Materials Literature
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ABSTRACT A detailed examination of the reaction of THF with (CF 3 SO 2 ) 2 has been carried out and two prominently distinct oligomeric species have been found to be produced as intermediates during the polymerization which yields living products whose end groups consist of ions and esters in equilibrium. First, the r…
Abstract Oxo(2,3,17,18-tetramethyl-7,8,12,13-tetraethylcorrolato)molybdenum(V) was prepared from the corresponding corrole by the reaction with either molybdenum pentachloride or molybdenum hexacarbonyl. Spin Hamiltonian parameters were evaluated as g = 1.967, AMo=41.8×10−4 cm−1, and AN=2.3×10−4 cm−1. The results from…
Although a considerable number of studies have been made on the effect of heat on the properties of cellulosic materials ( 1 - 5 ), the alterations induced in the cellulose fine structure are incompletely understood. Little is known of the causes of the changes and how the changes affect physical properties of cotton…
The five elastic stiffness constants were determined for both single-crystal SmCo5 and for the commercially processed liquid-phase sintered (LPS) SmCo5 permanent magnet material. The LPS material is an aligned polycrystalline aggregate of SmCo5 crystallites oriented so that their magnetically easy c axes are approxima…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfirmation of oxygen(1-) ion formation in .gamma.-irradiated 10 M sodium hydroxide/water (oxygen-17) alkaline ice glass by electron paramagnetic resonance studiesS. Schlick and Larry KevanCite this: J. Phys. Chem. 1977, 81, 11, 1093–1095Publication Date (Print):June 1, 197…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential thermal analysis and reaction kinetics for nth-order reactionRalph T. Yang and Meyer. SteinbergCite this: Anal. Chem. 1977, 49, 7, 998–1001Publication Date (Print):June 1, 1977Publication History Published online1 May 2002Published inissue 1 June 1977https://pub…
Water trees have been experimentally grown in high molecular weight, low density polyethylene when subjected to a constant dc stress. Two major types of trees have been observed; bushy trees (one-half of a bow tie) emanating outward from microvoids and larger water channels penciling inward from the perimeter or outwa…
Résumé Les hydrates à deux couches et à une couche d'une saponite calcique ont été étudiés par infrarouge. Les résultats expérimentaux indiquent que dans l'hydrate à deux couches les molécules d'eau directement coordinées à l'ion calcium sont liées par liaisons hydrogène fortes d'une part aux atomes d'oxygène de surfa…
Abstract The resolution of 2‐methylproline and the assignment of absolute configuration to the stereoisomer has been carried out. The L‐enantiomer was obtained from the fractional crystallization of the quinine salt of (−)‐ N ‐carbobenzoxy‐2‐methylproline and the D‐enantiomer from the collected filtrates. The (−)‐2‐me…
Stripe domain patterns have been observed in a nematic liquid crystal film excited by ultrasonic waves propagating in a sandwiched glass-nematic-glass medium. The effect was found to be due to molecular reorientation induced by acoustic streaming in the nematic film. Based on a simple fluid dynamical model, we calcula…
We have measured the complex dielectric function of sputtered ZnO films over a wide frequency range (10−2–107 Hz) and over a temperature range extending from −60 to 100 °C. A detailed examination of these results reveals the contributions of band conduction and hopping conduction to the dielectric dispersion. In certa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of the NH(A3.PI., c1.PI.) radicals by electron impact near thresholdKiyoshi Fukui, Iwao Fujita, and Keiji KuwataCite this: J. Phys. Chem. 1977, 81, 13, 1252–1257Publication Date (Print):June 1, 1977Publication History Published online1 May 2002Published inissue 1 J…
Investigations of the properties of electron backscattering are surveyed with respect to the application for thickness determination of self-supporting films and of surface films (top layers) on bulk materials, e.g., in electron microscopy.
The Peierls mechanism for dislocation movement based on the formation and motion of double kinks has been investigated for a/2〈110〉 edge dislocations in MgO. Characteristic parameters of this mechanism, such as the activation energy and volume, have been calculated as a function of the applied resolved shear stress (R…
A general mixture rule, which has the correct type of phase symmetry, is proposed for estimating the properties of composites having two continuous phases. The form of this equation is different from the equations used to predict the properties of composites with one continuous phase and one dispersed phase. The propo…
Potentiodynamic cyclic polarization tests on Type 316L stainless steel, a common orthopedic implant alloy, in Ringer’s solution show considerable hysteresis and a protection potential more active than the open circuit corrosion potential. This implies that chances of repassivation of actively growing pits in this allo…
Summary Adsorption‐desorption and isotopic‐exchange isotherms for acids soils of known clay mineralogy indicated that when all the surfaœ P accessible to the solution was considered, the bonding energy for phosphate decreased exponentially with site coverage. The soils differed markedly in the quantities of surface P…
The glass-transition temperatures (T g ) of thirty-one polyamide homopolymers and copolymers of widely differing molecular structure have been determined by differential scanning calorimetry or, as fibers, by dynamic tensile property measurements, and the results have been related to molecular structure. The effect of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus-nitrogen compounds. 31. Crystal and molecular structure of a platinum-cyclophosphazene complex: cis-dichloro[octa(methylamino)cyclotetraphosphazene-N,N'']platinum(II)Robert W. Allen, John P. O'Brien, and Harry R. AllcockCite this: J. Am. Chem. Soc. 1977, 99, 12, 3…
The resistivities and activation energies of borate glasses containing oxides of both V and Fe, and both V and Cu are lower than those of glasses containing the same amounts of each TM oxide separately. Optical and ESR spectra suggest that the proportions of ions in reduced valence states are not greatly affected by m…