Materials Literature
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Abstract In this review paper, these types of molecular weight distribution found in typical polymers are described. It is pointed out that procedures for fractionating polymers usually yield incomplete information on molecular weight distribution unless the fractions are characterized for molecular weight. In additio…
Abstract Durch eine Erweiterung der Symmetrietransformationen für die Spindichte in Kristallen wird erreicht, daß neue Symmetriegruppen entstehen. Diese Gruppen stellen eine Verallgemeinerung der Shubnikov‐Gruppen oder magnetischen Raumgruppen dar und ermöglichen auch eine Beschreibung der Symmetrie von ebenen und räu…
The large differences in the activity of platinum‐on‐carbon anodes that could be produced by the choice of carbon indicated that an important chemical interaction existed between the platinum and the carbon surface. A chemical interaction was also indicated by electron‐spin‐resonance measurements on plain and platiniz…
Using a recently proposed concept of cell wall structure based on a multiplicity of lamellae coaxial with the cell, the effect of drying on the structure of the cell wall of bleached spruce sulphite tracheids has been examined by means of nitrogen adsorption. The data suggest that in the fully water-swollen wall there…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Interconversions of Octahedral, Planar, and Tetrahedral Nickel(II) ComplexesA. Chakravorty, J. P. Fennessey, and R. H. HolmCite this: Inorg. Chem. 1965, 4, 1, 26–33Publication Date (Print):January 1, 1965Publication History Published online1 May 2002Published inis…
Relative values of the diffusion coefficients of the systems He–Ar, Ar–Xe, and He–Xe have been determined over the temperature range 0° to 120°C by a two-bulb method. The experimental diffusion coefficients, at 1 atm pressure, can be described by the following equations: He–Ar: log10D=1.684log10T−4.2902,Ar–Xe: log10D=…
In an effort to develop new and improved polymeric materials for space application, a new series of polymers has been prepared. Some of these have shown outstanding thermal stability and good stability when exposed to ultraviolet radiation in a vacuum environment. High molecular weight polymers of the general type, ha…
With the availability of the ‘free ion’ spectrum of trivalent praseodymium, a closer analysis of the nephelauxetic effect in praseodymium complexes is made. An explanation for the greater decrease of F 2 parameter compared to F 4 and F 6 has been presented. A theoretical explanation of the two slopes resulting for the…
Abstract In an atomistic description of thermal diffusion atomic jump probabilities up and down the temperature gradient are different because of the non‐equilibrium phonon distribution. Starting from Rice's dynamical theory of diffusion this picture is applied to a one‐dimensional model (linear chain). The scattering…
Abstract The const rainment of the noncrystalline regions in polyethylene samples with various thermal and mechanical histories has been determined from measurements of the degree to which the activity of para ‐xylene sorbed in the polymer is enhanced relative to its hypothetical value in the absence of crystallites.…
Abstract The temperature dependence of the electrical conductivity and of the Seebeck coefficient of NiO samples with various Ni 3+ concentrations is determined. These samples are obtained from a nickel salt, using various decomposition temperatures. The temperature dependence of the hole concentration, p α , is calcu…
D. Nicholson, Trans. Faraday Soc., 1965, 61, 990 DOI: 10.1039/TF9656100990
The solubilities in the system CaSO 4 –NaCl–H 2 O, at 1 atm pressure and 35°, 50°, and 70°C, have been determined by approaching the solubility curves from both the undersaturation and supersaturation sides. The experimental runs are of long duration, as much as 3 months; these rates should be commensurate with those…
The influence of CaCO 3 on the hydration of 3CaO Al 2 O 3 containing about 90% C 3 A is studied with compacts of their mixtures proportioned to 0, 2.5, 10, 20, and 50 wt% CaCO 3 . The compacts are exposed to H 2 O in liquid and in vapor phase, the attendant expansion being measured as a function of time. Differential…
A hitherto undescribed form of boron can be prepared by subjecting ordinary forms of boron to pressures exceeding about 100 kilobars and temperatures between about 1500 degrees to 2000 degrees C. The new form has a density of about 2.52 g/cm(3) and yields a characteristic DeBye-Scherrer pattern. No large crystals have…
The technique of transmission electron microscopy has been used to study neutron irradiation damage and its behaviour on annealing in molybdenum. Micro-hardness tests were carried out on all specimens before thinning to obtain some indication of the relation between structural effects and the mechanical properties. Th…
The adsorption of 4‐ethylpyridine, 4‐ethylpiperidine, and very low molecular weight poly (4‐vinylpyridines) was studied in cyclohexane solutions containing hydrogen reduced steel powder. Isotherms were obtained for the monomers at 30°C. They show that an amount equivalent to monolayer formation is adsorbed at equilibr…
The adoption of as a new red ‐emitting primary in color television has stimulated investigation of a new class of phosphors obtained by appropriate substitutions in . Substitution of Y 3+ by Gd 3+ and Lu 3+ provides equally efficient hosts for Eu 3 + with no significant spectral differences. Substitution of Y 3+ by La…
Abstract The original fringed micelle model of a crystalline polymer solid assumed two phases, submicroscopical bundled chain crystals embedded in an amorphous matrix. Every macromolecule passed alternately through crystalline and amorphous regions. This model ideally represented the crystallization with highly stretc…
Stress corrosion cracking of α‐brass was studied in nearly neutral ammoniacal copper sulfate. Under the test conditions, this solution produced a thin, adherent oxide film on the brass. Microstructural studies of the fracture surfaces suggest that alternate formation and rupture of this film leads to initiation and pr…