Materials Literature
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The polymorphic behavior of poly(vinylcyclohexane) is discussed on the basis of conformational energy calculations on an isolated chain. The presence of two different modifications is in accordance with the energy minima present in the conformational energy maps. The packing of the chains in form I is analyzed on the…
A slight shoulder in the shear relaxation spectrum ( H ) at the relaxation time for the main maximum of the retardation spectrum ( L ) was detected for three amorphous polymers: polystyrene, poly(vinyl acetate), and a slightly vulcanized natural rubber. This finding is discussed in terms of a distinctive manifestation…
Density functional methods have been used to investigate the valence electronic structures of four complexes containing 1,4-diazabutadiene (dab) ligands. One compound was chosen from each of the four ‘blocks’ of the Periodic Table, viz.[Li(dab)2], [Ga(dab)2], [Co(dab)2] and [Th(dab)(NH3)(NH2)3]. The well documented st…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInterpenetrating Liquid Crystalline Polymer NetworksYue Zhao and Guoxiong YuanView Author Information Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1Cite this: Macromolecules 1996, 29, 3, 1067–106…
Molecular dynamics calculations have been used to study the stability of a titanylphthalocyanine (TiOPc) crystal called Y-form. This crystal is of interest as a photoconductive material. A Parrinello–Rahman molecular dynamics calculation and a rigid-molecule intermolecular potential have been used in this study. The p…
A simple biofilm sampling device is used to collect representative microcoenoses from the River Alb in Germany. The samples are analyzed for their copper, cadmium and lead contents and the results are shown to be comparable to those from the techniques.
The synthesis of a new series of push–push systems based on furan-2,5-diylvinylene oligomers end-capped with l,3-dithiol-2-ylidene electron-releasing groups is described. 1H NMR spectroscopy and X-ray diffraction reveal that the molecules adopt a planar conformation stabilized by strong intramolecular interactions. El…
Oxygen is intercalated, using a solution-based route at ambient temperature, into a pyrochlore oxide, thus establishing a new class of pyrochlore-based interstitial solid solutions: the specific system studied is Ce2Zr2O7 and compositions in the range Ce2Zr2O7 +x, 0 < x < 0.36 are obtained; the structure of the most o…
The layered perovskite oxide, KSr2Nb3O10, was synthesized. The interlayer potassium cations were readily exchanged by protons in hydrochloric acid solution to give the protonation compound, HSr2Nb3O10·0.5H2O. The intercalation compounds, [NH3(CH2)nNH3]xSr2Nb3O10, were also obtained by acid-base reactions between the p…
To improve cleanliness in steel requires a reduction in total oxygen content. The combined EAF-LF-RH-CC process of manufacturing utilized several technologies which reduce total oxygen content. In high carbon chromium bearing steels, total oxygen content has decreased annually and is now 5 ppm on the average.1) Along…
The oxidation behavior of Zr2 (Fe, Ni) precipitate in Zircaloy-2 was examined by microprobe Auger electron analysis focussing attention on the oxidation behavior of iron and nickel. In the pre-transition period, the iron oxide was formed only on the top surface of zirconium oxide layer of the precipitate and the thick…
Tetrafluoroethylene/perfluoromethyl vinyl ether copolymer was exposed to electron beams and analyzed for structural changes and volatiles generated via infrared spectroscopy. When the copolymer is irradiated, gases are produced, mass loss is induced, and acid fluoride end groups are formed in the bulk. CF 4, COF 2, CO…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSonochromic Effect in WO3 Colloidal SuspensionsPrashant V. Kamat and K. VinodgopalView Author Information Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556 Department of Chemistry, Indiana University Northwest, Gary, Indiana 46408Cite this: Langmuir 1996…
Magnetic viscosity has been investigated in four samples of melt-quenched and sintered NdFeB. The irreversible magnetization has been measured using two different techniques based on measurements of the DCD remanence curve and the reversible susceptibility. The difference in the value of /spl lambda/ (sometimes known…
High efficiency for selective ethene oxidation of catalysts containing PdCl2 and Mn2+ salts of heteropoly acids [H3 +xPMo12 –xVxO40(0 ⩽x⩽ 3)] supported on silica suggests a synergetic interaction between Pd2+ and Mn2+HPMoVx.
Films of poly(3-alkylthiophenes) on glass substrates were oxidized with acetonitrile solutions of AuCl 3 to yield electronically conductive materials containing the AuCl 4 - counterion, whereas oxidation with nitromethane solutions resulted in both AuCl 4 - -doped polymer and electroless deposition of metallic gold. X…
Thermoplastic elastomers, e.g., EPR, EPDM etc., are commonly used as modifiers of the ductility of PP, PE, HDPE or other general purpose thermoplastics. The objective of this study is to develop a high performance PP/HDPE/SBS polymer blend which possesses excellent toughness and strength equivalent to those of more ex…
Recovery of water with inorganic compounds in kraft black liquor was studied by pressure carbonation followed by different combinations of membrane separation processes. Experiments were carried out to observe the effect of carbonation on black liquor, in terms of conversion of lignin-bound alkali compounds into carbo…
EXAFS data for amorphous Ph3SbO are consistent with a structure in which trigonal-bipyramidal SbPh3O2 units share their axial oxygens to form a chain kinked at the oxygen atoms.
Extended X-ray absorption fine structure (EXAFS) spectroscopy has been used to characterise polyoxometalates of the type MmOyn– and XxMmOyn– in the solid state and in solution. The best fit to the low-temperature (80 K) niobium K-edge EXAFS of K7[HNb6O19]·13H2O was obtained with one terminal oxygen at 1.79 Å(M–Ot), fo…