Materials Literature
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Abstract Polyarylenepolysiloxanes with varied structure can be obtained in condensation reactions of arylenedisilanols and N ‐methylsiloxazanes. Molecular weights, viscometric properties, glass transition temperatures, and thermogravimetric analysis data are reported.
Domain patterns visible in reflected polarized light on surfaces of vanadium dioxide are described. Several x-ray reflection techniques and analysis of the reflected polarized light are used to investigate the domain structure of the low-temperature monoclinic phase of VO2. This is shown to be due to transformation tw…
SUMMARY The crystallinity and mineralogy of both the glauconite and the clay fraction of samples from six contemporary marine environments were investigated by X‐ray diffraction. In those areas where glauconite is now forming, the mineralogy and the degree of crystallinity of both the glauconite pellets and the associ…
The solubility limit of Cr 2 O 3 into Pb(Zr-Ti)O 3 was determined as about 2.2 mole % of ½Cr 2 O 3 . In a region out of the limit, three phases were found; the perovskite-type solid solution, the baddeleyite-type ZrO 2 and 2PbO·CrO 3 . By additions of Cr 2 O 3 within the limit, the tetragonality or the difference of r…
Abstract Polybutadienes made with six different catalyst systems were examined: (1) butyllithium, (2) “nickel-based”, (3) alfin, (4) “titanium-based”, (5) “cobalt-based”, and (6) free radical emulsion. The microstructure and macrostructure of the polybutadienes have been determined and are compared to the results publ…
Abstract The relationships of two measures of acidic Al contained in soil, namely KCl‐exchangeable Al and nonexchangeable acidic Al (pH 4.8 N NH 4 OAc extractable Al minus KCl‐exchangeable Al) with soil pH, clay, and organic matter content were evaluated statistically. Exchangeable Al concentrations were observed to b…
The phosphorescence of several polycyclic monoazines is more in-plane polarized in hydrocarbon solvents than in hydroxyl solvents outside the 0,0 band. The results are attributed to the solvent effect on the second-order spin—orbit coupling involving vibronic interactions between n, π* and π, π* electronic states. It…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiastereoisomeric four-coordinate complexes. III. Paramagnetic nickel(II) complexes with three asymmetric centersR. E. Ernst, M. J. O'Connor, and Richard H. HolmCite this: J. Am. Chem. Soc. 1967, 89, 24, 6104–6113Publication Date (Print):November 1, 1967Publication History P…
The core structure of a screw dislocation with Burgers vector along [111] in body-centred cubic iron was evaluated numerically using an anharmonic potential matching the second and third-order elastic properties of the material. The core radius is found to be 3 to 4 Å and the corresponding core energy per identity dis…
A Hall effect measurement technique is described which overcomes some of the difficulties presented by materials combining a small Hall angle with a large temperature coefficient of conductivity. The major problem of `offset' voltage suppression is dealt with by using a direct primary current in conjunction with an al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProof of structure of the colored photoproducts of chromenes and spiropyransJaroslav Kolc and Ralph Sherman BeckerCite this: J. Phys. Chem. 1967, 71, 12, 4045–4048Publication Date (Print):November 1, 1967Publication History Published online1 May 2002Published inissue 1 Novem…
Single crystals of R2S3, R = Dy, Gd, Nd, and Y, have been grown by flame fusion in an argon plasma torch and by the Bridgman technique. The purification of R2O3 starting materials, synthesis and analysis of compound powders R2S3, crystal growth, analysis to determine if single crystals are produced, and measurement of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of crystallization temperature and molecular weight on the melting temperature of linear polyethyleneM. R. Gopalan and Leo MandelkernCite this: J. Phys. Chem. 1967, 71, 12, 3833–3841Publication Date (Print):November 1, 1967Publication History Published online1 May 200…
The magnetic relaxation times T1 for 14N and 2D in liquid CD3CN have been measured as functions of temperature and concentration of added ionic salts. With no model assumed for the reorientation process, the molecular rotation is demonstrated to be anisotropic. The further assumption of a rotational diffusion equation…
Article Untersuchungen zur Kristallstruktur und magnetischen Struktur des Ferberits FeWO4 was published on November 1, 1967 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 124, issue 1-6).
Nonaxial paramagnetic resonance spectra in Ce-doped CaWO4, with and without sodium compensation, have been observed and the g parameters measured. It is suggested that the compensation-site g ellipsoids can be largely explained as a perturbation of the axial-site g ellipsoid caused by the odd fields of the compensatin…
Solubilization and reconstitution is one of the key steps in the purification of fibrous proteins and in the clarification of certain of their physical properties. Since the description of amyloid as a
Room temperature measurements of the Seebeck coefficient (α), electrical conductivity (σ), thermal conductivity (κ), and thermoelectric figure of merit (Z) were made on samples of n-type Bi 2 Te 3 –Bi 2 Se 3 pseudobinary alloys over the whole composition range. To obtain maximum Z, doping was carried out at each compo…
Using a thermobalance, the oxygen content of urania containing small amounts of yttria or lanthana was determined as a function of the oxygen partial pressure at 1100° to 1400°C. Values for the partial free enthalpy, the partial enthalpy, and partial entropy of oxygen were calculated. Equilibrium oxygen pressures over…
A theoretical analysis of the load-elongation behavior of idealized plain-weave fabrics subjected to biaxial stresses is presented. Fabric strains resulting from both crimp interchange and yarn extension are considered. The analytical expressions de rived have been solved with the aid of a digital computer for both li…