Materials Literature
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The static polarization of lead magnesium niobate has been studied using a standard Sawyer-Tower circuit. The square-to-slim-loop hysteresis transition was phenomenologically modeled by modifying N\'eel's equation for the magnetization of a superparamagnet to a similar relationship for a superparaelectric. A temperatu…
Abstract A general analysis of the steps of the Rothemund reaction, allowed for a better understanding and a significant improvement of this reaction as a synthetic method in some of the previously known difficult syntheses.
Many-body, long-range potentials of a Finnis-Sinclair type are formulated for the atomistic description of binary f.c.c. metallic alloys. These potentials are generalizations of the scheme constructed by Sutton and Chen (1990), for the atomistic modelling of f.c.c. elemental metals. The parameters for the alloy potent…
A detailed set of measurements is presented on determining the emission and absorption cross sections of Er/sup 3+/ doped fibers for the /sup 4/I/sub 13/2/ to /sup 4/I/sub 15/2/ transition. Two techniques are employed: the Fuchtbauer-Ladenberg analysis, based on spectroscopic data, and a more direct technique involvin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetostructural correlations in magnetically coupled (.mu.-oxo)diiron(III) complexesSergiu M. Gorun and Stephen J. LippardCite this: Inorg. Chem. 1991, 30, 7, 1625–1630Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical studies in solution of the tetranuclear copper(I) clusters Cu4I4L4 (L = pyridine or substituted pyridine)Kevin R. Kyle, Chong Kul Ryu, Peter C. Ford, and John A. DiBenedettoCite this: J. Am. Chem. Soc. 1991, 113, 8, 2954–2965Publication Date (Print):April 1, 19…
peer reviewed
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, properties, and biodegradation of poly(1,3-trimethylene carbonate)K. J. Zhu, R. W. Hendren, K. Jensen, and C. G. PittCite this: Macromolecules 1991, 24, 8, 1736–1740Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCombined infrared and electron diffraction study of the polymorphism of native cellulosesJunji Sugiyama, Jan Persson, and Henri ChanzyCite this: Macromolecules 1991, 24, 9, 2461–2466Publication Date (Print):April 29, 1991Publication History Published online1 May 2002Publishe…
Abstract Metallomesogens , metal complexes of organic ligands which exhibit liquid crystalline (mesomorphic) character, combine the variety and range of metal‐based coordination chemistry with the extraordinary physical properties exhibited by liquid crystals. Thermotropic metallomesogens have been made incorporating…
Bonds and lone electron pairs can be made “visible” when the electron density distribution is used to calculate the electron localization function (ELF). This paper presents a computer-graphics image of ELF in colors which represent the extent of the localization (at the right a black-and-white picture of N2).
NHIK 3025 cells were incubated with Photofrin II (PII) and/or tetra (3-hydroxyphenyl)porphyrin (3THPP) and exposed to light at either 400 or 420 nm, i.e. at the wavelengths of the maxima of the fluorescence excitation spectra of the two dyes. The kinetics of the photodegradation of the dyes were studied. When present…
Bond-valence parameters which relate bond valences and bond lengths have been derived for a large number of bonds. It is shown that there is a strong linear correlation between the parameters for bonds from cations to pairs of anions. This correlation is used to develop an interpolation scheme that allows the estimati…
Abstract The effect of the heat treatment on as‐spun fibers made of a commercial liquid crystalline polymer, Vectra®, was examined through tensile properties and differential scanning calorimetry (DSC) measurements. The heat treatment increased the fiber strength considerably, and it also increased the elongation at b…
Abstract Modification of fluorine‐containing polymers has recently received much attention due to new chemistries allowing for refunctionalization of these materials, especially their surfaces. In this article results are discussed which demonstrate various interesting modifications (including incorporations of OH an…
Abstract The phase behavior of a series of styrene/maleic anhydride (SMA) copolymers with various polyacrylate and polymethacrylate homopolymers has been investigated using various techniques. None of the polyacrylates are miscible with SMA copolymers. Poly (methyl methacrylate) (PMMA) poly(ethyl methacrylate) (PEMA)…
Abstract The permeability of isotactic poly(phenyl silsesquioxane) (PPSQ) to O 2 and N 2 at 25.0°C and to CO 2 and CH 4 at 35.0°C was measured at low pressures by the “time‐lag” method. PPSQ is a glassy silicone polymer with an 8‐atom ring structure of alternating Si and O atoms. The CO 2 /CH 4 selectivity of PPSQ is…
Abstract The ESR study of the radicals formed in mechanochemical polymerization of acrylamide (AAM) was undertaken. The nature of the radical formation was compared with the mechano‐radical formation produced by mechanical fracture of polyacrylamide (PAAM). The structure of radicals formed were all identified to be an…
Abstract Unsaturated polyanhydrides of the structure [(COCHCHCOO) x (CORCOO) y ] n , were synthesized. The polymers were prepared by either melt or solution polycondensation. Weight average molecular weights of up to 30,000 were obtained. The double bonds remain intact throughout the polymerization proce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterosilsesquioxanes: synthesis and characterization of Group 15 containing polyhedral oligosilsesquioxanesFrank J. Feher and Theodore A. BudzichowskiCite this: Organometallics 1991, 10, 3, 812–815Publication Date (Print):March 27, 1991Publication History Published online1…