Materials Literature
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The equilibrium stability temperatures of various micas were determined and compared at the same water pressure. Dioctahedral minerals are considerably less stable thermally than trioctahedral phases. Substitution in the octahedral layer of Ni (super 2+) for Mg (super 2+) makes very little difference, and Ga (super 3+…
Overstressed U-bends of Types 304 and 347 stainless steels were exposed to water containing chloride ions to determine the susceptibility of these steels to stress corrosion cracking between the temperatures of 165 F and 200 F. The pH was controlled at 6.5 to 7.5 and 10.6 to 11.2 for the tests. At the high pH, cracks…
A method is described for the determination of possible space groups for pseudosymmetric structures, i.e. structures derived from an idealised structure of higher symmetry by small displacements of the atoms from special positions. Conventionally, systematic absences are used to infer the presence of symmetry operator…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperiments with 4-Thiopyrones and with 2,2',6,6'-Tetraphenyl-4,4'-dipyrylene. The Piezochromism of DiflavyleneAlexander Schönberg, Mohamed Elkaschef, Michael Nosseir, and Mahmoud Mohamed SidkyCite this: J. Am. Chem. Soc. 1958, 80, 23, 6312–6315Publication Date (Print):Decem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effects of Molecular Weight on the Crystallinity of PolyethyleneL. J. Tung and S. BuckserCite this: J. Phys. Chem. 1958, 62, 12, 1530–1534Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.…
A relaxation method is used to adjust the thicknesses of the films of a multilayer in order to alter its transmission characteristics in a limited spectral region. This method is used to modify the spectral transmission of a short-wavelength pass multilayer and a broad-band dielectric mirror. The computations also fur…
It was known that solubility of irradiated polymers was not free from the effect of cyclization. On the contrary, viscosity before gel point is not affected by it and it is utilized in order to investigate the effects of high energy radiation on polymers. Intrinsic viscosity is discussed first for the case where cross…
Abstract The calcination of calcium hydroxide and of calcium carbonate (precipitated or prepared from calcium oxalate monohydrate) has been studied by determining the changes occurring in the specific surface and lattice structure during each decomposition in vacuo or in air at a series of temperatures up to 900° or 1…
The solubility and solution rates of porous glass and silica gel in nitric acid solutions at 95°, 65°, and 36° C. were determined. The solubility depends on the acid concentration, decreasing with increasing strength of free HNO 3 in accordance with the following equation: log C = ‐aN ‐ b , where C is the silica solub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Spectra and Strain in Cyclic Carbonyl CompoundsH. K. Hall Jr. and R. ZbindenCite this: J. Am. Chem. Soc. 1958, 80, 23, 6428–6432Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.acs.o…
Using neutron diffraction data, the crystal structure of gypsum has been refined by Fourier and least squares methods. The hydrogen bond distance was found to be 2.82 A rather than 2.71 A, reported previously. The hydrogen positions are consistent with those obtained from nuclear magnetic resonance. The O–H distance i…
The nonequilibrium limit of random crystallization of linear high polymers is described in this article. Expressions for crystallite size, surface area, crystallinity, and amorphous sequence distribution of crystallizable repeating units in random copolymers after cold crystallization are derived. Melting points and c…
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A metallographical investigation of manganess-aluminum system was made in the compositional range of 47% to 60% of manganese, with the results of a new hexagonal close-packed phase and a metastable tetragonal ferromagnetic phase derived therefrom. The conditions necessary for formation, structure, stability and therma…
Abstract An attractive force appears between particles suspended in solutions of macromolecules when there is neither direct interaction between two particles nor energetic interaction between particles and solute macromolecules. The magnitude of this force is of the order of the osmotic pressure of the solution of ma…
Abstract Mit Ameisensäure als Kohlenoxydquelle können ohne Druckapparatur zahlreiche verzweigte Carbonsäuren aus Olefinen, Alkoholen, Alkylchloriden oder Estern in guten Ausbeuten hergestellt werden. Die Umsetzung, die in Gegenwart von konz. Schwefelsäure stattfindet, führt bevorzugt zu tertiären Säuren, z. B. Trimeth…