Materials Literature
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Six case histories are given of the use of polyvinylidene chloride film in conjuction with microcrystalline wax to protect underground pipes. It was found that microcrystalline wax of high quality appears to be a superior wetting agent and when wrapped with a protective film of polyvinylidene chloride will thoroughly…
Abstract This paper examines the relationship between the stress-strain properties of highly swollen natural rubber vulcanizates and their equilibrium volume swelling. It is shown that the empirical relationship obtained can be described equally well by either the Flory-Huggins equation or the Flory Modification of th…
Infra-red absorptions now reported for 25 azoaryl derivatives bring the number of N=N- containing structures examined so far up to 83. Indications previously recognized, that the azo-stretching frequencies in azobenzenes lie between 1400 and 1450 cm-1, are confirmed by the present measurements.
Abstract Methods of synthesizing linear polyesters from fluorine‐containing diols have been investigated. The most suitable method consists of reacting the fluorine‐containing diols with dicarboxylic acid chlorides. Number‐average molecular weights in excess of 15,000 have been obtained. The polymers are rubberlike gu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Electron Diffraction Investigation of the Structure of Cuprous Chloride TrimerChi-hsiang Wong and Verner SchomakerCite this: J. Phys. Chem. 1957, 61, 3, 358–360Publication Date (Print):March 1, 1957Publication History Published online1 May 2002Published inissue 1 March 19…
Many ceramic materials can be applied as coatings by flame‐spraying rods made from these materials. Aluminum oxide coatings, stabilized zirconia coatings, and zircon coatings have been studied in detail with regard to their structure and their physical and thermal properties.
Scattering cross sections, scattering coefficients and specific turbidities are calculated from the Mie equations for α = 0.2(0.2)7.0(1)15 and m = 1.05(0.05)1.30; and, in addition, for α = 22(2)32; 39(1)41 and m = 1.05, for α = 16(1)21 and m = 1.10, for α = 7.2(0.2)15.2 and m = 1.20. Thus, the calculations cover virtu…
Possible sources of the anisotropy energy are investigated for ferromagnetic ferrites, i.e., Ni-, Co-, Fe- and Mn-ferrites. The cubic anisotropy energy which arises from the anisotropy of the crystalline field acting on magnetic ions and is described by the function of the spin operator of one ion identically vanishes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and Spin Resonance Spectroscopy of Radicals from Thioaromatic Compounds1Antonino Fava, P. B. Sogo, and Melvin CalvinCite this: J. Am. Chem. Soc. 1957, 79, 5, 1078–1083Publication Date (Print):March 1, 1957Publication History Published online1 May 2002Published inis…
The activation field of BaTiO3 c-domain crystals may be calculated from an experimental determination of the frequency dependence of the coercivity. The ratio of activation fields above and below the orthorhombic transition is equal to the respective ratio of coercivities. The decrease in coercivity in passing through…
Abstract The mechanism of the conductance of the electric current through a carbon black dispersion is still a problem which has not been completely solved. Rubber is an insulator and forms a homogeneous liquid phase, while carbon black is a semi-conductor and forms a dispersible solid phase. Mixtures of these two sho…
Synopsis Starting from the basis that the direction of sliding of one particle relative to another is, in general, inclined at an angle to the direction of the applied shear stress, a theory is developed to account for the difference between peak and residual stresses in terms of the volume expansion of the mass durin…
Current theories of "single-domain" ferromagnetic particles compare the free energy in a state of uniform magnetization with that in an arbitrarily chosen state of nonuniform magnetization. In this paper, the comparison is made between an initial uniform state and all neighboring states, uniform or nonuniform, as an i…
A study of the effect of Li substitution on the electrical properties of the oxides MnO, CoO, NiO, and CuO has been made. It has been found that (1) the activation energy for conduction increases abruptly near the antiferromagnetic Curie point; (2) as Li is added the activation energy and resistivity initially decreas…
Mixtures of 0.8 moles of CaO per mole of SiO 2 plus Al 2 O 3 were prepared from lime, kaolin, and tripoli (microcrystalline quartz); the amounts of SiO 2 to Al 2 O 3 were varied to give from 0.2 to 20.7% Al 2 O 3 by weight of dry solids. After hydrothermal treatment (170° to 175°C.), the products were examined by diff…
The experiment reported in this paper was designed to obtain data on the dynamics of a nonrotating, conical-nosed projectile penetrating randomly-packed sand. Position versus time measurements for the projectile in sand were obtained by means of a photographic-electronic chronograph developed for the purpose. The stri…
Abstract One of the more important advances in rubber science during the past twenty years has been the development of quantitative theories describing the elastic properties of pure-gum vulcanized rubbers. As a result it is now possible to account for their equilibrium stress-strain behavior with considerable success…
The present paper investigates by experiment and theory the mechanisms governing work-hardening, work-softening and slipband formation in face-centred cubic metals. The rapid hardening stage (stage II) of the stress-strain curve is investigated by flow-stress measurements at different temperatures, combined tensile an…
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation B. D. Cullity, R. Smoluchowski; Elements of X‐Ray Diffraction. Physics Today 1 March 1957; 10 (3): 50. https://doi.org/10.1063/1.3060306 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends…
A theory is presented which describes the development of surface grooves at the grain boundaries of a heated polycrystal. The mechanisms of evaporation-condensation and surface diffusion are discussed with the use of the Gibbs-Thompson formula and the assumption that the properties of an interface do not depend on its…