Author
Elizabeth Forrester Mccord
Other affiliations: University of Akron, DuPont Central Research, Ohio State University ...read more
Bio: Elizabeth Forrester Mccord is an academic researcher from DuPont. The author has contributed to research in topics: Nuclear magnetic resonance spectroscopy & Two-dimensional nuclear magnetic resonance spectroscopy. The author has an hindex of 23, co-authored 65 publications receiving 2738 citations. Previous affiliations of Elizabeth Forrester Mccord include University of Akron & DuPont Central Research.
Papers published on a yearly basis
Papers
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TL;DR: Although the overall branching number and the distribution of short-chain branching change very slightly, the architecture or topology of the polyethylene changes from linearpolyethylene with moderate branches at high ethylene pressures to a hyperbranched polyethylenes at low pressures.
Abstract: Ethylene pressure has been used to control the competition between isomerization (chain walking) and monomer insertion processes for ethylene coordination polymerization catalyzed by a palladium-α-diimine catalyst. The topology of the polyethylene varies from linear with moderate branching to “hyperbranched” structures. Although the overall branching number and the distribution of short-chain branching change very slightly, the architecture or topology of the polyethylene changes from linear polyethylene with moderate branches at high ethylene pressures to a hyperbranched polyethylene at low pressures.
610 citations
TL;DR: Inactivation of the peroxisome biogenesis gene PEX10 was crucial in obtaining high EPA yields and may increase the yields of other commercially desirable lipid-related products and provides a sustainable source of EPA.
Abstract: Metabolic engineering of the oleaginous yeast Yarrowia lipolytica greatly enhances yields of omega-3 eicosapentaenoic acid.
447 citations
Patent•
24 Jan 1996TL;DR: In this paper, processes for polymerizing ethylene, acyclic olefins, a nd/or selected cyclic OLEFins, and optionally selected o lefinic esters or carboxylic acids, and other monomers are discussed.
Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, a nd/or selected cyclic olefins, and optionally selected o lefinic esters or carboxylic acids, and other monomers. The polymerizations are cata lysed by selected transition metal compounds, and someti mes other co-catalysts. Since some of the polymerizations exhibit some character istics of living polymerizations, block copolymers can b e readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of the m unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc. Also described here in is the synthesis of linear .alpha.-olefins by the oli gomerization of ethylene using as a catalyst system a combination of a nickel compound ha ving a selected .alpha.-diimine ligand and a selected Le wis or Bronsted acid, or by contacting selected $(a)-diimine nickel complexes with ethylene.
339 citations
TL;DR: In this article, a group of polyethylenes synthesized using palladium α-diimine catalysts were studied using 13C NMR spectroscopy, intensity light scattering, dynamic light scattering and viscometry.
Abstract: A group of polyethylenes synthesized using palladium α-diimine catalysts were studied using 13C NMR spectroscopy, intensity light scattering, dynamic light scattering, and viscometry. These catalysts are known to produce branched polyethylenes without α-olefin comonomers. The series of polymers studied were synthesized under conditions of varying ethylene pressure. The polymers are highly branched and completely amorphous and are thus soluble in common organic solvents at ambient temperatures. Light scattering determinations of the root-mean-square radius of gyration (Rg) and the molecular weight M of fractions eluting from a size exclusion chromatograph demonstrated that, at a given M, Rg decreased as ethylene pressure decreased. The hydrodynamic parametersthe Stokes radius (RH) from dynamic light scattering and the intrinsic viscosity ([η])also decreased. The change in Rg at a constant M results from the change in branching topology for the polymers synthesized at different ethylene pressures. The param...
183 citations
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2,770 citations
TL;DR: In this article, the authors propose a method for the identification of the most likely candidate species of a given species from a set of known species: a.k.a. a. nomenclature.
1,466 citations
TL;DR: A review of the catalytic activity of metal complexes of binaphthyl compounds and their combinations with salen Schiff base is presented in this paper, where the pyridyl bis (imide) and pyridine bis(imine) complexes of cobalt(II), iron(II) ions have been used as catalysts in the polymerization of ethylene and propylene.
1,237 citations
1,124 citations
TL;DR: A review of the historical roles that quantized building blocks such as atoms and monomers have played in the development of small molecule and traditional polymer synthesis, respectively, is presented in this article, where the unique features of traditional macromolecular architectures (i.e. linear, crosslinked, branched), as well as controlled nanostructures in biology were used as frames of reference to anticipate potential new properties, phenomena and synthetic constructs that should be expected to emerge at the interface of the dendritic architectural state.
1,037 citations