Materials Literature
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Abstract Relations between degree of crosslinking and gel fraction in a polymer have been derived by several authors. An important parameter in these relations is the crosslinking index γ, the average number of crosslinks to which one original polymer molecule is linked. The relations have been applied to the determin…
The values for a number of physical properties are reported for a very high density form of thorium dioxide. When specimens of a mixture of 99½% ThO 2 and ½% CaO, by weight, were hydrostatically pressed at 30,000 lb. per sq. in. and heat‐treated for 1 hour at 1800°C., they attained 99.0% of theoretical density. All th…
Measurements of magnetic viscosity in equiaxed isotropic and anisotropic Alcomax III specimens have been made; the anisotropy was induced by cooling the material, from the single phase region, in a magnetic field of 4000 Oe. The results are discussed in terms of the concept of the thermal activation of irreversible do…
Abstract Die Hydridbromide der Erdalkalimetalle (CaHBr, SrHBr, BaHBr) lassen sich durch Zusammenschmelzen von Hydrid und wasserfreiem Bromid bzw. von Metall und Bromid in einer Wasserstoffatmosphäre bei 900° darstellen. Dabei fallen die Verbindungen in großen, glänzenden Blättchen an und ähneln in ihrem Aussehen weitg…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 144-147. Rare Earth Oxides. Yttrium Sesquioxide, Y2O3; Dysprosium Sesquioxide, Dy2O3; Erbium Sesquioxide, Er2O3; Ytterbium Sesquioxide, Yb2O3Eugene. StaritzkyCite this: Anal. Chem. 1956, 28, 12, 2023–2024Publication Date (Print):December 1, 1956Publica…
An investigation has been made of the formation of manganese ferrite by solid‐state reaction from mixtures of Mn 3 O 4 and Fe 2 O 3 in a 1 : 3 mole ratio, employing four different firing cycles. The solid‐state reaction was observed by means of X‐ray diffraction, optical microscopy, mass analysis, and differential the…
Abstract The film theory of liquid‐side resistance to gas absorption, embodying the assumption of a thin stagnant liquid film adjacent to the interface in which steady state diffusion occurs, has long been open to question, particularly in packed columns. Higbie's penetration theory, believed to be more reasonable, pi…
Equations are developed for the current as a function of applied voltage during electrolytic solution or deposition at surfaces which are perfect, atomically rough, or smooth except for the steps of screw dislocations. It is shown that the surface structure does not influence the rate of deposition if the overvoltage…
Verbindung des Cyclopentandion-dicarbonsure-dithylesters (V) umgesetzt. Das wahrscheinlich zuerst entstandene Reaktionsprodukt VI wurde nicht isoliert. Dagegen konnte der thylester VII (C18H18Oh, Schmp. 134-135, korr.) erhalten werden. Die Tatsache, da hierbei der Lactonring geschlossen worden ist, beweist, da die ter…
The permittivity and power factor of ceramic barium titanate and barium titanate solid solutions have been measured as a function of time, starting from the time of cooling the material through the Curie point. Both parameters decrease linearly with log t over periods extending to several years. A theory is proposed w…
Effusion measurements have been carried out with uranium dioxide over a temperature range from 1600° to 2800°K and a pressure range from 10—8 to 6 mm. Four different isotopic compositions, three different effusion cells and two different apparatuses were used. The results are concordant and demonstrate that the oxide…
The phenomenological theory of the thermoelectric effects in a cubic or isotropic electronic conductor is developed. It is shown that, as a consequence of the appropriate Onsager relation, the "gauge" adopted here for the thermoelectric coefficients of a single substance is such that the second Kelvin relation takes a…
The theory of Stevens for covalent XY 6 complexes is developed for the cases of d 3 and d 5 with low symmetry, and compared with the magnetic resonance results of the preceding paper. The effect of the coupling to the doublet states on the spin Hamiltonian constants for the d 3 complexes is found to be small compared…
ADVERTISEMENT RETURN TO ISSUEPREVBook and Media Revie...Book and Media ReviewNEXTThe chemistry and reactivity of collagenArthur W. Thomas Cite this: J. Chem. Educ. 1956, 33, 12, 652Publication Date (Print):December 1, 1956Publication History Received3 August 2009Published online1 December 1956Published inissue 1 Decem…
Abstract The effect of chain branching on the dynamic mechanical properties of polyethylene within the temperature region 80 to 380°K. has been studied using an apparatus which drives rod‐like specimens in their transverse modes. The results for three types of polyethylene having 3.2, 1.6, and less than 0.1 branches p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat Capacity and Thermodynamic Functions of Sodium Metaborate from 5 to 350°K.George Grenier and Edgar F. Westrum Jr.Cite this: J. Am. Chem. Soc. 1956, 78, 24, 6226–6227Publication Date (Print):December 1, 1956Publication History Published online1 May 2002Published inis…
Abstract The gross dispersion of carbon black (or of other particulate fillers) in rubber can be measured quantitatively by cutting thin sections and examining them under the light microscope. The method is very suitable for control of mixing processes either in the factory or the compounding laboratory.
When graphite is bombarded in a nuclear reac tor ' there is a s teady deteriorat ion of the structure with product ion of interstit ial atoms, giving an increase of c dimension and decrease of a. Over a wide range of irradiation the parameter changes are linear wi th the dose. The amount of damage decreases wi th incr…
The effect of speed of evaporation, pressure, thickness, and age on the reflectance of evaporated Al films was investigated in the extreme ultraviolet from 900 A to 2200 A. High speed of evaporation was found to be the most important factor in producing Al films of highest ultraviolet reflectance. By changing the evap…
Abstract Long spacing order in the fiber axis direction is found for the majority of viscose rayon yarns, varying in repeat spacing from about 170 to 220 A. This order is interpreted as a regularity of crystallite placement such that the crystallites themselves act as diffracting centers to form a line lattice with lo…