Materials Literature
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Abstract The transport properties of gases and vapors in high barrier polymers and copolymers containing nitrile functionalities are discussed. The permeation behavior of oxygen, nitrogen, carbon dioxide, and water vapor are given in detail. Polymers containing methacrylonitrile as well as acrylonitrile units are incl…
The benzamide–succinic acid adduct (I) crystallises in space group P21/c, with Z= 2 in a unit cell of dimensions: a= 9·194, b= 5·116, c= 19·480 Å, β= 105·66°. The structure was refined from three-dimensional film data to R 0·10 (1441 reflections). The furamide–oxalic acid adduct (II) crystallises in space group P, wit…
The bond-energy bond-order (BEBO) model of chemisorption allows an estimate to be made of the interaction energy between a gaseous specie and a solid surface as a function of either bond length or bond order, i.e., the length or order of either the gas-surface bond being formed or the bond of the gaseous molecule bein…
Abstract Poly‐n‐hexyl isocyanate, prepared according to the method of Shashoua, was fractionated by a coacervation technique. Light scattering and osmometric measurements show that the molecules are enormously extended in solution and can be described in terms of the Porod‐Kratky worm‐like model. Dilute solution visco…
Using parallelogram model to the B-H characteristic of the hysteresis material, general expressions for the terminal quantities of a polyphase hysteresis machine are derived. Steady-state equivalent circuit models are developed for both the synchronous and sub-synchronous modes of operation. A comprehensive analysis o…
Electrochemical studies on the cobalt corroles indicate that they are complexes of cobalt(III); these can exist as square planar, pyramidal, or octahedral complexes. Reaction of cobalt corrole with phenyl-lithium gives a phenyl derivative of cobalt(II) corrole where the additional phenyl group is probably attached to…
Abstract A pure gold tube was found to give filmwise condensation in the absense of organic contamination in a flow sitution simulating that found in seawater conversion plants. A sensitive test for the presence of organic contamination has been developed. The gold tube, promoted by paraffinic thio‐silane or mercaptan…
The structural change of the anodic oxide film on AI was examined during the current recovery period appearing after an abrupt lowering of anodizing voltage and it was shown that an ultra-thin scctioning technique was useful in the electron-microscopt of the porous anodic films.
The crystal structure of synthetic β-dimorphite, As4S3, has been determined by a three-dimensional single-crystal X-ray study from photographic data. Crystals are orthorhombic, space group Pnma, with Z= 4 in a unit cell of dimensions a= 11·21 ± 0·02, b= 9·90 ± 0·02, and c= 6·58 ± 0·01 Å. The structure is built of As4S…
Measurements of heat capacity as a function of temperature are used to evaluate the changes in heat content of three deformed polymers during isothermal annealing treatments. The polymers investigated are the same as those used in previous studies of length recovery, viz., amorphous polycarbonate (PC) and semicrystall…
Differential capacitance measurements have been used to study mosaic lithiated nickel oxide electrodes and to obtain information concerning the potential distribution between the space charge region within the semiconductor and the Helmholtz layer in the electrolyte. Plots of 1/ C 2 vs. E have been found to exhibit li…
The electronic spectra, magnetic susceptibilities, and preliminary e.s.r. data are reported for the trigonal compounds M[N(SiMe3)2]3 where M = Sc, Ti, V, Cr, and Fe. The data are interpreted on the basis of crystal-field calculations for dn systems in D3h symmetry.
Abstract Sedimentation constant and intrinsic viscosity were measured on purified tropocollagens extracted from earthworm‐cuticle and lathyritic ratskin. A cartesian diver viscometer was used to make viscosity measurements at small shear stress and to avoid the effects of surface forces. By comparing the experimental…
When LiF crystals containing a low concentration of Mg 2+ ions are irradiated with γ-rays and then heated, five glow peaks may be observed. The intensity of dielectric absorption is used as a monitor of the state of aggregation of the Mg 2+ -vacancy pairs. It is shown that one of the factors determining the heights of…
Abstract m ‐Hexaphenyl ether, diphenyl ether, and 1,3‐bis( p ‐phenoxybenzenesulfonyl)benzene were polymerized with isophthaloyl and terephthaloyl chloride in a Friedel‐Crafts type polymerization. The polymers were endcapped with p ‐cyanobenzyl chloride or had units of 5‐cyanoisophthaloyl chloride in the backbone. They…
The structural properties of sodium aluminates (beta‐aluminas) as ionic conductors have been studied. The Al 2 O 3 ‐diagram for Al 2 O 3 above 84 mole per cent between 1100° and 1600° is described. The fabrication of closedend tubes (for use as battery electrolyte) by electrophoretic deposition is shown to give a usef…
The heat contents of the alkali silicate glasses and crystals have been measured from 25°C to melting temperature with a continuous high-temperature calorimeter.The entropy in the above temperature range is determined for the glasses and crystals of the composition R2O⋅2SiO2 (R=Li, Na, K). The free-energy change is ca…
The quantitative reliability of theoretical expressions for Hall and thermoelectric effects has been tested under thermal equilibrium conditions in high-conductivity, nondegenerate, and degenerate CdS single crystals, and under nonequilibrium steady-state and transient conditions in low-conductivity photosensitive CdS…
The crystal and molecular structure of the title compound have been determined by single-crystal X-ray analysis All non-hydrogen atoms conform to space group P2/c with a= 6·536 ± 0·007, b= 7·768 ± 0·008, c= 17·194 ± 0·017 Å, β= 108·8 ± 0·1°. Z= 2. The structure has been determined from diffractometer data by Patterson…
Les textures en éventails sont très communes entre lame et lamelle, dans les cristaux liquides cholestériques, proches de la transition isotrope. Ces textures renferment un bon nombre de disinclinaisons + π et — π arrangées selon certains motifs aisément reconnaissables. Dans une dislocation-coin, une disinclinaison +…