Materials Literature
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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…
Abstract The intensities of crystalline and amorphous infrared bands of 66 and 610 nylon films were plotted against density. The curves were extrapolated to zero intensity to give revised values for the amorphous and crystalline densities which are probably more accurate than those previously used. The amorphous densi…
Thermal‐expansion data from room temperature to 1500°C. are given for a number of ceramic materials. Determinations were made with telemicroscopes on bars or rods 7 in. long
The infrared absorption spectra of LaBO3, InBO3, and ScBO3 have been observed as crystalline powders in the wavelength range from 7 to 20 microns. The borates had a B10/B11 ratio varying from the natural abundance (18/82) up to about 96/4. The four fundamental frequencies for B10 fell within the ranges, ω1 = 939, ω2 =…
The fictive temperature formalism, in which the structural state of the glass is characterized by the fictive temperature T , is very useful in the qualitative description of the effects of thermal treatment in the transformation range. Experimental data are presented which show, however, that such a one‐parameter des…
The resistivity, thermoelectric power, and magnetic susceptibility of metallic solid solutions at room temperature are reviewed, and their relation with their electronic structure emphasized. The special properties of transitional impurities are related to the emptying of their d shells.
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El empleo de molino vibrante permite reducir en 50-60ºC la temperatura de cocción, reducir la tendencia al agrietamiento del vidriado y conseguir que éste sea más opaco.
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The magnetic technique of particle size measurement based on the work of Elmore consists of a comparison of a modified Langevin curve with the observed magnetization curve for an appropriate system of ferromagnetic particles. The average magnetic moment per particle is obtained from this analysis, and the average part…