Materials Literature
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Abstract The thermal decomposition of a number of TDI‐ and MDI‐based biscarbamates (model compounds for polyurethane foams) between 200°C and 1000°C showed that the urethane linkage undergoes an O ‐acyl fission at about 300°C to generate the free isocyanate and alcohol. In the case of the flexible foam analogues, the…
Abstract Generalized line graphs extend the ideas of both line graphs and cocktail party graphs. They were originally motivated by spectral considerations. in this paper several (nonspectral) classical theorems about line graphs are extended to generalized line graphs, including the derivation and construction of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralized standard addition method for multicomponent instrument characterization and elimination of interferences in inductively coupled plasma spectroscopyJ. H. Kalivas and B. R. KowalskiCite this: Anal. Chem. 1981, 53, 14, 2207–2212Publication Date (Print):December 1, 1…
New data are reported which show that the cycles to failure for NiTi are related exponentially to cyclic strain extent (difference between maximum and minimum cyclic strain) to at least 2×105 cycles. The relationship is apparently insensitive to thermodynamic cycle type or to stress/strain mode, but does show strong d…
The room‐temperature strength distributions of a sintered and a hot‐pressed SiC were examined as‐machined, after oxidation at 1370°C, and after oxidation under load at 1370°C. The strengths were observed to be dependent on both the duration of oxidation and the magnitude of the applied load. Processes resulting in bot…
Abstract Reduziertes 2,2′‐Bipyridin, bipy − ˙, bildet paramagnetische Komplexe mit metallorganischen Kationen R n M + aus den ersten drei Gruppen des Periodensystems (n = 0, 1, 2). Die beständigen Radikale [(R n M) bipy]˙ lassen sich durch hochauflösende Elektronenspinresonanz nachweisen und untersuchen. Ihre ESR‐Kopp…
Article Distortions of octahedra and octahedral sheets in 1M micas and the relation to their stability was published on December 1, 1981 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 157, issue 1-4).
Abstract Linear polyesters of the diacid‐dialcohol type are observed to crystallize epitaxially onto substrate crystals of trioxane, condensed aromatic hydrocarbons, and linear polyphenyls. In line with results previously reported for PE, lattice matching requirements for epitaxy lead to a change in the polymer contac…
Abstract An automatic cross‐fractionation system is presented by combining a newly developed crystallizability fractionation device based on the principle of isothermal dissolution with a commercially available GPC. The detail design, procedure, and operation variables are described. The fractions eluted from the devi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScanning electron microscopic and x-ray photoelectron spectroscopic examination of Tokai glassy carbon surfaces subjected to radio frequency plasmasCharles W. Miller, Dale H. Karweik, and Theodore. KuwanaCite this: Anal. Chem. 1981, 53, 14, 2319–2323Publication Date (Print):…
Si 3 N 4 compacts, containing ≅7 wt% of both BeSiN 2 and SiO 2 as densification aids, can be reproducibly sintered to relative densities >99% by a gas‐pressure sintering process. Nearly all densification takes place via liquid‐phase sintering of transformed β‐Si 3 N 4 grains at T =1800° to 2000°C. Compacts with hig…
Article The crystal structure of Benzoic Acid: a redetermination with X-rays at room temperature; a summary of neutron-diffraction work at temperatures down to 5 K was published on December 1, 1981 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 157, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures of titanacyclobutanesJ. Bosco Lee, Gregory J. Gajda, William P. Schaefer, Thomas R. Howard, Takao Ikariya, Daniel A. Straus, and Robert H. GrubbsCite this: J. Am. Chem. Soc. 1981, 103, 24, 7358–7361Publication Date (Print):December 1, 1981Publication History Publi…
Abstract A method for estimating Gibbs free energies and stabilities of clay minerals is proposed for use with computer programs aimed at calculating the chemical evolution of natural water-rock systems. This is based on (i) a model for ideal solid solutions of a large number of end-member compositions and (ii) a data…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered magnetic bimetallic chains: a novel class of one-dimensional compoundsAlain Gleizes and Michel VerdaguerCite this: J. Am. Chem. Soc. 1981, 103, 24, 7373–7374Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inissue 1 Dec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTP-450-tpye dioxygen activation using hydrogen/colloidal platinum as an effective electron donorIwao Tabushi and Akira YazakiCite this: J. Am. Chem. Soc. 1981, 103, 24, 7371–7373Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published i…
Defect statecalculations have been per formed for polyacetylene and polybparaphenylene in the fraamework of the Su, schriever, and Heeger Hamiltonian. In polyacetylene, the study of the energetics of the separation of the radical(natural defect)-ion(charged defect) pair induced upon doping indicates that the two defec…
SUMMARY This report deals with the cutting of wood specimens for observation in the scanning electron microscope. Several cutting devices and types of knives are described and critically evaluated.
Trans-aconitate synthesis via citrate dehydrase was determined in crude extracts of maize (Zea mays L.) coleoptiles. Two molecular forms of this enzyme were purified by substrate-specific elution from DEAE-cellulose, ammonium sulfate precipitation, and gel filtration. Each molecular form migrates as a single band in i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer and Moessbauer spectra of axially substituted iron phthalocyaninesGuy V. Ouedraogo, Claude More, Yves Richard, and David BenlianCite this: Inorg. Chem. 1981, 20, 12, 4387–4393Publication Date (Print):December 1, 1981Publication History Published online1 May 2…