chains that is useful for secondary reactions. The polymers were characterized by GPC, EA, DSC, NMR, and FT-IR. The catalytic activity depends on the kind of catalysts, the concentration of the polar monomer, and the concentration of the protecting agent. Up to 7.3 wt.-% of MODE could be incorporated by the metallocene catalyst. These are in average 120 functional side groups in a polymer molecule with a molecular mass of 230,000. [source] Synthesis of Poly(lauryl acrylate) by Single-Electron Transfer/Degenerative Chain Transfer Living Radical Polymerization Catalyzed by Na2S2O4 in WaterMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 11 2007Jorge F. J. Coelho Abstract Living radical polymerization of lauryl acrylate was achieved by SET/DTLRP in water catalyzed by sodium dithionite. The work describes the synthesis of a highly hydrophobic and polar monomer in aqueous medium. The plots of versus conversion and ln[M]0/[M] versus time are linear, indicating a controlled polymerization. This method leads to ,,, -diiodopoly(lauryl acrylate)s that can be further functionalized. The MWDs were determined using a combination of three detectors: RALLS, DV, and RI. The method studied in this work represents a possible route to prepare well-tailored macromolecules made of LA in environment friendly reaction medium. The syndiotactic content is 75%. [source] Synthesis of a new salphen-type titanium complex and its application in ethylene polymerization and copolymerizationAPPLIED ORGANOMETALLIC CHEMISTRY, Issue 7 2010Xiaojing Wen Abstract TiCl2[salphen(di- tBu)] was synthesized, characterized and employed as pre-catalyst in ethylene homo- and copolymerization with propylene, 1-octene and 10-undecen-1-ol. X-ray diffraction study on the titanium complex revealed a distorted octahedral coordination of the central metal with a trans -Cl, cis -O, cis -N arrangement. The complex combined with MAO afforded moderate catalytic activities in ethylene polymerization. Furthermore the catalyst not only copolymerized ethylene with apolar monomer (propylene and 1-octene), but also possessed significant capability of incorporation with polar monomer (10-undecen-1-ol). Only single insertion of 1-octene unit in ethylene- co -1-octene polymer was detected by 13C NMR spectrum. Copyright © 2010 John Wiley & Sons, Ltd. [source] Rare-earth-metal-initiated polymerizations of (meth)acrylates and block copolymerizations of olefins with polar monomersJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 12 2001Hajime Yasuda Abstract The organo-rare-earth-metal-initiated living polymerization of methyl methacrylate (MMA) was first discovered in 1992 with (C5Me5)2LnR (where R is H or Me and Ln is Sm, Yb, Y, or La) as an initiator. These polymerizations provided highly syndiotactic (>96%) poly(methyl methacrylate) (PMMA) with a high number-average molecular weight (Mn > 1000 × 103) and a very narrow molecular weight distribution [weight-average molecular weight/number-average molecular weight (Mw/Mn) < 1.04] quantitatively in a short period. Bridged rare-earth-metallocene derivatives were used to perform the block copolymerization of ethylene or 1-hexene with MMA, methyl acrylate, cyclic carbonate, or ,-caprolactone in a voluntary ratio. Highly isotactic (97%), monodisperse, high molecular weight (Mn > 500 × 103, Mw/Mn < 1.1) PMMA was first obtained in 1998 with [(Me3Si)3C]2Yb. Stereocomplexes prepared by the mixing of the resulting syndiotactic and isotactic PMMA revealed improved physical properties. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 1955,1959, 2001 [source] Block copolymerizations of higher 1-olefins with traditional polar monomers using metallocene-type single component lanthanide initiatorsPOLYMER INTERNATIONAL, Issue 8 2004Hajime Yasuda Abstract Block copolymerizations of 1-pentene or 1-hexene with methyl methacrylate or ,-caprolactone were explored using [Me2Si(2-SiMe3 -4- t -BuMe2SiC5H2)2YH]2 (1) or [Me2Si(2-SiMe3 -4- t -BuC5H2)2SmH]2 (2) as an initiator in toluene or in neat mixtures by the successive additions of monomers in this order. Random copolymerizations of 1-pentene with 1-hexene, and random copolymerization of ethylene with 1-hexene were also performed using 1 as an initiator. Copyright © 2004 Society of Chemical Industry [source] | ||||||||||