Physical Chemistry of High Polymers
Abstract not Available.
Materials Literature
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Radiation Damage Effects in Ferroelectric Triglycine Sulfate
Peculiar changes in the ferroelectric hysteresis loops of single crystals of triglycine sulfate result when the crystals are subjected to ionizing radiations (x-rays and electrons). Fully polarized crystals develop hysteresis loops biased along the field axis while partially polarized crystals develop double-loop patt…
Ultraviolet induced crosslinking and grafting of solid high polymers
Abstract The production of crosslinks and of sites for grafting in solid high polymers can be achieved by hydrogen abstraction. This hydrogen abstraction reaction can be carried out by means of far ultraviolet light (200–300 mμ). The rate of the reaction is tremendously increased if certain sensitizers are incorporate…
Crystallinity effects in the electron microscopy of polyethylene
Single crystals of polyethylene were examined electron-microscopically with special precautions to avoid damage due to the electron beam. A variety of unexpected beam-sensitive features were observed. They can be classified as (1) moirés. (2) morphological features. In connection with (1) the general principles of moi…
Morphologische strukturen in polyäthylenen, polyamiden und anderen kristallisierenden hochpolymeren
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…
Semiempirical Treatment of the Hydrogen Bond
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…
The Molecular Configuration of Dicobalt Hexacarbonyl Diphenylacetylene
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…
Polymethylene and the structure of polyethylene: Study of short‐chain branching, its nature and effects
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…
Electron Spin Resonance ofMn++in Alkali Chlorides: Association with Vacancies and Impurities
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) ${\mathrm{Mn}}^{++}$…
797. Comparative reaction rates in solid and in liquid sulphuric acid–water mixtures
T. G. Bonner and J. C. Lockhart, J. Chem. Soc., 1959, 3963 DOI: 10.1039/JR9590003963
Studies on Tetralin Derivatives. VII
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…
Production of Electrolytic Copper Powder
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.
Anodic Dissolution of Magnesium Alloys in Aqueous Salt Solutions
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…
On the Crystallization of Simple Rhombohedral Boron from Platinum
Abstract not Available.
Observations on the Mechanisms and Kinetics Of Aqueous Aluminum Corrosion: Part 1—Role of the Corrosion Product Film In the Uniform Aqueous Corrosion of Aluminum
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 heat of sublimation of aluminium trifluoride and the heat of formation of aluminium monofluoride
The first page of this article is displayed as the abstract.
Reaktionen und Gleichgewichte in Alkalihydroxydschmelzen. III. Peroxydgleichgewichte
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 Pitting Corrosion
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…
Untersuchung der binären Systeme BaOSnO2 und BaOPbO2. II. Kristallstrukturbestimmungen
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…
Homophase and heterophase fluctuations in semiconducting crystals
R. E. Burgess, Discuss. Faraday Soc., 1959, 28, 151 DOI: 10.1039/DF9592800151