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Catalytic copolymerization of ethylene with various olefins in solution and in emulsion

The copolymers of ethylene with both, polar and non-polar olefins were obtained in solution and in emulsion catalytic polymerizations, using Niand Pd-based catalysts. Latexes of copolymers of hexadecene or undecenol and ethylene were prepared by emulsion polymerization using a Ni-based catalyst formed in-situ. These latexes may form polymeric films upon evaporation of water. Film adhesion may be improved by introducing undecenol units. Norbomene was copolymerized with ethylene in organic solution and in aqueous emulsion using ill-defined Pd-based sulfonated arylphophine catalytic systems. Norbomene incorporation could be as high as 45 mol. %, leading to copolymers which are altemating. The copolymers with > 15 mol. % of norbomene were suitable for the formation of solvent-based coatings. The resulting films were assessed for anticorrosion properties by EIS after treatment in a Q-Fog chamber. Several well-defined Pd-based catalysts were prepared for the copolymerization of ethylene with polar monomers. Reaction of (2-[bis-(2-methoxy-phenyl)-phosphanyl]-4methyl-benzenesulfonic acid and 2-[bis-(2' ,6' -dimethoxy-biphenyl-2-yl)-phosphanyl]benzenesulfonic acid with dimethyl(N,N,N',N' -tetramethylethylenediamine )-palladium(II), PdMe2(TMEDA) led to the formation of TMEDA bridged palladium based polymerization catalysts. Upon reaction with pyridine, two mononuclear catalysts were isolated. These catalysts were found to homopolymerize ethylene and also copolymerize ethylene with acrylates or with norbomenes. With the ligand 2-[bis-(2' ,6' -dimethoxy-biphenyl-2-yl)-