Materials Literature
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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…
Thermal transport properties of a series of polyester, cotton, and polyester/cotton blend fabrics were determined in an effort to understand physical basis of clothing comfort. The results indicate that both the fabric construction and the constituent fiber properties affect thermal transport. In general, thermal insu…
Abstract The electrical resistivity of crosslinked high‐density polyethylene loaded with conductive blacks and carbon fibers was studied as a function of filler concentration and temperature. A thermoelectric switching phenomenon (a sudden resistivity increase in the vicinity of the polyethylene melting point) in such…
Elastic constants of single crystals of yttria‐stabilized zirconia were determined through the temperature range 20° to 700°C. Crystals containing 8.1, 11.1,12.1, 15.5, and 17.9 mol% Y 2 0 3 were measured. The elastic constant C 11 was found to decrease and C 12 and C 44 to increase with increasing Y 2 O 3 content; th…
Abstract Crystallization of polypropylene (PP) in the blends of PP with styrene–ethylene butylene–styrene triblock copolymer (SEBS) is studied through differential thermal analysis (DTA) and X‐ray diffraction measurements. Analysis of crystallization exotherm peaks in terms of crystallization nucleation and growth rat…
A density functional model, based on the coarse grained density distribution is used to analyse the melting of hard spheres and discs. The role of the attractive interaction is modelled in a mean field approximation, to get the full solid-liquid-vapour phase diagram of a system with Lennard-Jones interactions.
Dielectric properties are reported for lead magnesium niobate (PbMg 1/3 Nb 2/3 /O 3 ) ceramics which were prepared as single phase (i.e., without pyrochlore) with an improved technique. Dielectric constants of 18000 for pure PMN and 31000 for PMN with 10% PbTiO 3 were achieved; these values are 50% larger than those r…