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The synthesis of a new discotic mesogen, 2,3,7,8,12,13-hexa(octadecanoyloxy)-truxene is reported. This new compound has been studied using polarization microscopy, differential scanning calorimetry, small angle X-ray scattering and adiabatic calorimetry. The results are compared with those of two other truxene derivat…
The phase equilibria in the system zirconia‐hafnia‐yttria were investigated at 1300° and 1600°C by precise lattice parameter measurements and the direct phase‐inspection method. Large fluorite solid solution regions were dominant at both investigated temperatures. The extent of ordering within the ternary system was s…
In order to investigate the thermodynamic properties of alkali feldspars, three new feldspar ion-exchange series have been synthesized, two based on monoclinic parent materials having intermediate degrees of Al—Si order, the other on Amelia low albite. Acid solution calorimetric measurements have been carried out in 2…
Conductive (150 μΩ cm), adherent films of zirconium and hafnium borides have been deposited on various substrates by the low-temperature (100–270 °C) thermal decomposition of Zr[BH4]4 and Hf[BH4]4. Auger electron spectroscopy of these films shows that their composition is ZrB2 and HfB2. The film surfaces are oxidized…
Monomer concentration fluctuations in high molecular weight polymer blends are investigated. The fluctuations reduce the value of the χ interaction term in the Flory–Huggins free energy by a factor of (1-6/π2) and add a concentration and molecular weight contribution which decreases phase stability for off-critical co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonmetal redox kinetics: oxidation of iodide by hypochlorous acid and by nitrogen trichloride measured by the pulsed-accelerated-flow methodJulius C. Nagy, Krishan Kumar, and Dale W. MargerumCite this: Inorg. Chem. 1988, 27, 16, 2773–2780Publication Date (Print):August 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared characteristic absorption bands of highly isotactic poly(acrylonitrile)Masatomo Minagawa, Kazuyuki Miyano, Masahiko Takahashi, and Fumio YoshiiCite this: Macromolecules 1988, 21, 8, 2387–2391Publication Date (Print):August 1, 1988Publication History Published online…
Author Institution: Department of Chemistry, University of Virginia
Abstract A kaolinite-polymer intercalation complex was apparently formed for the first time by the polymerization of acrylonitrile between the kaolinite layers. A kaolinite-ammonium acetate intercalation complex was dispersed in acrylonitrile monomer. The monomer was apparently incorporated between the layers by displ…
The calculation of orientation factors determining the anisotropy of dislocation-induced broadening of X-ray diffraction lines in crystals is treated for elastically anisotropic materials in terms of a general formalism. The application of the procedure is demonstrated by representation of a computer program and numer…
The application of scaling laws to fiber composite laminates is discussed. Particular emphasis is placed on the case of impact loading. Scaling difficulties and conflicts are identified and illustrated in an experimental program based on impacted carbon-fiber composite beams. It is shown that the lay-up of laminates i…
Abstract An analysis of the Gordon‐Taylor equation shows that its background is based on additivity. The corresponding parameter K = ρ 1 Δα 2 / (ρ 2 Δα 1 ), however, may include also an interaction contribution if the quadratic concentration term is neglected in a virial‐like extension of the glass transition temperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrisubstituted heteropolytungstates as soluble metal oxide analogues. 4. The synthesis and characterization of organic solvent-soluble (Bu4N)12H4P4W30Nb6O123 and (Bu4N)9P2W15Nb3O62 and solution spectroscopic and other evidence for the supported organometallic derivatives (Bu…
Abstract Near-infrared (NIR) reflectance spectra for mixtures of ordered kaolinite and ordered dickite have been found to simulate the spectral response of disordered kaolinite. The amount of octahedral vacancy disorder in nine disordered kaolinite samples was estimated by comparing the sample spectra to the spectra o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of fluorine-containing aromatic polybenzoxazoles from bis(o-aminophenols) and aromatic diacid chlorides by the silylation methodYutaka Maruyama, Yoshiyuki Oishi, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1988, 21, 8, 2305–2309Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic SOx abatement: the role of magnesium aluminate spinel in the removal of SOx from fluid catalytic cracking (FCC) flue gasAlak A. Bhattacharyya, Gerald M. Woltermann, Jin S. Yoo, John A. Karch, and William E. CormierCite this: Ind. Eng. Chem. Res. 1988, 27, 8, 1356–1…
The empirical database of Villars and Calvert on the structures of pseudobinary and ternary phases is ordered within a limited number of two dimensional plots by using the recently proposed Mendeleev number M, which takes a unique value for each element in the periodic table. The pseudobinaries are characterised by av…
The work presents an analysis and comparative evaluation of different methods used for the numerical solution of heat conduction with phase change problems. Both freezing (melting) water as well as solidifying liquid metal problems are examined. Emphasis is placed on weak formulations as they tend to be simple to prog…
Stability constants for the formation of Fe(III)-S(IV) complexes at µ = 0.4 M were determined spectroscopically. Values of K_1 = 10^(6.6) M^(-1) for Fe^(3+) + SO_3^(2-) ⇌ FeSO_3^+ and K_4 = 10^(7.3) M^(-1) for FeOH^(2+) + SO_3^(2-) ⇌ HOFeSO_3 were obtained. Raman measurements indicate that sulfite binds to the metal t…
The contributions of nonlinear fracture processes both in the microcracking frontal process zone and in the following wake region and of grain bridging to crack‐growth resistance parameters are discussed in terms of the R‐curve behavior of an isotropic polycrystalline graphite. The R‐curve behavior of the graphite is…