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Measurements of the thermionic emission and electrical conductivity as a function of the temperature for fixed states of activation were obtained for each of the four barium chalcogenides. From the temperature dependences of these quantities the electron affinities were determined. The values obtained were 0.57 for Ba…
Abstract Polymer‐polymer interaction was used for the preparation of graft polymers of polyethylene oxide on starch. Preformed polyethylene oxide having hydroxyl end groups was converted to the chloroformate derivative and reacted with starch alkoxide. Watersoluble graft polymers were obtained free of cross linking. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel oxidative fragmentation. The formation of benzyl azide from the reaction of 1,1,4,4-tetrabenzyltetrazene with lead tetraacetateGen Koga and Jean P. AnselmeCite this: J. Am. Chem. Soc. 1969, 91, 15, 4323–4324Publication Date (Print):July 1, 1969Publication History Publi…
The excellent high-temperature mechanical properties and other desirable characteristics of polybenzimidazole (PBI) polymer systems make these systems attractive candidates for development as ablative heat-shield materials. This paper describes the formulation of several new low-density polybenzimidazole composites. T…
Abstract The effect of the room‐temperature first‐order transition on the plastic yield behavior of polytetrafluoroethylene (PTFE) has been investigated. Stress‐strain curves were measured at different strain rates and temperatures. Tensile creep under constant dead load was also measured as a function of temperature…
The set of optical constants of germanium reported by Marton and Toots, from 8 to 25 eV, have been assessed and found to be internally consistent to within ±5%. An extension of the n and k values up to photon energy of 100 eV using Hunter's k values also has been studied. The analysis consisted of an internal consiste…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of bivalent sulfur compounds-copper(II) complexesTeruaki Mukaiyama, Koichi Narasaka, and Hisao HokonokiCite this: J. Am. Chem. Soc. 1969, 91, 15, 4315–4317Publication Date (Print):July 1, 1969Publication History Published online1 May 2002Published inissue 1 July 19…
Abstract Physical characteristics of rubber network structures usually enumerated and discussed are network chain density, crosslink functionality, average chain length between crosslinks, entanglements which act somewhat like crosslinks, and free chain ends which are network defects. Chemical factors include structur…
Ac and dc conductivity, tunneling, and optical transmission and reflectance studies have been made on amorphous and crystalline (rhombohedral and NaCl) GeTe films (80 Å to 10 μ thick) prepared by evaporation and by sputtering. The crystalline films behave like a p-type degenerate semiconductor with Fermi level ∼0.3–0.…
Abstract Neu dargestellt wurde Na 3 CuO 3 durch Erhitzen von Na 2 O 2 /CuO‐Mischungen auf 630°C unter O 2 . Nach Einkristalluntersuchungen kristallisiert Na 3 CuO 3 triklin: a = 18,25 5 ; b = 16,78 5 ; c = 11,12 9 Å; α = 136,2; β = 106,9; γ = 90,6°; Z = 36.
Abstract The effect of sulfur, MBT, zinc oxide and stearic acid, either singly or in mixtures, on the DCP vulcanization of NR has been studied. In all cases DCP decomposes by a first order law, but the rate constant is higher in presence of MBT. Sulfur and MBT, separately or together reduce the crosslink density, each…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. P. Chauvineau, P. Croce, G. Devant, M. F. Verhaeghe; Recrystallization of Thin Gold Films: Inf…
Abstract The kinetics of the phase transformation of anatase to rutile was studied by means of X-ray diffraction. Samples of anatase were prepared by sulfate and chloride processes. The kinetic data could well be expressed by the equation α=1−e−btn, where α is the fraction of anatase transformed in time t, and b and n…
In electron microscopy, and particularly in small-angle electron diffraction, the electric charging of thin insulating films, which are frequently used to support specimens, has been regarded as a nuisance and techniques have been developed to minimize it. One particular phenomenon, however, has been of scientific int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductance, viscosity, density, proton magnetic resonance spectra, and glass transition temperatures of calcium nitrate tetrahydrate-cadmium nitrate tetrahydrate melts. An ideal fused salt systemCornelius T. Moynihan, C. R. Smalley, C. A. Angell, and E. J. SareCite this: J.…
The electrochemical and corrosion characteristics of Types 383, 304, and 316 stainless steel in 1N¯ H2SO4 were determined using precision potentiostatic polarization and conventional coupon exposure/weight change techniques. Factors increasing the magnitude of the critical anodic current density, Ic, are shown to have…
The thermal coefficients of refractive index have been determined for 23 commercial glasses. The interferometric procedure consisted of determining both the change of optical path of each glass with a change of temperature at a given wavelength and set coefficient of linear thermal expansion of the glass for the same…
The thermal behavior of pyrite in air was studied. A one‐step mechanism for the oxidation of pyrite to hematite exists and accounts for previously reported weight‐loss, DTA, and gas train data which implied a two‐step mechanism. Proper control of the oxidation temperature is very important in completing the pyrite oxi…
Abstract Two protein fractions, designated E1 and E3, which are required for the TPNH-dependent reduction of cytidine diphosphate 4-keto-6-deoxy-d-glucose to an intermediate (presumed to be CDP-4-keto-3,6-dideoxy-d-glucose) have been partially purified from extracts of Pasteurella pseudotuberculosis 25 VO and Salmonel…
In a brief introductory section the derivation of the Shubnikov groups and their importance in the description of the symmetries of magnetic crystals is described. The derivation of the black and white Bravais lattices and of the Shubnikov point groups and space groups is described and there is a brief discussion of s…