Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTForces between two adsorbed poly(ethylene oxide) layers in a good aqueous solvent in the range 0-150 nmJacob Klein and Paul F. LuckhamCite this: Macromolecules 1984, 17, 5, 1041–1048Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published i…
The continuous sequence of 2.3 kilobases in a 3-kilobase DNA fragment encoding the structural gene for coliphage T4 thymidylate synthase (5,10-methylenetetrahydrofolate:dUMP C-methyltransferase, EC 2.1.1.45) was determined by using the M13 dideoxy chain-termination method. From the coding information within this gene…
We model, in an elementary way, the excited electronic states of semiconductor crystallites sufficiently small (∼50 Å diam) that the electronic properties differ from those of bulk materials. In this limit the excited states and ionization processes assume a molecular-like character. However, diffraction of bonding el…
Abstract The natural HFA soaps present in ammoniated NR latex concentrates are derived from the hydrolysis of the saponifiable lipids on the surfaces of the latex particles. A method based on cold extraction of the soaps has been developed for determining the natural HFA soaps in freshly concentrated latices. This met…
Abstract In a new, one‐step synthesis, polyglycolide was prepared by the reaction of bromo‐ or chloroacetic acid with triethylamine in a nitromethane solution. It was discolored, by iodoacetic acid possibly as a result of iodine formed by the decomposition of triethylammonium iodide. The structure of polyglycolide was…
The preparation, magnetic and thermal properties, electronic and infrared spectra, and molecular structure of poly-bis(μ-di-n-hexylphosphinato)copper(II) are described. Crystals of the compound are triclinic, a = 9.800(3), b = 12.336(6), c = 13.352(8) Å, α = 88.53(3), β = 74.02(4), γ = 82.33(3)°, Z = 2, space group [F…
Abstract By the use of a perfectly mixed model and an imperfectly mixed one for lowdensity polyethylene vessel reactors, we show that increases in the initiator consumption with polymerization temperature are due to mixing limitations at the initiator feed. With all its parameters independently estimated, the imperfec…
A propagating buckle can be initiated in tubes under external pressure from localized imperfections. Once initiated a buckle will propagate with the result of flattening the tube behind it. The lowest pressure at which it can propagate is known as the propagation pressure, and it represents a characteristic pressure o…
We extend Fixman’s self-consistent phonon theory of the thermodynamic properties and fluctuations of the hard sphere crystal to an amorphous lattice. In doing so we develop a theory of lattice vibrations in amorphous materials via a perturbation theory around the Einstein oscillator approximation. This development is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of nitroso compounds: relative ionicity of the closed and open formsC. D. Batich and D. S. DonaldCite this: J. Am. Chem. Soc. 1984, 106, 10, 2758–2761Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published…
The appropriateness of the National Defense Research Council (NDRC) equations for penetration and back‐face scabbing thicknesses are reevaluated using presently available test results. A nondimensional impact factor is introduced to improve the predictability of these equations. Penetration depths are estimated using…
It is generally accepted that sulfide stress cracking (SSC) failures are the result of hydrogen embrittlement. However, the evidence heretofore has been mostly circumstantial. The purpose of this paper is to provide the experimental evidence which establishes the causality of hydrogen and the contributory roles of H2S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and structural characterization of nitrosyl complexes of ferric porphyrinates. Molecular structure of aquonitrosyl(meso-tetraphenylporphinato)iron(III) perchlorate and nitrosyl(octaethylporphinato)iron(III) perchlorateW. Robert Scheidt, Young Ja Lee, and Keiichir…
A RATIO method has been developed to extract physical structure information from anisotropic thin organic films on metal substrates using reflection absorption infrared spectroscopy (RAIR). The physical structure information referred to are the Euler angles, θ and ψ, specifying the molecular orientation relative to th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganoactinide phosphine/phosphite coordination chemistry. Facile hydride-induced dealkoxylation and the formation of actinide phosphinidene complexesMichael R. Duttera, Victor W. Day, and Tobin J. MarksCite this: J. Am. Chem. Soc. 1984, 106, 10, 2907–2912Publication Date (P…
The effective viscosity of a suspension is defined to be the four-tensor that relates the average deviatoric stress to the average rate of strain. We determine the effective viscosity of an array of spheres centred on the points of a periodic lattice in an incompressible Newtonian fluid. The formulation involves the t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-bound substrates: a method to distinguish between homogeneous and heterogeneous catalysisJ. P. Collman, K. M. Kosydar, M. Bressan, W. Lamanna, and T. GarrettCite this: J. Am. Chem. Soc. 1984, 106, 9, 2569–2579Publication Date (Print):May 1, 1984Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR of silk fibroin. Carbon-13 NMR study of the chain dynamics and solution structure of Bombyx mori silk fibroinTetsuo Asakura, Yasuo Watanabe, Akane Uchida, and Hidenobu MinagawaCite this: Macromolecules 1984, 17, 5, 1075–1081Publication Date (Print):May 1, 1984Publication…
A technique was developed to study moisture transport and to determine the mechanism by which moisture is transported between fabrics under transient conditions at low moisture contents. A variety of fabrics were tested and experiments were performed at various levels of moisture content from 3% to over 100% above reg…
Renewed interest in metallic fuels for liquid-metal fast breeder reactors (LMFBRs) has arisen for several reasons: The excellent performance demonstrated by metallic fuel, particularly at Experimental Breeder Reactor II; the demonstrated transient capability; the inherent compatibility with the sodium coolant; and the…