Materials Literature
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Abstract CsCu 2 Cl 3 und CsCu 2 Br 3 wurden auf trockenem Wege durch Synproportionierung von Gemengen CsX/2 CuX (X = Cl, Br) bzw. CsCuCl 3 mit der Gefäßwand eines Cu‐Bömbchens als metallischem Substrat in Form von Einkristallen erhalten. Es ist für CsCu 2 Cl 3 (CsCu 2 Br 3 ): a = 950,75(9) (987,3(1)), b = 1189,8(2) (1…
The electron density distribution in a crystal of MnTiO3 has been investigated with the single-crystal X-ray diffraction method. A small amount of partial disorder was observed in the cation arrangement of the crystal examined. Deformation densities were observed around the Mn 2+ ion and these are presumed to be due t…
The hot wire method for the measurement of thermal conductivity is generalised to the configuration where the wire separates the half-spaces of homogeneous materials, having different thermal conductivities and diffusion constants. This configuration has several advantages since it enables the construction of a measur…
Abstract We report polarized photon correlation measurements of bulk poly(phenylmethyl siloxane) (PPMS) with a molecular weight of about 2500 at different pressures from 1 to 1750 bar and temperatures between 269 and 308 K. In the Frequency range accessible by present‐day digital correlators, the time correlation func…
Abstract Tarnishing layers grown on copper exposed to air contaminated by traces of sulfur dioxide and/or hydrogen sulfide were detected by a coulometric and characterized by a chemical method. Depending on the nature of the corrosive gas, or on the use of a gas mixture, it was found that sulfate, sulfide, oxides or a…
Abstract not Available.
Abstract Raman and infrared vibrational spectra have been recorded for o ‐phthalic acid as a single crystal, as a powder and in solution. The proposed assignment of the observed frequencies was made on the basis of a normal coordinate analysis and symmetry considerations of the crystal spectrum, which allowed the sepa…
Abstract In this article we review the synthesis and morphology and the physical and mechanical properties of two‐component interpenetrating polymer networks (IPNs) from polyurethane and epoxy polymers; the corresponding pseudo‐IPNs and grafted IPNs are also discussed. A comparison was made of full IPNs, pseudo‐IPNs,…
The Raman spectra of 2H–NbS 2 and 2H–TaS 2 have been analyzed in terms of a valence-force-field (VFF) model that incorporates four parameters. Analytic expressions for the Brillouin-zone-centre phonon frequencies have been obtained from the model and used in conjunction with the Raman frequencies to evaluate the four…
Several spectroscopic techniques are used to investigate the stoichiometry and properties of ATP complexes with lanthanide(III) (Ln(III)], ions. The ATP2-lanthanide(III) complex predominates at millimolar ATP levels and dissociates to the 1:1 complex with a Kd of 300 +/- 50 microM for the Eu(III) case. Two independent…
This is the third and final contribution on the diatom flora recorded in the vicinity of the Pretoria Salt Pan. In the taxonomic section notes and illustrations (light and electron microscopy) are given for 19 of the 35 listed species. Hierdie artikel is die derde en laaste oor die diatoomflora wat in die omgewing van…
The density, thermal expansion behavior, and transformation‐range viscosity of barium germanate glasses containing 0 to 9 mol% BaO were measured. The addition of BaO to Ge0 2 resulted in phase separation at all BaO concentrations. The results of the property measurements indicate that glasses containing up to 3 mol% B…
Abstract The mechanical behavior of chlorinated polyethylene (CPE)‐modified poly(vinyl chloride) (PVC) has been determined. The nature of the irreversible deformation processes which are responsible for mechanical energy absorption has been investigated by optical and electron microscopic techniques. Addition of CPE r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-affinity binding of quinine to iron(III) porphyrins: novel formation of alkoxide complexes from alcohols and aminesD. V. Behere and Harold M. GoffCite this: J. Am. Chem. Soc. 1984, 106, 17, 4945–4950Publication Date (Print):August 1, 1984Publication History Published on…
We have investigated the dielectric constants and the rotational viscosity of 4-cyano-3-fluorophenly 4-heptylbenzoate. A dielectric anisotropy of about 50 has been measured in the nematic phase and related to the absence of molecular association. This outstanding property can be exploited in the twisted nematic displa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of the grafting ratio on the conformations of poly(ethylene oxide) chains grafted on silicaH. Hommel, A. P. Legrand, P. Tougne, H. Balard, and E. PapirerCite this: Macromolecules 1984, 17, 8, 1578–1581Publication Date (Print):August 1, 1984Publication History Publi…
The orientational order of molecules in a liquid crystal is traditionally described by spatial or temporal averages of functions that are quadratic in the direction cosines of molecular axes with respect to laboratory fixed axes. The free energy describing the nematic phase must be independent of the choice of coordin…
Abstract For the purpose of efficient utilization of waste polystyrene, the recovery method of a styrene oligomer having a molecular weight of 1000–3000 was studied. Thermal and catalytic degradations were carried out. It was impossible to obtain a styrene oligomer with a molecular weight less than 5000 by thermal deg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Creutz-Taube complex revisited: a single-crystal EPR studyAnton Stebler, John H. Ammeter, Urs Fuerholz, and Andreas LudiCite this: Inorg. Chem. 1984, 23, 18, 2764–2767Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1…
Abstract Blends of poly(vinyl butyral) (PVB) and of a copolymer of bisphenol A and epichlorohydrin (Phenoxy) with poly( N ‐vinyl‐2‐pyrrolidone) (PVP) were prepared by solution casting. The glass transition temperatures T g for different compositions of the blends were measured by differential scanning calorimetry (DSC…