Materials Literature
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Abstract The unit cell of poly(tetramethylene terephthalate) is triclinic with parameters a = 5.96 Å, b = 4.83 Å, c (fiber axis) = 11.62 Å, α = 115.2. β = 99.9, and γ = 111.3°; space group P 1 , calculated crystalline density 1.41 g/cc. The plane of the benzene ring is found to be inclined by about 15° from the fiber…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-independent method for dissecting contact and dipolar NMR shifts in lanthanide complexes and its use in structure determinationCharles N. Reilley, B. W. Good, and J. F. DesreuxCite this: Anal. Chem. 1975, 47, 13, 2110–2116Publication Date (Print):November 1, 1975Pu…
The importance of diffusion was investigated under potentiostatic dissolution conditions with wire electrodes contained in inert supports. The artificial cavities created simulated localized corrosion conditions. Current‐time behavior at voltages in excess of the critical pitting potential [>0.5V (SCE)] was examined f…
Abstract This work was undertaken to study the effect of silica filler structure on the effective crosslink density and on mechanical properties. Vulcanizates of silicone, SBR, and EPM were included in the work. A compression modulus method was used for crosslink density determination. Samples were swollen prior to me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron diffraction study of the structure of Zeise's salt, KPtCl3(C2H4).H2ORichard A. Love, Thomas F. Koetzle, Graheme J. B. Williams, Lawrence C. Andrews, and Robert BauCite this: Inorg. Chem. 1975, 14, 11, 2653–2657Publication Date (Print):November 1, 1975Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational Energy and Configurational Statistics of PolypropyleneU. W. Suter and P. J. FloryCite this: Macromolecules 1975, 8, 6, 765–776Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Published inissue 1 November 1975https://pubs.a…
Most molecular theories of nematic liquid crystals assume that the constituent molecules are cylindrically symmetric. However, although this may be a useful approximation the molecules of real nematogens are of lower symmetry; here we develop a theory for an ensemble of such particles based on a general expansion of t…
B T M Willis and A W Pryor London: Cambridge University Press 1975 pp xvi + 280 price £9.50 The scope and emphasis of this book are well described by the titles of its three main sections: theory of lattice dynamics, effect of temperature on Bragg intensities and thermal diffuse scattering. From the point of view of t…
Ionic fluxes in Na channels of myelinated axons show ionic competition, block, and deviations from simple flux independence. These phenomena are particularly evident when external Na+ ions are replaced by other permeant or impermeant ions. The observed currents require new flux equations not based on the concepts of f…
The direct transition behavior among the graphitic (hBN), wurtzitic (wBN), and zincblende (zBN) crystal forms of boron nitride is investigated as a function of temperature for pressures up to 130 kbar. At pressures in the 45 to 70 kbar range, direct transformation of both the hBN and wBN forms to the zincblende form a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic studies of cadmium- and silver-oxygen surfacesJ. S. Hammond, S. W. Gaarenstroom, and Nicholas. WinogradCite this: Anal. Chem. 1975, 47, 13, 2193–2199Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Publi…
Concentration profiles of Al 2 O 3 in diffusion couples made from sapphire and fused silica were used to determine the stable equilibrium phase diagram of the system SiO 2 ‐Al 2 O 3 . The intermediate compound mullite, 3Al 2 O 3 · 2SiO 2 , melts incongruently at 1828°± 10°C; its stable solid‐solution region ranges fro…
By a suitable combination inside the muffin-tin sphere of a radial solution to the Schrodinger equation and its energy derivative, the dependence of the APW matrix elements on the energy E used to construct the basis functions can be greatly reduced. This has a number of advantages. The authors present an application…
Although a considerable body of data exists on the parametrization of the ground-state splittings of S-state ions in crystals, relatively little progress has been made in obtaining a quantitative understanding of the mechanisms which determine these parameters. In the course of summarizing our present understanding, w…
The paper examines states in the gap in amorphous silicon and chalcogenides and their effect on photoconductivity, luminescence and drift mobility. It is supposed that carriers in an ‘ideal’ glassy semiconductor without defects would move by hopping at the band edge at low temperatures and by excitation to a mobility…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMelting Point Depression and Kinetic Effects of Cooling on Crystallization in Poly(vinylidene fluoride)-Poly(methyl methacrylate) MixturesT. Nishi and T. T. WangCite this: Macromolecules 1975, 8, 6, 909–915Publication Date (Print):November 1, 1975Publication History Publishe…
A simple technique is described for ascertaining trial models for the structures of perovskites. The method relies on an understanding of the fundamental components of the structure. Rules are given for determining trial models rapidly.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron studies on some oxides and hydroxides of cobalt, nickel, and copperN. S. McIntyre and M. G. CookCite this: Anal. Chem. 1975, 47, 13, 2208–2213Publication Date (Print):November 1, 1975Publication History Published online1 May 2002Published inissue 1 Novemb…
Single crystals of SnxGe1-xTe(x=0.75 to 0.91) have been grown by the bridgman method for ultrasonic measurements of the sound velocities and the attenuation near the transition temperature. The results can be qualitatively interpreted in terms of an electrostrictive-type coupling between strain and order parameter and…
Abstract Die derzeitigen Ansichten über Startstellen, Mechanismen und Folgeprodukte der thermischen HCl‐Abspaltung aus PVC werden kurz erörtert. Die Kinetik der thermischen Dehydrochlorierung von unstabilisiertem und mit 0,05 bis 2,0 Gew.‐% Di‐n‐octylzinn‐di‐thioglykolsäure‐2‐äthylhexylester (I) stabilisiertem PVC wir…