Materials Literature
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Abstract It has been demonstrated that the adhesion of high polymers to cellulose is a function of tack temperatures and dielectric constants, ϵ, of the polymers and of dipole moments, μ, of polar groups. A plot of tack temperature versus mirror image force , μ 1 μ 2 /,of copolymers gives an area of adhesion bounded b…
Studies have been made of an alloy 88 percent Mn-12 percent Cu. This alloy when annealed at 925°C and quenched to room temperature has a tetragonal structure of axial ratio 0.97. It has been suggested that such a structure would show twinning along the 101 and 011 planes. Verification of this suggestion is presented.
Abstract The relaxation of stress in polyisobutylene whole polymer of different average molecular weights has been investigated over the temperature range 30–100°C., and at different elongations. The shape of the relaxation curve is independent of elongation in a range of low elongations; above this range there is a g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion of Metals in Red Fuming Nitric Acid and in Mixed AcidNathan Kaplan and Rodney J. AndrusCite this: Ind. Eng. Chem. 1948, 40, 10, 1946–1947Publication Date (Print):October 1, 1948Publication History Published online1 May 2002Published inissue 1 October 1948https://do…
When impact occurs between clean metal surfaces, plastic flow of the metal usually takes place at the points of real contact, so that the pressures developed are as high as the dynamic yield pressure of the metal concerned. Early experiment show that if the surfaces are covered with a thin film of a highly viscous liq…
A method for measuring absorption and velocity of ultrasonic radiation in the frequency range from 5 to 100 Mc by use of pulse techniques is described. Results of such measurements performed on polycrystalline magnesium and aluminum as a function of frequency and grain size show that the absorption coefficient varies…
Abstract The chemical structure of a large number of linear condensation polymers is correlated with their ability to assume a polycrystalline form possessing the right degree of thermal stability, and with the possession of fiber‐forming properties. Certain structures lead to the absence of crystallinity and of fiber…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBasic Aspects of X-Ray Absorption in Quantitative Diffraction Analysis of Powder MixturesLeroy. Alexander and H. P. KlugCite this: Anal. Chem. 1948, 20, 10, 886–889Publication Date (Print):October 1, 1948Publication History Published online1 May 2002Published inissue 1 Octob…
A method is derived, using Fourier analysis, for finding the corrected distribution of intensity across an x-ray diffraction line, and the procedure is illustrated by a numerical example. The method may also be of use in spectrum analysis and statistical problems.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Nature of the Glassy State and the Behavior of Liquids at Low Temperatures.Walter. KauzmannCite this: Chem. Rev. 1948, 43, 2, 219–256Publication Date (Print):October 1, 1948Publication History Published online1 May 2002Published inissue 1 October 1948https://pubs.acs.org…
Abstract The behaviour of transitional metals in aluminium-rich alloys is of theoretical interest. From a knowledge of the system aluminium-iron-nickel (Raynor & Pfeil 1946-7 a) it has proved possible to predict the general form of the equilibrium diagram for the aluminium-rich aluminium-cobalt-nickel alloys (Rayn…
Abstract The mechanism of deformation of metals at high velocities has been studied by examining the microstructure of cylinders of mild steel, duralumin and standard silver (of composition Ag 92.5%, Cu 7.5%) of similar hardness, and of steel balls after impact on steel plates at velocities from 300 to 3830 ft. /sec.…
Abstract A description is given of the experimental technique devised to apply the method outlined theoretically in part I to the measurement of the dynamic compressive yield strength of various steels, duralumin, copper, lead, iron and silver. A polished piece of armour steel was employed as a target, and cylindrical…
Abstract It has long been known that metals may be subjected momentarily to stresses for exceeding their static yield stress without suffering plastic strain. One of the simplest methods for subjecting a metal to a high stress for a short time is to form it into a cylindrical specimen and fire this at a steel target.…
Experiments with aluminum and copper of the highest purity obtainable show that the magnetic susceptibilities of these metals are appreciably altered by cold working. The paramagnetic susceptibility of aluminum is decreased by an amount reaching approximately 15 percent of the original value, and the diamagnetic susce…
Attempts have been made to prepare new model-substances for magneto-chemical investigations. Sodium selenochromite, NaCrSe2, rubidium selenochromite, RbCrSe2, and rubidium thiochromite, RbCrS2, of high purity have been prepared by reaction of the pure elements, and a potassium selenochromite, K0.5CrSe2 or KCrSe2.CrSe2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of Systems of Calcium Stearate and Cetane as Deduced from X-Ray Diffraction PatternsR. D. Vold and Marjorie J. VoldCite this: J. Phys. Chem. 1948, 52, 9, 1424–1444Publication Date (Print):September 1, 1948Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrasonic Velocity in Some Organic Halides: Constitutive EffectsR. T. Lagemann, J. S. Evans, and D. R. McMillan Jr.Cite this: J. Am. Chem. Soc. 1948, 70, 9, 2996–2999Publication Date (Print):September 1, 1948Publication History Published online1 May 2002Published inissue 1…
A bstract The thermal behavior of kaolinite was studied by electron microscopy and X‐ray diffraction. This study has shown that hexagonal‐shaped particles persist far above the dehydration temperature of kaolinite. It was concluded that two stages of reaction represent the steps in the firing of kaolinite. First, the…
Abstract Most foam inhibitors arc insoluble. A criterion is described for selecting foam inhibitors {from insoluble liquids3which form emulsions with the liquid to be defoamed. By determining the surface tensions of the liquid to be defoamed and of the additive saturated with that liquid and the interfacial tension be…