Materials Literature
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Abstract Bei der spontanen Polymerisation des Phenylisocyanids bei Raumtemperatur entsteht neben Harzen ein blauer Farbstoff, der isoliert und als Indigo‐dianil erkannt wurde. Substituierte und homologe aromatische Isocyanide liefern, wenn überhaupt, nur Spuren analoger Farbstoffe. Der Mechanismus dieser neuen, einfac…
Abstract In this paper the influence of different molecular parameters on the dielectric characteristics of amorphous high polymers has been examined. The dielectric behaviour has been compared for several polymers which carry the same dipole in the side chain, but which differ in the flexibility of the main chain (po…
An investigation has been made into the variation in shape of the loadelongation curve of undrawn polyhexamethylene adipamide (nylon 6.6) filaments with change in ambient conditions, isotropic refractive index of the undrawn filament and speed of extension at low speeds of extension (0.008cm/sec–0.43cm/sec). The inter…
A method of growing gray tin single crystals from a liquid amalgam is presented together with a description of the apparatus and specification of the conditions of growth. Photographs of typical crystals ranging in size up to 2 cm and showing well-developed crystallographic planes are included. Residual resistance mea…
A thermodynamic study of the uranium-oxygen system, primarily in the single phase region UO2–UO2.20, has been made at temperatures of 1150° to 1350°K. An electrochemical technique was used to obtain emf measurements on uranium oxide half-cells. The cells were of the type Fe, FeO|(ZrO2+CaO)|UO2+x, Pt where x varied fro…
Abstract Kinetic runs were performed at two temperatures with ϵ‐caprolactam–water mixtures containing from 5 to 10 mole‐% of water. The concentrations of unconverted lactam x and endgroups c were determined, and in some cases also the concentration of aminocaproic acid u 1 and the quantity of cyclic oligomers formed.…
Hydromagnetic equilibria are obtained for a variety of situations which differ little from that of a zero pressure uniform axial magnetic field. Criteria for ascertaining the stability of these equilibria are found by means of an energy principle. In particular, if helically invariant fields are present, stable equili…
Using a Ag/AgCl (KCl–NaCl) reference electrode, the standard electrode potentials of the systems Tl/TlCl (KCl–NaCl), Cu/CuCl (KCl–NaCl), Cu/CuCl 2 (KCl–NaCl), Cr/CrCl 2 (KCl–NaCl), and Cr/CrCl 3 (KCl–NaCl) were measured and found to be: 0.650 volt at 680 °C, and 0.250, −0.175, 0.755, and 0.423 at 700 °C. respectively.…
The formation of regular, continuous, straight, lowangle boundaries (striations) during freezing of a metallic crystal may be avoided by inclination of the advancing solid: liquid interface with respect to the direction of freezing. (auth)
Abstract Results of research on the dielectric losses and polarization of polymers are presented. In the first and second parts of the paper these behaviors of the polymers are considered for high‐elastic state. The dielectric losses are shown to be of relaxation character since they can be described by the segmental…
The polarization behavior of surfaces containing regions which exhibit different overvoltage parameters for the same reaction are described. Also, the effect of cathode area fraction on corrosion potential and corrosion rate is considered for a corroding surface controlled by activation polarization. It is shown that…
The potassium bromide disc technique is being used for rapid, simple, and reproducible measurement of the infrared spectra, of modified cotton fibers, yarns, and fabrics. Ap plications of the procedure have demonstrated that chemical modification can be readily detected and identified and that the extent of treatment…
The Lorenz number of the semiconductor Bi 2 Te 3 has been evaluated, for the range of partial degeneracy, from data provided by the measurements of electrical conductivity and thermoelectric power. The calculated electronic component of the thermal conductivity, for p-type material, has been found to agree with the ex…
Experimental results obtained by studying the low temperature creep behaviour before and after a small stress change are interpreted in terms of barriers due to intersecting dislocations. Using the data available on the temperature dependence of the flow stress in conjunction with these experimental results, estimates…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Differential Thermal Analysis of Perchlorates. II. The System LiClO4–LiNO3Meyer M. MarkowitzCite this: J. Phys. Chem. 1958, 62, 7, 827–829Publication Date (Print):July 1, 1958Publication History Published online1 May 2002Published inissue 1 July 1958https://pubs.acs.org/…
Single crystals of the rare-earth orthoferrites (MFeO/sub 3/) have been prepared and their magnetic properties measured from room temperature to 1.3 deg K for M = Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. (L.T.W.)
Considerable structure has been observed at the intrinsic optical absorption edge of annealed films of BaO, BaS, BaSe, BaTe, SrO, SrS, SrSe, and SrTe at -160\ifmmode^\circ\else\textdegree\fi{}C. Photoemission measurements allow an estimate to be made of the energy separation between the top of the valence band and the…
The magnetic, electrical and optical properties of the 3d metal oxides are examined for clues to the energy band structure. A tentative energy band scheme is proposed for the oxides of scandium, titanium and vanadium which suggests that the nonbonding 3d orbitals of neighboring cations overlap sufficiently to form a 3…
Electron spin resonance at 3.2 cm has been observed from copper(II) in single crystals of copper(II) bis-acetylacetonate diluted to ½ mole % with palladium(II) bis-acetylacetonate at 77°K and 300°K. The parameters of the spin Hamiltonian have been expressed in terms of the atomic orbital coefficients of molecular orbi…
The first six coefficients in the expansion of the susceptibility χ, and its inverse, χ −1, in ascending powers of the reciprocal temperature, have been determined for the Heisenberg model of a ferromagnetic, for any spin value, S, and any lattice. The first five coefficients appropriate to the magnetic specific heat,…