Materials Literature
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Abstract The postulate of geometric equivalence of the monomeric units of a tactic chain with regard to an axis (I) and the postulate that the conformation is such that the internal energy of the chain, considered as not subjected to external forces, is the lowest (II), can be applied to the prediction of the conforma…
Abstract The specific heats of isotactic and atactic polypropylene have been measured over the ranges −14 to +211°C. and −55 to +204°C., respectively. In both cases, the samples were annealed at about 140°C. and the measurements repeated, but a slight thermal degradation prevented the results from the second heating f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompetitive Catalytic Hydrogenation of Benzene, Toluene and the Polymethylbenzenes on PlatinumCharles P. Rader and Hilton A. SmithCite this: J. Am. Chem. Soc. 1962, 84, 8, 1443–1449Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published…
Apparatus for measuring ultrasonic wave velocities and hence elastic moduli by means of phase-comparison methods at frequencies as high as 500 Mc is described. Gated harmonic generators for providing pulse-modulated rf of accurately known carrier frequency and circuits for electrical coupling to resonant quartz-crysta…
The deoxyribonucleic acid of the T-even coliphages contains glucosylated and nonglucosylated 5-hydroxymethylcytosine in place of cytosine (l-6). In the case of deoxyribonucleic acid from phage T6, 72y0 of the 5-hydroxymethylcytosine residues are diglucosylated. In T2 deoxyribonucleic acid, 70% of the 5-hydroxymethylcy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Synthesis of Mono- and PolycarbodiimidesTod W. Campbell and John J. MonagleCite this: J. Am. Chem. Soc. 1962, 84, 8, 1493Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https://doi.org/10.1021/ja00867a03…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConcentrated Solutions of NaSCN in Liquid Ammonia. Solubility, Density, Vapor Pressure, Viscosity, Thermal Conductance, Heat of Solution and Heat CapacityGeorge C. Blytas and Farrington. DanielsCite this: J. Am. Chem. Soc. 1962, 84, 7, 1075–1083Publication Date (Print):April…
Electrochemical methods for predicting behavior of corrosion-resistant alloys are reviewed and analyzed on the basis of modern electrode kinetic theory. The noble metal alloy concept and other methods to increase the corrosion resistance of active-passive metals are considered in detail. The problems associated with t…
The Raman spectra of sulphuric acid, deuterosulphuric acid, chlorosulphuric acid, and methanesulphonic acid have been redetermined, and the spectrum of fluorosulphuric acid measured for the first time. The spectra of fluorosulphuric acid – sulphuric acid, chlorosulphuric acid – sulphuric acid, and fluorosulphuric acid…
Abstract Ring compounds such as trioxane, β‐propiolactone, diketene, and 3,3‐bischloromethylcycloxabutane can be polymerized only in the solid state by γ‐radiation. These ring compounds polymerize by a ring‐opening, ionic mechanism to highly crystalline, high molecular weight, linear polymers. In general, the conversi…
Optical properties of two-layer antireflection systems are discussed. Theory is applied to study the optical performance of bismuth-oxide/magnesium-fluoride bilayers. The theoretical study includes graphs and numerical tables showing the spectral reflectances for different glass substrates, the effect of film-thicknes…
The observed stability relations of enstatite, protoenstatite, and clinoenstatite were in good agreement with the findings of earlier workers. Polycrystalline preparations of MgSiO 3 polymorphs were synthesized with the aid of small additions of MgF 2 or LiF as mineralizers. At 1042°± 3°C, enstatite, the stable low‐te…
Investigations were made to study the formation of and corrosion resistance of aluminum oxide films formed by reaction between aluminum and water (or wet steam) at 98-155 C. Attention was centered largely on boehmite films. Methods used for investigation of hydrated oxide films on aluminum surfaces (involving dissolut…
The mineralogy of carbonate sediments from Campeche Bank and Bermuda has been studied by use of X‐ray diffraction techniques. The sediment mineralogy appears to be mainly controlled by the skeletal mineralogy and size of organisms living locally. Selective physical destruction and transport and selective solution of m…
M\"ossbauer measurements of ${\mathrm{Fe}}^{57}$ were made on ferromagnetic ${\mathrm{Fe}}_{4}$N, which has a face-centered cubic arrangement of iron atoms with nitrogen at the body-center position. The hyperfine fields are 345 koe for the corner Fe and 215 koe for the three face-center Fe, approximately proportional…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTON THE RELATION BETWEEN CRYSTALLIZATION RATE AND LIQUID STRUCTUREDavid TurnbullCite this: J. Phys. Chem. 1962, 66, 4, 609–613Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https://pubs.acs.org/doi/10.1021/j10…
The anomalous Hall effect and the magnetoresistance of ferromagnetic metals are investigated on the basis of the localized d-electron (or f-electron) model. First the Hamiltonian of the interaction between condition electrons and localized electrons is given, which is valid when the orbital angular momenta of localize…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Stability of Some Organic Compounds.I. B. Johns, E. A. McElhill, and J. O. SmithCite this: J. Chem. Eng. Data 1962, 7, 2, 277–281Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https://pubs.acs.org/doi…
Abstract Linear polyphenylene sulfide has been synthesized by the condensation polymerization of alkali metal salts of p ‐halothiophenols. The monomers investigated included the lithium, sodium and potassium salts of p ‐bromothiophenol and the sodium salts of p ‐fluoro‐, p ‐chloro‐, p ‐bromo‐, and p ‐iodothiophenol. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew, Highly Active Metal Catalysts for the Hydrolysis of BorohydrideHerbert C. Brown and Charles A. BrownCite this: J. Am. Chem. Soc. 1962, 84, 8, 1493–1494Publication Date (Print):April 1, 1962Publication History Published online1 May 2002Published inissue 1 April 1962https…