Materials Literature
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Abstract The possibility that the presence of several processes occurring during the crystallisation of polymers may account for anomalous constant fractional values of the Avrami exponent is reconsidered, and for various reasons rejected. Experimental isotherms exhibit systematic variations when analysed as two stage…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-catalyzed isomerization of thujopseneGarry C. Kitchens, H. U. Daeniker, Alan R. Hochstetler, and Kent KaiserCite this: J. Org. Chem. 1972, 37, 1, 1–5Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissue 1 January 1972htt…
ABSTRACT: X-ray analyses indicate that illite, smectite, loughlinite (Na20.3MgO. 6SIO2.8H20) and chlorite are present in the < 2/zm fraction of the lacustrine Green River Formation (Eocene) of Wyoming. Material amorphous to X-rays and random mixed-layer structures are present in subordinate amounts. Individual…
The effects of alloying elements on the pitting corrosion of aluminum in an 1N–NaCl solution have been studied by using binary aluminum alloys containing different amounts of alloying elements, Fe, Si, Cu, Mg, Mn, Ni, V, Cr, B, Zr, Ti and Be. Anodic and cathodic polarization curves, pitting potentials, pitting dissolu…
A total of 1150 specimens of 189 different alloys were completely immersed in surface seawater for 12 and 18 months to obtain data for comparison with deep ocean corrosion data.Corrosion rates, types of corrosion and pit depths were determined.Some highly alloyed nickel alloys, titanium alloys, silicon cast irons, spe…
Zirconium-based alloys with small additions of tin, molybdenum, niobium and aluminum are being developed as candidate materials for high-strength pressure tubes in advanced CANDU reactors. The out-reactor creep and stress-rupture properties of 12 alloys based on these elements have been determined and correlated with…
Abstract
The thermodynamics and relaxational behaviour of viscous liquids as they approach the glass transition can be duplicated by assuming quasi-independent units in the liquid of several hundred molecules, which below some characteristic temperature occur in potential energy minima. The form of the distribution of the numb…
We have measured the magnetic circular dichroism and absorption spectra of free base porphyrin, mono- and di-acid forms and a number of metalloporphyrins. Three of these, free base octaethylporphyrin, zinc and copper octaethylporphyrins have been studied in rigid media at liquid helium temperatures, the remainder as s…
An investigation was carried out to determine the orientation and the effect on tensile properties of hydrides precipitated in heat-treated Zr-2.5 wt% Nb tubing during the corrosion hydriding of internally pressurized samples. It was found that as the stress during hydriding was increased the hydrides gradually assume…
Abstract Atactic polystyrene glasses were molded at high pressures by cooling the polymer melt at pressures up to 5000 atm. Changes found in the properties of the samples included: a lower mechanical damping factor at temperatures from 50°K to 300°K; a higher compressive elastic modulus; a maximum in compressive yield…
Stress corrosion cracking of ferritic 18% chromium stainless steels in solution depends on nickel content (0–8%) as well as on heat‐treatment and cold work. Maximum susceptibility occurs at 2% Ni; alloyed manganese has a small effect; molybdenum can be detrimental. Rolling direction has little or no effect on failure…
An exact formulation is given for the inhomogeneous swelling of an elastomeric matrix containing a spherical inclusion, and is presented in a form amenable to solution for arbitrary free energy of mixing and network strain energy functions, rigid or soft inclusions, and finite or infinite matrix size. Specific example…
Abstract Domain structures of solvent‐cast films of A–B–A block copolymers of styrene‐isoprene‐styrene were studied by electron microscopy by use of the OsO 4 fixation technique. The effects of varying proportions of the two components and the casting solvent upon the domain structures were examined. It is concluded t…
A new series of gold cluster compounds has been identified. These are tri-univalent electrolytes, with the general formula (Au9L8)X3[L = PPh3 or P(C6H4Me-p)3, and X = NO3, PF6, pictate, or BF4, or ClO4].
Abstract Es wurde die Temperaturabhängigkeit der magnetischen Suszeptibilität und die paramagnetische Elektronenresonanz von 12 Elementdipyridylen untersucht. Bei den Hauptgruppenverbindungen und ScDipy 3 ist der Magnetismus infolge Spinwechselwirkung von Radikalanionen stark temperaturabhängig. In den übrigen Übergan…
The cl)'stallogral)hy oj I)eorlite has been investigated lIlaini;' by means oj transmission electron microscolY. The I)earlite was obloined by the isothermal decomposition oj 0 high pu rity elliectoid iron-carbon allstenite .
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Procedure for Eliminating and Evaluating Solvent Effects on Thermodynamic Data for Donor-Acceptor InteractionsRussell Drago, M Nozari, and Glenn VogelCite this: J. Am. Chem. Soc. 1972, 94, 1, 90–94Publication Date (Print):January 1, 1972Publication History Published online…
Abstract
Abstract Data on tensile strength and elongation at break for a series of Viton A‐HV vulcanizates are discussed. The data were obtained at various extension rates at temperatures from −5 to 230°C (25 ≲ T — T g ≲ 260°C) on seven vulcanizates having crosslink densities v e (estimated from C 1 in the Mooney‐Rivlin equati…