Materials Literature
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Abstract Die wichtigste und nahezu einzigartige Eigenschaft der makrocyclischen Polyäther („Kronenverbindungen”︁) ist ihre Tendenz zur Komplexbildung mit Alkalimetallsalzen und Salzen mit ähnlichen Kationen. Derartige Komplexe werden durch nichtgerichtete Coulomb‐Kräfte zwischen dem Kation und den negativen Enden der…
Polymer compatibility, as reviewed in this paper, will refer to the miscibility of homopolymers with each other and with random copolymers in the amorphous, noncrystalline state, with no distinction made between rubbers and glasses. This paper will not deal with mixed crystal formation in mixtures of crystalline polym…
A simple technique for agarose gel electrophoresis allowing the simultaneous separation of 15 samples in less than one hour is described. The method is very suitable for clinical routine analyses of proteins in plasma and other body fluids since a good resolution is obtained with patterns which are easy to interpret.…
Book digitized by Google from the library of Oxford University and uploaded to the Internet Archive by user tpb.
Hot workability relates to the ability of a metal or alloy to be deformed under conditions of high temperature (> O.6Tm, where Tm is the melting temperature in degrees Kelvin) and relatively high strain rates (10 -1 to 10 3 S -1 ). The two characteristics that govern hot workability are strength and ductility. In a…
The molecular weight and molecular weight distribution of a polymer can markedly affect its mechanical properties. While this has been recognized for a long time, quantitative studies have been relatively difficult to perform for a number of reasons. A major problem has been the characterization of the complete molecu…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of epoxidation of olefins by covalent peroxides of molybdenum(VI)K. B. Sharpless, J. M. Townsend, and D. R. WilliamsCite this: J. Am. Chem. Soc. 1972, 94, 1, 295–296Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inis…
Experiments in which a small gas bubble was slowly advanced towards a polished silica plate under dilute aqueous solutions have shown that “thick” equilibrium films are formed not only on clean, hydrophilic, silica, but also on methylated, hydrophobic, silica. The latter films are metastable, collapsing when disturbed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of pH in Controlled Stirred Tank ReactorT. J. McAvoy, E. Hsu, and S. LowenthalCite this: Ind. Eng. Chem. Process Des. Dev. 1972, 11, 1, 68–70Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissue 1 January 1972https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical conductivity by the bis(1,3-dithiole)-bis(1,3-dithiolium) systemFred Wudl, Darold Wobschall, and Earl J. HufnagelCite this: J. Am. Chem. Soc. 1972, 94, 2, 670–672Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissu…
The effect of grain growth on stresses in films is discussed. Grain growth generally leads to stress relaxation when the film is under a compressive stress. When the initial grain size is below a critical value, grain growth can occur by normal boundary migration and generates a tensile stress in the plane of the film…
Second-order elliptic differential equations (such as the time-independent single particle Schrödinger equation) may be solved in a finite closed disjoint region of space independently of the rest of space. The solution in all space may then be determined by solving the equations in the exterior region together with b…
It is shown that the energy of a screw disclination of strength + 1 [1] (2 π rotation of the director around the line) is reduced if the molecules are allowed to relax out of the plane perpendicular to the line. This solution has no singularity on the axis, r = 0. The calculation is done in the case of the anisotropic…
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The effect of α,ω‐polymethylenediamines NH 2 ‐ ( CH 2 ) n ‐ NH 2 ( n = 2 – 12 ) on the corrosion of iron in deaerated 6 N HCl at 25 ° was investigated by polarization measurements and colorimetric analysis of solution. The adsorption of these inhibitors at the metal/solution interface was monitored by measurement of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectra, photochemistry, and autoxidation mechanism of the sulfite-bisulfite-pyrosulfite systems. SO2-, SO3-, SO4-, and SO5- radicalsE. Hayon, A. Treinin, and J. WilfCite this: J. Am. Chem. Soc. 1972, 94, 1, 47–57Publication Date (Print):January 1, 1972Publication…
Starting from a simple atomic model giving the potential between electrons and atoms as V ( r ) = Ze 2 a s −1 / sr s with the empirical value s =fraction six-fifths, we combine the diffusion effect due to multiple collisions and the energy retardation in accordance with a modified Thomson-Whiddington law, with the sca…
Two general explanations for the Meyer-Neldel rule are described. The required correlation between the activation energy and pre-exponential factor for conductivity is shown to result by considering (i) a rectifying layer at the electrode-solid interface which produces a field dependent potential barrier through which…
Thermoluminescence (TL) and optical absorption measurements on LiF(TLD-100) show that the radiation- induced increase of TL sensitivity of this phosphor occurs in the luminescence process. New data are presented on thermally stimulated exoelectron emission (TSEE), photoluminescence (PL) and radioluminescence (RL). The…