Materials Literature
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Examination of mixtures of extremely pure silica and alumina shows that the greatest reactivity is not encountered with stoichiometric ratios to form mullite with the formula 3Al 2 O 3 . 2SiO 2 but rather with the formula 2A1 2 O 3 ‐SiO 2 , and that reactivity also depends on the crystalline modification of alumina. A…
Abstract Tensile tests have been carried out on polytetrafluoroethylene, polycaprolactam, polyvinyl chloride and polytrifluoromonochloroethylene at four temperature levels ranging from +20° to −196°C. The tensile strength of polytetrafluoroethylene increased from 1·44 × 10 3 lb./sq. in. at room temperature to 13·8 × 1…
Determinations of accessibility and total crystalline content have been made for a number of regenerated cellulose fibres. Moisture sorption has been used as a measure of cellulose accessibility, and total crystalline content has been estimated from density measurements. It is suggested that the results may be interpr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicate Esters and Related Compounds. I. Synthesis of Certain Tetraalkoxysilanes, Polyalkoxysiloxanes, Bis-(trialkoxysilyl)-alkanes and Related Intermediates1J. R. Wright, R. O. Bolt, A. Goldschmidt, and A. D. AbbottCite this: J. Am. Chem. Soc. 1958, 80, 7, 1733–1737Publica…
The phase relation and the dielectric and mechanical properties of ceramic samples on the ternary system (Ba–Pb–Ca)TiO 3 are studied. The ferroelectricity of the solid solution (Ba–Pb)TiO 3 decreases with increasing Ca concentration and disappears at about 50 mole percent of CaTiO 3 ; and then the structure changes to…
Isotopic techniques involving oxygen-18 have been used to study the processes involved in the sonochemical formation of hydrogen peroxide during cavitation in oxygen-saturated solutions. Both tracer and equilibration experiments were carried out in an all glass system with converging ultrasonic fields providing maximu…
The distortion of longitudinal pulses in elastic cylinders resulting from the effects of lateral inertia is discussed in terms of the Pochhammer treatment The experimentally observed displacement-time curve produced at one end of a steel cylinder when a small explosive charge is detonated at the opposite end is compar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular Weight and Vapor Pressure of Gaseous Boron SuboxideMilton D. ScheerCite this: J. Phys. Chem. 1958, 62, 4, 490–493Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 April 1958https://pubs.acs.org/doi/10.1021/j…
The electronic conductivity, σ e , Hall constant, R , and thermoelectric power, Θ, in α Ag 2 Te are measured as the Ag/Te ratio is varied by the use of the galvanic cell Ag|AgI|Ag 2 Te|Pt, where the e.m.f. of the cell, E , represents the position of the Fermi level relative to Ag-saturated Ag 2 Te. According as Ag is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structures of Lanthanum Dicarbide and Sesquicarbide by X-Ray and Neutron DiffractionMasao Atoji, Karl Gschneidner Jr., A. H. Daane, R. E. Rundle, and F. H. SpeddingCite this: J. Am. Chem. Soc. 1958, 80, 8, 1804–1808Publication Date (Print):April 1, 1958Publication Histor…
Trees, or fine, branching, microscopic channels extending partly or even wholly through a wall of insulation, represent a characteristic form of latent damage. This phase of dielectric breakdown has been studied in polyethylene. The phenomenon is probably similar in other dielectrics, such as rubber, where it cannot b…
The perturbation formulas for Compton scattering with radiative corrections are written as dispersion relations. The purpose is to learn something about (1) the number of subtractions that are needed in the relations, (2) the analytic continuation of the scattering amplitude into the unphysical region, and (3) the rol…
A general examination of the effects of cellulose source and conditions of acetylation on the crystalline structure of cellulose triacetate has been carried out. Heat has been shown to markedly improve the lateral order of the structure and thereby to demonstrate the existence of two stable polymorphic crystalline for…
Article Notizen: Röntgenographische Abbildung des Verzerrungsfeldes einzelner Versetzungen in Germanium-Einkristallen was published on April 1, 1958 in the journal Zeitschrift für Naturforschung A (volume 13, issue 4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIrradiation of Polyethylene. II. Kinetics of Unsaturation EffectsMalcolm Dole, D. C. Milner, and T. F. WilliamsCite this: J. Am. Chem. Soc. 1958, 80, 7, 1580–1588Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 April 195…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-Base Titrations in Nonaqueous SolventsJohn A. RiddickCite this: Anal. Chem. 1958, 30, 4, 793–805Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 April 1958https://pubs.acs.org/doi/10.1021/ac50163a027https://doi.org/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome N-Disubstituted Amides of Long-Chain Fatty Acids as Vinyl PlasticizersFrank C. Magne, Robert R. Mod, and Evald L. SkauCite this: Ind. Eng. Chem. 1958, 50, 4, 617–618Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlavopereirine, an Alkaloids from Geissospermum vellosiiNeil A. Hughes and Henry RapoportCite this: J. Am. Chem. Soc. 1958, 80, 7, 1604–1609Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 April 1958https://pubs.acs.org/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerchloric. Acid Titrations of Porphyrins in NitrobenzeneS. AronoffCite this: J. Phys. Chem. 1958, 62, 4, 428–431Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 April 1958https://pubs.acs.org/doi/10.1021/j150562a013http…
A packing of spheres is taken as a suitable model of porous media. The packing may be regular and the sphere size may be uniform, but in general, both should be random. Approximations are developed to give the volumes and surface areas of pendular rings that exist at points of sphere contact. From these, the total fre…