Materials Literature
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An unsymmetric diblock copolymer has been suggested to be more effective than a symmetric diblock copolymer for compatibilization of a blend of two homopolymers. It reduces the formation of the micelle which competes with the preferred adsorption of the diblock at the interface of the two homopolymer fields. The homop…
The suitability is considered of employing a Taylor expansion of the kinematic scattering equation for analysing and interpreting diffuse diffraction intensities induced by atomic displacements. The diffuse scattering caused by static atomic displacements in yttria-stabilized cubic zirconium oxide is used as a test of…
A direct method is proposed for the determination of the modulation in incommensurate intergrowth compounds. The method is based on a new type of Sayre equation that relates the phase of a satellite reflection to the sum of structure-factor products of pairs of main reflections. Phases of satellite reflections are thu…
The fine structure of melt-crystallized shish-kebabs is investigated by means of TEM, SAXS, DSC and RS. In addition to the well known two morphological entities (shish and kebab), a third entity called “transitional zone” has been detected by TEM and two independent SAXS maxima. The transitional zone is characterized…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification of isomeric meso-Dioxo derivatives of octaethylporphyrin and separation and structural characterization of the nickel(II) complexesAlan L. Balch, Marilyn M. Olmstead, and Shane L. PhillipsCite this: Inorg. Chem. 1993, 32, 18, 3931–3936Publication Date (Print):…
This paper is divided into two parts. First the various orbital patterns favoring a ferromagnetic interaction between molecular units are explored. Two types of mechanisms are distinguished according to whether they require or not an electron transfer between the molecular units. As far as the mechanisms requiring no…
We present numerical results of the deterministic Ginzburg-Landau equation with a concentration-dependent diffusion coefficient, for different values of the volume fraction \ensuremath{\varphi} of the minority component. The morphology of the domains affects the dynamics of phase separation. The effective growth expon…
The thermally initiated oxidation of cationic, anionic, and hydrolytic polymers of caprolactam (6-hexanelactam) was followed by determination of the oxygen uptake, molecular weight, and concentration of amino and carboxylic groups. In order to establish the effect of catalyst residues, unextracted as well as extracted…
Abstract The outstanding chemical and physical qualities of polypropylene (PP) combined with an attractive price have made it one of the protagonists in the food‐packaging industry. Like other polymers, however, PP tends to lose some of its constituents to the packed product, by migration, and when submitted to therma…
Various types of 2,3- and 1,2-benzo-substituted zinc-phthalocyanines were prepared to investigate the influence of the substitutions on the electronic states of phthalocyanine (Pc) compounds. The experimental data showed that these compounds can be categorized by their spectral patterns. A simple perturbation method b…
The structure hardly changes when the cluster [Ir14(CO)27]− (1) is reduced to the dianion or oxidized to the neutral compound. The 14 Jr atoms form a trigonal bipyramid, which contains an Jr atom at the center of every edge (see picture). The terminal CO ligands cover the metal framework completely.
The ring-opening polymerization of various cyclic monomers has been extensively investigated in the past, e.g., the cationic polymerization of tetrahydrofuran, the anionic polymerization of ∊-caprolactone, the metathesis polymerization of cycloalkenes, and the anionic or cationic polymerization of cyclohexamethyltrisi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChalcogenide substitution reactionsJonathan M. McConnachie, John C. Bollinger, and James A. IbersCite this: Inorg. Chem. 1993, 32, 18, 3923–3927Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September 1993https://d…
Monoclinic crystals of turkey egg lysozyme (TEL, E.C. 3.2.1.17) were obtained from 2.2 M ammonium sulfate solution at pH 4.2. They belong to space group P2(1) with unit-cell dimensions a = 38.07, b = 33.20, c = 46.12 A and beta = 110.1 degrees, and contain one molecule in the asymmetric unit (V(m) = 1.91 A(3) Da(-1)).…
Temperature dependence of piezoelectric properties was measured for a tetragonal and a rhombohedral Pb(Zr, Ti)O 3 (denoted as t -PZT and r -PZT, respectively). A least squares fitting of complex admittance data was employed in order to precisely determine various electromechanical constants. It was confirmed that the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectroless metalization of halloysite, a hollow cylindrical 1:1 aluminosilicate of submicron diameterSubhash Baral, Susan Brandow, and Bruce P. GaberCite this: Chem. Mater. 1993, 5, 9, 1227–1232Publication Date (Print):September 1, 1993Publication History Published online1…
The series of reagents, pyrophosphate, oxalate, and dithionite have been applied sequentially in the characterisation of a group of podzolic soils and the cumulative amount of iron (Fe), aluminium (Al), and silicon (Si) extracted has been compared with the amounts removed when the reagents are used separately on diffe…
The Electron Paramagnetic Resonance (EPR) technique is described as a valuable tool in order to probe the spin correlations in π-radical magnets. The peculiar features of the EPR response of low dimensional exchange coupled spin systems are recalled. The extreme sensitivity of the resonance field to both magnetic and…
Abstract Simultaneous IPNs of poly(dimethyl siloxane‐urethane) (PDMSU)/poly(methyl methacrylate) (PMMA) and related isomers have been prepared by using new oligomers of bis(β‐hydroxyethoxymethyl)poly(dimethyl siloxane)s (PDMS diols) and new crosslinkers biuret triisocyanate (BTI) and tris(β‐hydroxylethoxymethyl dimeth…
Abstract Silica-indurated subsurface horizons of an in situ lateritic profile in semi-arid western Australia were investigated using a range of electron-optical and X-ray diffraction (XRD) techniques. These indurated materials were compared with underlying non-indurated pallid zone material. The secondary silica conte…