Materials Literature
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Zunyite, a rare aluminosilicate mineral of composition (OH, F)18Al13Si5O20Cl, has an unusual structure built up of Si5O16 groups of linked silicon tetrahedra and aluminium-oxygen groups of linked octahedra. The structure proposed by Pauling is verified and refined by X-ray methods, using 163 (hkO) reflections from sin…
Abstract Zusammenfassend wird über die Grundlagen der Oligomerenchemie und ihre Bedeutung für die makromolekulare Chemic berichtet, also über Synthese, Eingenschaften, Vorkommen und Isolierung aus Polykondensaten sowie das Verhalten unter Polymerisationsbedingungen; insbesondere an Hand von eigenen Arbeiten auf dem Ol…
D. J. Worsfold and S. Bywater, J. Chem. Soc., 1960, 5234 DOI: 10.1039/JR9600005234
About forty specimens of talc have been examined by X‐ray powder methods. Variations in the degree of crystallinity of the mineral have been observed, but no evidence has been obtained for polymorphic structural varieties. Single‐crystal data have confirmed the two‐layer mono‐clinic cell. Little evidence has been obta…
The data of Ryskin on diffusion of impurities into amorphous polymers appear to be consistent with the prediction of elastic continuum theory that the ratio of the entropy of activation, ΔS‡, to the enthalpy of activation, ΔH‡, is independent of the nature of the diffusing impurity. The ratio, ΔS‡/ΔH‡, depends only on…
An electrode potential study of the liquid aluminum‐silver system has been conducted with the cell in the temperature range 700°–980°C. The activities of both components, , , , and were determined for 700° and 900°C, and and for the temperature range of 700°–980°C. The activity curves are found to be similar in shape…
The surface degradation of both linear and crosslinked polymethylmethacrylate (PMM) has been studied over the surface temperature range of 550° to 910°K by means of a hot-plate pyrolysis technique. It was demonstrated that surface gasification due to the high heat flux at the decomposing PMM surface involves a depolym…
The characteristic properties of the displacement current transients obtained from ferroelectric colemanite crystals during polarization reversal are presented in detail. A phenomenological and semiempirical model of the switching mechanism is proposed. The model yields good agreement with the switching current depend…
It is shown experimentally that nitrogen-looking is appreciably stronger than carbon-locking. This is contrary to the customary assumption and it is suggested that there may be chemical as well as elastic interaction with the dislocations. Boron is found to produce even stronger looking than nitrogen. These variations…
Adsorption isotherms of hydrogen and deuterium have been measured at temperatures of 75–90 °K and pressures up to 760 mm Hg on the following six adsorbents: charcoal (2), silica gel, and Linde molecular sieves type 4A, 5A, and 13X.Deuterium was found to be adsorbed to a greater extent than hydrogen in all cases invest…
Abstract Two samples of highly isotactic polypropylene prepared by a NATTA's catalysis, have been fractionated by a column fractionation technique. Fractions having M̄ w /M̄ n ratio very small (1.14 – 1.27) have been obtained and used for the determination of [η]−M̄ n and [η]−M̄ w relations. Because of the small value…
M. A. V. Devanathan and M. Selvaratnam, Trans. Faraday Soc., 1960, 56, 1820 DOI: 10.1039/TF9605601820
The force exerted on an iron part in a magnetic field may be calculated by a number of different methods, all of which give equivalent force distributions confined principally to a surface. Seven different methods, giving rise to five different surface force intensities, are shown to result in the same total force. Ad…
Abstract The equilibrium conditions pertaining to reversible melt‐polycondensation in the polyethylene terephthalate system have been investigated at different temperatures and average DP's. Free ethylene glycol, end‐groups and monomer were determined quantitatively. The equilibrium constant K depends slightly on temp…
Abstract Die dynamisch‐mechanischen Eigenschaften eines Polyamids aus Hexamethylendiamin und Dekamethylendicarbonsäure wurden mittels freier Torsionsschwingungen bei Frequenzen zwischen 0.1 und 3 Hz in einem Temperaturbereich zwischen –180 und +60°C untersucht. Unter Konstanthaltung der mechanischen und thermischen Vo…
Les fortes variations d'intensité de la résonance magnétique nucléaire dans les alliages dilués sont dues à la variation de densité électronique Δρ créée à grande distance par les impuretés dissoutes. Aux noyaux distants de r d'une impureté, Δρ à la forme : Cte × cos ([FORMULE]) et donne lieu à un gradient de champ ay…
The cellulose-tendering properties of anthraquinone-2,7-disulfonic acid disodium salt have been successfully applied to graft various vinyl monomers onto cellulosic materials. A cellophane (or cellulose derivative) film is suspended in a solution containing monomer, solvent, dye, and water and irradiated with a 100-w.…
Abstract Bei Modellversuchen mit 3β‐Acetoxy‐Δ 5 ‐cholensäure‐methylester, 3β‐Acetoxy‐Δ 5 ‐ätiocholensäure‐methylester und O‐Acetyl‐oleanolsäure‐methylester wurde gefunden, dass die von Taschner & Liberek, l.c. beschriebene Methode der Halolyse von Carbonsäureestern mit Lithiumjodid sich für die selektive Spaltung…
Physiological factors affecting the flow and composition of bile may be divided into two gen- eral categories. First, the availability of bile salts (by hepatic synthesis and by reabsorption from the bowel) has a significant influence on the rate of bile production. The choleretic effect of natural bile salts and the…
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