Materials Literature
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When solid heterocyclic dicarboxylic acids and their hexamethylenediammonium salts are heated in a sealed system, temperature‐pressure diagrams are obtained which allow the determination of the exact temperature at which decarboxylation starts. Some decarboxylation points are indicated.
A tracer study has been made of the polymerization of acrylonitrile in an aqueous solution at 25°C with the use of radioactive K2S352O8 and NaHS35O3 in a redox catalyst system. Persulfate and bisulfite give sulfate and sulfonate endgroups, respectively. The contents of these endgroups in the polymer were determined an…
The crystal structure of CuOHCl has been determined by X‐ray single crystal methods. The structure was refined by F OURIER methods and by three‐dimensional « least square» treatment. CuOHCl has a monoclinic cell with
It is demonstrated that the presence of surface oxide films on aluminum, prior to anodizing in a pore‐forming electrolyte, can reduce the number of surface pores and the surface roughness compared to that normally obtained with fresh aluminum surfaces. Electron micrographs show that, in such a case, porous anodization…
Exploratory experiments are described followed by an account of a more systematic study of the corona discharge with concentric-cylinder electrodes. From experimental records which relate the charge flow in an external circuit to the applied voltage, the corona current and energy loss were derived. An attempt is made…
R. J. Abraham, A. H. Jackson and G. W. Kenner, J. Chem. Soc., 1961, 3468 DOI: 10.1039/JR9610003468
This paper summarizes the measurements which have been made to determine various physical parameters for the compounds Ga 2 Te 3 and In 2 Te 3 . The previously described problems of the preparation of stoichiometric In 2 Te 3 and Ga 2 Te 3 and the associated question of ordering of lattice vacancies in In 2 Te 3 are r…
Electron spin resonance of a water solution and of the pure powder of K3[Cr(CN)5NO]·H2O reveal a single sharp resonance line at room temperature. The water solution resonance gives a Cr53 hyperfine structure which is further split by a ``superhyperfine'' structure due to the nitrogen in the NO ligand. From the electro…
Nach der Barrerschen Methode werden die Permeations-, Diffusions- und Löslichkeitskoeffizienten permanenter Gase in Terylen und Polypropylen verschiedenen Kristallisationsgrades bestimmt. Die drei Größen sind bei den kristallisierten Stoffen gegenüber den entsprechenden amorphen erheblich erniedrigt. Ebenso verhält es…
The action of water at 100°C on barrier anodic aluminum oxide has been studied for reaction times up to 30 min. The hydrated product is essentially the same as that formed when aluminum metal reacts with water under the same conditions. Furthermore, the rate of hydration of anodic oxide is remarkably similar to the ra…
Abstract The polycondensation reaction of hexamethylenediammonium adipate (nylon 66 salt) has been studied in the presence of water in 0.5–10.0 molar ratio. The reaction proceeds extremely fast and reaches equilibrium after about 5 hours at 200‐220°C. The apparent equilibrium constant between chain molecules increases…
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Two properties of nonstoichiometric zirconium dioxide powder have been studied. Pressures of oxygen in equilibrium with , with 0.03 > x > 0, have been determined at temperatures of 900°, 1000°, and 1100°C by passing hydrogen‐water vapor mixtures over the oxide. The measured pressures are in the range 10 −20 to 10 −12…
J. A. Elvidge and A. B. P. Lever, J. Chem. Soc., 1961, 1257 DOI: 10.1039/JR9610001257
Abstract not Available.
With solutions containing Cl − ions Pt anodes dissolve as , this corrosion being quantitative for low current densities. It is known that attack by d.c. is enhanced by increasing temperature, high Cl − concentration, and high acidity. Some inhibitors, especially sulfur‐containing compounds, almost inhibit anodic corro…
The tensile deformation of chemically polished magnesium oxide crystals has been correlated with the distribution of slip at the onset of plastic flow. If two slip bands, generated on orthogonal {110} planes, happen to intersect to nucleate a crack before other slip bands develop nearby, then the crack so formed is un…
Zur Ergänzung bekannter Verfahren zur Bestimmung thermodynamischer Kenngrössen von Legierungen 1 wurden folgende Möglichkeiten experimenteil geprüft:( 1) Direktkalorimetrische Vereinigung der Komponenten (a) mit Fe-S-Gemisch (50 At. prozent) als Zündmaterial (b) durch Zündung mit einem in das Kalorimeter fallenden Hei…
Tafel‐type cathodic polarization curves were obtained for aluminum alloys corroding in anaerobic acid and food media. The overvoltage‐intercept method was found to give corrosion currents equivalent to the measured rates of hydrogen evolution. Tafel‐type anodic polarization curves could not be obtained. Anodic polariz…
Theories of the mechanism of film growth and breakdown on zirconium and zircaloy‐2 are discussed in the light of recent evidence obtained at A.E.R.E. and a further explanation of the observed phenomena is offered. Additional experiments which are necessary to obtain confirmatory information are considered.