Materials Literature
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The tensile strength of skin is associated, in part, with its potential for laceration from impact. The quasi-static tensile strength of skin depends on orientation. The objective of this study was to determine whether the strength of skin in high speed tensile failure experiments exhibits a similar dependence on orie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChelating ability of poly(vinylamine): effects of polyamine structure on chelationShiro Kobayashi, Kyung Do Suh, and Yukio ShirokuraCite this: Macromolecules 1989, 22, 5, 2363–2366Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published ini…
Dielectric and piezoelectric properties of relaxor ferroelectrics in the solid solution, formulated (1−x)(Pb1–1.5yLay)(Mg1/3Nb2/3)—x PbTiO3, have been investigated. The dielectric properties show typical first order ferroelectric behavior for PT ≥ 35% and relaxor type below being indicative of the morphotropic phase b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentaammineruthenium(III) complexes of neutral and anionic (2,3-dichlorophenyl)cyanamide: a spectroscopic analysis of ligand to metal charge-transfer spectraRobert J. Crutchley and Mark L. NaklickiCite this: Inorg. Chem. 1989, 28, 10, 1955–1958Publication Date (Print):May 1,…
Under specific conditions, ceramics can be deposited from gaseous precursors within porous substrates. This technique, referred to as chemical vapor infiltration (CVI) is particularly suited to the preparation of ceramic matrix composites (CMC). Pore filling by CVI results from two simultaneous phenomena : (i) a surfa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel-aluminum alloy as a reducing agentLarry K. Keefer and George LunnCite this: Chem. Rev. 1989, 89, 3, 459–502Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs.acs.org/doi/10.1021/cr00093a002https:/…
The magnetic properties of small BaFe/sub 12/O/sub 19/ particles about 50 nm in size have been studied; the emphasis was on small-size effects. The compound formation of the hexagonal structure was made at a relatively low temperature; the small particle size made this result possible. As compared to the bulk value, a…
Abstract By using an extremely high stereospecific catalyst, three kinds of copolymerizations were carried out with combinations of monomers which differ in the crystallinity of the homopolymers. Addition of a small quantity of comonomer to the homopolymerization systems producing very high crystalline polymers was fo…
The physical background of semiconductor characterization by Raman scattering and some of the technical problems in the Raman microprobe are described. Several significant applications for semiconductors in bulk, thin film, and device configurations are presented.
Abstract We review some of the available evidence to suggest that the oxidation of polypropylene is not a homogeneous process but is localised at several levels. Optical microscopy of oxidised polymer shows regions of high oxidation on the micron scale, sometimes associated with uneven distribution of catalyst residue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface interaction in solvent-cast polystyrene-poly(methyl methacrylate) diblock copolymersPeter F. Green, Thomas M. Christensen, Thomas P. Russell, and Robert JeromeCite this: Macromolecules 1989, 22, 5, 2189–2194Publication Date (Print):May 1, 1989Publication History Publ…
The ultraviolet absorption spectra for polyimide and several polyimide model compounds have been measured and the spectroscopically parametrized CNDO/S3 model is used to provide a detailed quantitative description of the spectra. Analysis of the optical absorption spectrum yields a value of 30° for the phenylimide tor…
We apply the theory of ferroelectricity in the framework of the polarizability model, which has been presented in a previous paper, to various classes of displacive-type ferroelectrics. We show that the experimental data of temperature-dependent quantities like soft-mode frequencies and dielectric constants can be wel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase diagrams for binary polymer systems exhibiting both crystallization and limited liquid-liquid miscibilityW. R. BurghardtCite this: Macromolecules 1989, 22, 5, 2482–2486Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1…
The activity of the amino sugar-synthesizing enzyme L-glutamine:D-fructose-6-phosphate aminotransferase (EC 2.6.1.16) in haploid a cells of Saccharomyces cerevisiae increases 1.7-fold after alpha factor addition. The gene (the gene should be called GFA1 for glutamine:fructose-6-phosphate amidotransferase) for the enzy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical spectroscopy of copper(I)-doped sodium-.beta."-aluminaJ. D. Barrie, B. Dunn, Gary Hollingsworth, and Jeffrey I. ZinkCite this: J. Phys. Chem. 1989, 93, 10, 3958–3963Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1…
Abstract Novel electron acceptors bearing a heteroquinonoid system, 5,5′-bis(dicyanomethylene)-5,5′-dihydro-Δ2,2′-bithiophene, its 3,3′-dichloro, 3,3′-dibromo, and 3,3′,4,4′-tetrabromo derivatives, and 5,5″-bis(dicyanomethylene)5,5″-dihydro-Δ2,2′:5′,2″-terthiophene were synthesized by the action of tetracyanoethylene…
In the framework of the Ginzburg-Landau theory, we derive and discuss the relation RH\ensuremath{\cdot}B=4\ensuremath{\pi}(@${F}_{\mathrm{kin}}$+${2F}_{\mathrm{field}}$-(${12F}_{\mathrm{inhom}}$), which should be useful in numerical calculations of magnetic properties of type-II superconductors.
Abstract Mechanical and rheological properties of blends of a thermotropic liquid crystalline polyester with a polycarbonate have been investigated. The blends are fibrillar in character and exhibit great hardness and toughness due to high degree of molecular orientation which develops during the melt blending and pro…
TEM was used to observe nanoscale microstructural changes which occur over a range of PMN-PT compositions. Increasing PT additions to the PMN-PT solid solution modify ferroelectric and structurally ordered domains. The relevance of nanostructural changes to the corresponding dielectric properties are briefly discussed.