Materials Literature
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Abstract Bei der Kristallisation von Niederdruckpolyäthylen aus Lösung in dünnsten Filmenerhält man lamellen‐bzw.fibrillenartige Einkristalle, in denen nach Elektronenbeugungsmessungen die Molekülketten senkrecht zur Lamellenbene bzw. zur Längsrichtung der Fibrillen stehen. Die Moleküle müssen also gefaltet sein. Bei…
A semiempirical treatment of the hydrogen bond based on a slightly modified Lippincott-Schroeder potential has been used to construct potential surfaces for simultaneous hydrogen and oxygen motion in OH···O hydrogen bonds. The resulting potential curves have been used to interpret the changes in infrared spectra and i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular Configuration of Dicobalt Hexacarbonyl DiphenylacetyleneW. G. SlyCite this: J. Am. Chem. Soc. 1959, 81, 1, 18–20Publication Date (Print):January 1, 1959Publication History Published online1 May 2002Published inissue 1 January 1959https://pubs.acs.org/doi/10.102…
Abstract Model compounds in the form of polymethylenes, linear and branched, have been prepared and used to develop methods of measuring the numbers and lengths of branches in polymethylene. The polymethylenes used for calibration work contain deuterated butyl branches; the numbers of branches present in the polymers…
The spin resonance of ${\mathrm{Mn}}^{++}$ in LiCl, NaCl, and KCl is described. In NaCl, five different spectra are observed. Designated I, II, ${\mathrm{III}}_{1}$, ${\mathrm{III}}_{2}$, and IV, these arise from ${\mathrm{Mn}}^{++}$ ions in five different environments. These are identified as (I) ${\mathrm{Mn}}^{++}$…
T. G. Bonner and J. C. Lockhart, J. Chem. Soc., 1959, 3963 DOI: 10.1039/JR9590003963
The alkyl group in 7-alkyl-5, 8-dihydroxy-α-tetralone was extended from C2 to C10 and their oxidation with ferric chloride was examined. It was found that oxidation is effected irrespective of the length of alkyl group and 2-alkyl-8-hydroxy-1, 4-naphthoquinone derivatives are obtained in good yield. The melting point…
A detailed description of the operation, equipment, and quality control used in the commercial production of electrolytic copper powder is presented. The effect of electrochemical and mechanical variables on the physical characteristics of electrolytic copper powder is also reviewed.
The anodic dissolution of a magnesium AZ10A alloy has been studied by measuring corrosion rates and electrode potentials as functions of current density, p H, and electrolyte concentration. Results are interpreted in terms of a rate‐controlling proton transfer step through a surface film of magnesium oxide and/or hydr…
Abstract not Available.
Several experiments are discussed from the standpoint of their implications on the role of the corrosion product film formed on aluminum during uniform aqueous corrosion both as the principal form of corrosion and as a prelude to intergranular penetration. The experiments include barrier film measurements, the effect…
The first page of this article is displayed as the abstract.
Abstract Es wurde das zur Bildung von Alkaliperoxyden führende Gleichgewicht zwischen Alkalihydroxydschmelzen und Sauerstoff in Gegenwart von Wasserdampf bei 410° und 510°C näher untersucht. In trockenem, reinem Sauerstoff wurden bei 410°C maximal folgende Mengen Peroxyd gebildet: magnified image . Während es sich bei…
A critical analysis of the literature on pitting corrosion published during the past 35 years is presented. The definition of pitting and the factors influencing this type of attack are considered. An examination of the theories of pitting corrosion and the methods used to study this form of corrosion are also include…
Abstract Von den drei Verbindungen Bariumorthostannat(IV), Ba 2 SnO 4 , Bariummetaplumbat(IV), BaPbO 3 , und Bariumorthoplumbat(IV), Ba 2 PbO 4 , wurden mit dem Zählrohrgoniometer Pulver‐Diagramme hergestellt. Für das erstmals dargestellte BaPbO 3 wurde in Analogie zum BaSnO 3 das kubische Perowskitgitter gefunden mit…
R. E. Burgess, Discuss. Faraday Soc., 1959, 28, 151 DOI: 10.1039/DF9592800151
D. D. Perrin, J. Chem. Soc., 1959, 1710 DOI: 10.1039/JR9590001710
Abstract Samples of Ziegler‐type polyethylene containing no additives were placed in a temperature‐programmed oven, melted, and subsequently cooled at constant rates. Average spherulite size, based on the measurement of fifty spherulites, and impact strength by a falling ball method were determined for different cooli…
A general rate equation is derived for a model of a barrier scale layer being formed by a diffusion process and simultaneously being depleted at a constant rate by a secondary process. The equation, derived to satisfy rate curves for sulflde scaling of iron in hydrogen sulfide, is shown to be applicable to the oxidati…
Two mechanisms have been proposed to account for the observed large yield of secondary electrons in gaseous breakdown at high electric fields. In one of these a single ion in approaching the cathode surface creates a ``pass'' by decreasing the width of the potential barrier. In the other the increased over-all field d…