Materials Literature
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The preparation and spectral and magnetic properties are reported for the complexes of the type Co(imidazole)6X2 and Ni(imidazole)6X2(X = Cl, Br, l, or NO3) and Cu(imidazole)4X2(X = Cl or NO3). These compounds have octahedral or distorted octahedral structures whereas the compounds Co(imidazole)2Cl2 and di-imidazolato…
For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology.
The development of an acoustical thermometer for use in graphite matrix nuclear fuel elements is described. Test results indicate that this thermometer accomplished the objective of automatically, accurately, and reliably recording temperatures of a number of sensors. The acoustical thermometer system offers a wider c…
Methylation of the terminal nitrogen atom in the planar hydrazones of aliphatic aldehydes and ketones causes a red shift in the ultraviolet absorption spectrum, readily interpreted by Hückel molecular orbital calculations using the heteroatom model for the methyl group. In ketone NN-dimethylhydrazones, Me2N·N:NR1R2, w…
Abstract The shift of phonon frequencies in anharmonic crystals is calculated self‐consistently by a canonical transformation equivalent to Cowley's quasi‐harmonic approximation. The damping of phonons is obtained from the phonon kinetic equations in the above approximation.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermochemistry of cobaltous hydroxideLewis M. Gedansky, Gary L. Bertrand, and Loren G. HeplerCite this: J. Chem. Eng. Data 1967, 12, 1, 135–137Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1 January 1967https://pubs.…
Abstract The shape of the dynamic moduli vs. temperature curves of polymers fundamentally depends on the temperature dependence of the relaxational properties of the polymers. When the frequency dependence of the reduced loss modulus is represented by an empirical function describing the dispersion peak, the distribut…
Abstract A high molecular weight poly(α‐methylacrolein) was obtaiiied with a yield of about 100% in the presence of a redox system and its strncture was investigated. It was established that the intrinsic viscosity of the polymers increases during the polymerization. It was shown that high molecular weight. poly(α‐met…
Abstract Transfer reactions of primary radicals formed by decomposition of dicumyl peroxide in atactic polypropylene–polyethylene blends give rise to the corresponding macroradicals. A mutual recombination of polypropylene and of polyethylene macroradicals leads to the formation of hybrid copolymer. From the values ob…
Recently several 6-coordinate metal complexes have been shown to exhibit a trigonal-prismatic rather than an octahedral structure. The events leading to the discovery of the new coordination geometry are placed in historical perspective. The evidence which led to assigning the trigonal-prismatic structure to many of t…
Previous article Next article Theory of Elasticity of an Anisotropic Elastic Body (S. G. Lekhnitskii)Milllard W. Johnson, Jr.Milllard W. Johnson, Jr.https://doi.org/10.1137/1009023PDFBibTexSections ToolsAdd to favoritesExport CitationTrack CitationsEmail SectionsAbout"Theory of Elasticity of an Anisotropic Elastic Bod…
Abstract La réaction d'amorçage des sulfures d'éthylène et de propylène par le naphtalène sodium, en solution diluée dans le tétrahydrofuranne, a été étudiée à −70 et à 0°C. Les polymères ne renferment pas de groupements naphtaléniques ou dihydronaphtaléniques dans la chaîne. La préparation de solutions de naphtalène…
Stress corrosion cracking tests were carried out on 0.020-in.-diameter wires under dead-weight loading in boiling solutions of MgCl2, Ca(NO3)2, and NaOH. The T430 and T434 ferritic stainless steels were immune to stress corrosion cracking in MgCl2 under conditions which caused various austenitic grades to fail in 6 to…
Abstract The effect of orientation on the temperature and strain rate ependence of the flow stress of molybdenum single crystals is investigated over the temperature range from 195 to 413°K. The values of the activation parameters Δ H, w , and v are calculated assuming that a single mechanism is rate controlling. It i…
The structure of some new complexes of tri-(2-pyridyl)amine with the chlorides and bromides of manganese(II), cobalt(II), nickel(II), copper(II), zinc(II), palladium(III), rhodium(III), and iridium(II) are discussed. Terdentate tri-(2-pyridyl)amine is recognised as a strong-field ligand (Δ= 12,820 cm.–1 with respect t…
Abstract Polyurethanes and polyureas containing long methylene chain units have been prepared from the following six series of monomer combinations; aliphatic diisocyanates with aliphatic glycols or diamines, methylene bis(4‐phenyl isocyanate) with aliphatic glycols or diamines, and p ‐xylylene diisocyanate with aliph…
The heat capacity of tetragonal GeO2 has been measured from 16 to 320°K by adiabatic calorimetry. The entropy at 298·15°K calculated from the results is 9·49 cal. deg.–1 mole–1.
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Some energy aspects of the Pm3m—Fm3m transformation of CsCl have been studied quantitatively. Effects of addition of RbCl, KCl and CsBr to CsCl on the transformation have been examined. Above a critical concentration of RbCl or KCl, the transformation becomes irreversible and at much higher concentrations the Fm3m for…
The effects of prior deformation, grain size, and grain-boundary and twin-boundary energy on the frequency of occurrence of annealing twins has been investigated. Deformed materials generally exhibit peaks in their twin frequency vs. grain size curves while undeformed materials do not. In the absence of prior deformat…