Materials Literature
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Abstract The solution polycondensation of 3,3′ ‐diaminobenzidine tetrahydrochloride with aromatic dicarboxylic acid derivatives in polyphosphoric acid was found to give high molecular weight polyphenylenebenzimidazoles easily. Their preparation and physical properties, such as thermal stability, solubility, crystallin…
Physical properties are presented for extruded and sintered BeO from 25° to 1400° C as a function of porosity (0 to 15%), grain size (5 to 100μ), and grain orientation (random to 80% preferred). The elastic constants and linear thermal expansion are sensitive to the degree of preferred grain orientation. Measurements…
very high angles, and only become significant if the film is photometered to this order of accuracy. These quantities may be compared with the centroid displacement and variance which have been determined previously (Pike, 1957(Pike, , 1959;; Langford, 1962) for a diffractometer with various collimator geometries.
Clinoptilolite has been investigated as a source of porous, largely crystalline, molecular sieve sorbents. By treating the zeolite with mineral acid of different strengths a range of high area sorbents has been produced, in which all the original cations have been replaced by hydronium ions, and in which the aluminum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and Molecular Structures of Some Metal TetraphenylporphinesEverly B. Fleischer, Cleta K. Miller, and Lawrence E. WebbCite this: J. Am. Chem. Soc. 1964, 86, 12, 2342–2347Publication Date (Print):June 1, 1964Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Differential Scanning Calorimeter for Quantitative Differential Thermal Analysis.E. S. Watson, M. J. O'Neill, Joshua. Justin, and Nathaniel. BrennerCite this: Anal. Chem. 1964, 36, 7, 1233–1238Publication Date (Print):June 1, 1964Publication History Published online1 May 2…
The migration energies and atomic configurations for mono- and di-interstitials and mono- and divacancies in $\ensuremath{\alpha}$ iron have been calculated using a classical model. About 530 atoms surrounding the defect were treated as individual particles, each with three degrees of freedom, while the remainder of t…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdamantane: Consequences of the Diamondoid StructureRaymond C. Fort and Paul von R. SchleyerCite this: Chem. Rev. 1964, 64, 3, 277–300Publication Date (Print):June 1, 1964Publication History Published online1 May 2002Published inissue 1 June 1964https://pubs.acs.org/doi/10.1…
Dynamic plastic behavior of materials is influenced by internally generated temperature gradients. These gradients are a function of thermophysical properties as well as strain rate and shear strength. Criteria are presented for the prediction of catastrophic shear in materials. Catastrophic shear occurs when the loca…
Abstract The internal crystalline morphology of linear polyethylenes was examined by utilising the P ALMER ‐C OBBOLD nitric acid digestion treatment. The basically lamellar morphology reported by P ALMER and C OBBOLD was confirmed in all the cases investigated which includes extreme differences in crystallization cond…
Abstract It has been discovered that when fuming nitric acid oxidises bulk samples of polythene crystallised from the melt, preferential attack on the links between the lamellar crystals occurs with the consequent release of fragments of these crystals. The reaction is not confined to the surface of samples and lamell…
Results of absorption spectra measurements on silicate glasses of various compositions indicate that ions of the first transition-metal series are present in tetrahedral and octahedral sites in silicate melts (glasses). The fractionation patterns observed for transition-metal ions between magmas and silicate minerals…
Am Beispiel der Synthese des Nickel(II)-Komplexes des (±)-1.8.8.13.13-Pentamethyl-trans-corrins wird ein synthetischer Zugang zum Verbindungstyp der Corrine aufgezeigt. Durch die mehrfache Verwendung des Triäthyloxonium-tetrafluorborats bietet die Arbeit eine Illustration der präparativen Bedeutung der von H. Meerwein…
An exact integral equation is derived for the backscattering coefficient as a function of energy and angle. The equation has an approximate symmetry which allows one to determine the conditions under which backscattering will be independent of the energy of the incident electrons. The validity of some approximations i…