Materials Literature
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The aldehyde content of hydro cellulose may be readily estimated by titration with iodine in alkaline solution. Investigation of the rate of oxidation of hydrocellulose by iodine at 0 C and pH 10.6 showed that there is an initial rapid reaction in the first hour accompanied by a side reaction. This latter reaction con…
A bstract Phosphorus pentoxide, which was used first to improve the color of heavy flint glasses, was later recognized as a valuable constituent of optical glasses, and the excellent ultraviolet transmission and low softening points of phosphate glasses have been found recently. Glasses that have a high content of P 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Size Distribution in Three Dimensional Polymers. I. Gelation1Paul J. FloryCite this: J. Am. Chem. Soc. 1941, 63, 11, 3083–3090Publication Date (Print):November 1, 1941Publication History Published online1 May 2002Published inissue 1 November 1941https://pubs.acs.or…
The codeposition of two or more metals so as to form a coat of alloy is an old art, but a new science. Twenty‐five years ago two alloys were being plated on steel; today a wide variety of different alloys are commercially plated on a half dozen basis metals. Applications of alloy plating include decorative and protect…
Brass is plated for the purpose of obtaining rubber adhesion and for ornamental purposes. A brass bath containing <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="ML1" overflow="scroll"> <mml:mi mathvariant="normal">CuCN</mml:mi> </mml:math> , 26.2 g./L.; <mml:math xmlns:mml="http://www.w3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Absorption Spectra. II. 3-Acetoxy-Δ5-(6)-nor-cholestene-7-carboxylic AcidR. B. Woodward and A. F. CliffordCite this: J. Am. Chem. Soc. 1941, 63, 10, 2727–2729Publication Date (Print):October 1, 1941Publication History Published online1 May 2002Published inissue…
Aufstellung des Zustandsschaubildes des Systems Eisen‐Eisensulfid‐Kalziumsulfid durch thermische und Gefügeuntersuchungen.
THE use of dielectric loss and power factor for testing the insulation of electrical equipment in service position in the field with one side grounded began with the advent of the apparatus and method described in this paper. Through its use, tables of standard values have been set up indicating when insulation is “go…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZinc Soaps in Paints. Zinc OleatesA. E. Jacobsen and William Howlett GardnerCite this: Ind. Eng. Chem. 1941, 33, 10, 1254–1256Publication Date (Print):October 1, 1941Publication History Published online1 May 2002Published inissue 1 October 1941https://pubs.acs.org/doi/10.102…
The problem of finding thermal stresses and displacements in long cylinders is reduced to obtaining a particular integral for the Poisson equation ▿2V=kT, where T is the temperature distribution and k is a constant, and to solving the biharmonic equation ▿4U=0 when the first derivatives of the function U are known on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn X-Ray Study of the Structure of Polyvinyl Alcohol*Rose C. L. MooneyCite this: J. Am. Chem. Soc. 1941, 63, 10, 2828–2832Publication Date (Print):October 1, 1941Publication History Published online1 May 2002Published inissue 1 October 1941https://pubs.acs.org/doi/10.1021/ja…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Palladium and Platinum Synthetic High Polymer Catalysts and the Relationship between Particle Size and Rate of HydrogenationLouis D. Rampino and F. F. NordCite this: J. Am. Chem. Soc. 1941, 63, 10, 2745–2749Publication Date (Print):October 1, 1941Publication H…
Abstract This paper reviews recent experimental work on phase transitions in rubber—particularly the change from the amorphous to the crystalline form. Several possible explanations are considered to account for the vagueness of the melting point of rubber. Molecular inhomogeneity does not completely explain the pheno…
By considering all the possible systematic errors in the determination of lattice spacings by the back-reflection camera, methods have been devised for their correction. For cubic crystals, if the observed values of lattice spacing are plotted against cos Φ, where Φ is the supplement of the angle of deviation, a strai…
A detailed study has been made of the lattice imperfections which are assumed to account for plastic deformation. Calculations of the strain energy associated with these dislocations have been made in the following cases: a dislocation in a uniform shear stress, two dislocations in an infinite medium, and a dislocatio…
Abstract A historical introduction outlines the development of experimental and theoretical interest in the diffuse diffraction of X-rays by single crystals. The present experimental study, illustrated by numerous photographs, has consisted in taking Laue, oscillation and rotation photographs, in many different orient…
Abstract Films of tungsten have been prepared, by evaporation from a filament, which bring the reactions pH2=oH2 and H2+D2=2HD to equilibrium in a few minutes at 77° K. Their real surface area could be estimated as about 450 cm.2, from a measurement of the quantity of hydrogen which was rapidly and irreversibly adsorb…
A study was made of the effect of grain size and heat treatment upon the impact-toughness of SAE 1050 steel, as judged by the temperature range wherein cold-brittleness occurred. There was no relation between grain size and impacttoughness in the hot-rolled steels. Normalizing improved this property, and in this condi…
Differential heating curves were used to study the behavior of calcium sulfate at high temperatures. After cooling, the material was examined by means of the petrographic microscope and by study of its X-ray pattern. It was found that the beta-to-alpha transition of calcium sulfate occurs at approximately 1,214 C, and…
A bstract The present picture of the atomic arrangement in glass has developed from four kinds of information, namely, the laws of crystal chemistry, the X‐ray diffraction study of glass, the various measured physical properties of glass, and the kinds of materials and the ranges of composition in which glassforming p…