Materials Literature
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Abstract Electron microscopic examination of stretched thin films of black loaded vulcanizates of SBR and polybutadiene blends shows that vacuole formation is prevalent when the polybutadiene content drops below one-third. The vacuoles that formed on stretching these stocks did so at small coherent carbon black agglom…
Mossbauer spectra were measured on Ca2Fe2O5, Ca2Fe1.5Al0.5O5, Ca2FeAlO5, and Ca2Fe0.67Al1.33O5 at temperatures from 95°K to above the Neel points. The Mossbauer spectrum of Ca2Fe2O5 below its Neel point shows lines which were assigned to tetrahedral and octahedral site ferric ions on the basis of the observed isomer s…
Single crystals of AgI in the form of hexagonal prisms up to 20 mm in length and 2 mm in diameter can be grown by slow diffusive dilution of a solution of AgI in concentrated aqueous KI solution. The crystals are of good quality and have very small concentrations of potassium impurity.
The initial steady-state electrode potential of mild steel in a vigorously aerated salt solution is believed to be a type of potential not previously described in that, for a given type of surface preparation of metal, it is wholly controlled by the nature and concentration of the anions in solution. It is a function…
The structural change of the jersey loop upon yarn swelling is related to the amount of expected laundering shrinkage in cotton jersey fabric by introducing a three-dimen sional loop model. The lengthwise shrinking is explained by the geometry of loop migration and curvature changes upon wetting and drying of the fabr…
Diffuse-reflectance spectra are reported for 11 rare-earth oxides of various structural types over the spectral range of 225–2700 mμ. These spectra, particularly in the near infrared, permit the use of diffuse-reflectance spectroscopy to identify rare-earth ions in solid materials.
Abstract To sum up our findings on the requirements for rubber blends with vulcanizate properties arithmetically interpolated between those of the constituent rubbers one needs: (a) Rubbers which have similar values of solubility parameter and which also yield blends whose vulcanizates exhibit a single glass transitio…
A model of concentric circular dislocation loops is used to examine the Hall-Petch relation. For a given critical stress concentration at the grain boundary, the Hall-Petch slope produced by this model is higher than that from either single or double-ended pile-ups of infinite straight dislocations. The minimum stress…
Abstract A new electron microscope technique permits study of the heterogeneity of elastomer blends and filler distribution therein. Vulcanizates are embedded with a specific monomer system which is subsequently polymerized. Specimens are then sectioned with an ultramicrotome and examined in the electron microscope. E…
Abstract An x‐ray investigation of the products formed by the action of caustic soda on different samples of cellulose and those formed on the decomposition of these products by aqueous reagents and alchols shows that the fundamental reacting unit is a sheet of cellulose chains, and not individual cellulose chains. Al…
In principle, the refinement of a pseudosymmetric structure starting from an idealized high-symmetry structure is impossible by routine methods of analysis, such as least-squares, even when the atomic displacements are very small. A much more helpful approach is by a method of successive approximations. This uses firs…
Measurements of resistivities of dilute iron based alloys show strong deviations from. Matthiessen's rule. These deviations can be explained by a model in which spin ↑ and spin ↓ electrons conduct in parallel. The results are consistent with the theory of impurity shielding in these alloys.
It has been discovered that bubbles can be nucleated in a metastable liquid (superheated, supersaturated with dissolved gas, or under hydrostatic tension) by gently rubbing together two solid surfaces immersed in the liquid. The mechanism of the effect is still being investigated, but some interesting results have alr…
Vibrational characteristics of composite shells, noting effects of circular joint connecting two components
An experiment is described in which fully developed turbulent channel flow of mercury was investigated in the presence of a uniform transverse magnetic field. The channel test section was constructed from an electrical insulator and was rectangular in cross section. The flow was studied in the range of Reynolds number…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisproportionation of organic polysulfidesTimothy L. Pickering, K. J. Saunders, and Arthur V. TobolskyCite this: J. Am. Chem. Soc. 1967, 89, 10, 2364–2367Publication Date (Print):May 1, 1967Publication History Published online1 May 2002Published inissue 1 May 1967https://pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnion exchange and a selectivity scale for elements in sulfuric acid media with a strongly basic resinF. W. E. Strelow and C. J. C. BothmaCite this: Anal. Chem. 1967, 39, 6, 595–599Publication Date (Print):May 1, 1967Publication History Published online1 May 2002Published in…
Abstract A model nucleating agent for polypropylene crystallization is described. A series of compounds consisting mainly of organocarboxylic acid salts is evaluated as heterogeneous nucleating agent for polypropylene crystallization by measuring their effect upon the polymer supercooling. Sodium benzoate and basic al…
The key features of the complete, stable nickel—carbon phase diagram have been established at pressures up to 54 kbar, and these features have been directly related to the nucleation and growth characteristics of diamonds in this system. At pressures in excess of 52.5 kbar, a liquid+graphite+diamond eutectic is formed…
Abstract Aromatic polyimides were prepared from pyromellitic dianhydride and a number of aromatic diamines. The effect of certain variables on the polymerization to, and the degradation of, the intermediate polypyromellitamic acids was studied, and a previously unrecorded reaction intermediate was isolated and identif…