Materials Literature
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Abstract Samples of Ziegler‐type polyethylene containing no additives were placed in a temperature‐programmed oven, melted, and subsequently cooled at constant rates. Average spherulite size, based on the measurement of fifty spherulites, and impact strength by a falling ball method were determined for different cooli…
A general rate equation is derived for a model of a barrier scale layer being formed by a diffusion process and simultaneously being depleted at a constant rate by a secondary process. The equation, derived to satisfy rate curves for sulflde scaling of iron in hydrogen sulfide, is shown to be applicable to the oxidati…
Two mechanisms have been proposed to account for the observed large yield of secondary electrons in gaseous breakdown at high electric fields. In one of these a single ion in approaching the cathode surface creates a ``pass'' by decreasing the width of the potential barrier. In the other the increased over-all field d…
N. N. Greenwood and A. Thompson, J. Chem. Soc., 1959, 3485 DOI: 10.1039/JR9590003485
Abstract The theory of the stability of lyophobic colloids, as given by Derjaguin and by Verwey and Overbeek for the flat‐plate model or the sphere model of colloidal particles, is applied to cylindershaped colloidal particles. Anisometry was taken into account by considering the interaction between two parallel parti…
A metallographic study of the high‐temperature oxidation of titanium, zirconium, and hafnium has shown that alterations in the rate equations relating to such processes may be associated with the establishment of oxygen diffusion gradients in the surface layers of the metal. It has been shown that these diffusion grad…
Abstract Trapped free radicals are formed when polyethylene is irradiated with cobalt‐60 gamma rays in the absence of any reactive species‐oxygen, monomer, etc. The net free radical population formed increases with increasing total dose, decreasing temperature of irradiation, and increasing crystallinity of the polyme…
An alkaline solution of hydroxylamine is caused to react with the methyl esters of pectin present in sections of plant tissues to produce hydroxamic acids which, after acidification with hydrochloric acid, yield a red color upon addition of 2.5% ferric chloride solution. The test is specific and preferable to the use…
Abstract Il a été trouvé antérieurement que l'on pouvait greffer différents polymères sur le polytétrafluoroéthylène, en soumettant à l'action des radiations ionisantes ce polymère en présence de monomères vinyliques. Cependant, comme le Téflon est une substance chimiquement très inerte, aucun monomère ne peut pénétre…
The characteristic potential obtained just before decay of passivity (Flade potential) was measured for iron passivated by ferrates, nitrites, chromates, molybdates, tungstates, conc. , and by anodic polarization in . The Flade potential is linear with , of slope 0.059 up to approximately 4.5. Above this value up to 1…
Abstract Gehman cold‐flex, volume‐temperature, and stress‐temperature studies were used to investigate the low‐temperature characteristics of polysiloxane copolymers with respect to copolymer composition. A complete range of phenyl methyl‐dimethyl siloxane copolymers were examined as elastomeric compounds. Like other…
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Dans la première partie de l'article, on discute de l'anisotropie cristalline d'un certain nombre de composés d'oxydes hexagonaux contenant du baryum. En l'absence d'un champ magnétique extérieur, le vecteur d'aimantation peut être orienté dans une direction arbitraire par rapport à l'axe c. Ce comportement peut déjà…
J. C. Greaves and J. W. Linnett, Trans. Faraday Soc., 1959, 55, 1346 DOI: 10.1039/TF9595501346
Abstract : From the point of view of its importance to the understanding of the oxidation behaviour of titanium and titanium alloys, a theoretical reinvestigation is made of the defect structure of rutile with special emphasis on what is to be expected from the ideal rutile structure itself. A discussion is moreover g…
E. McLaughlin, Trans. Faraday Soc., 1959, 55, 28 DOI: 10.1039/TF9595500028
By partially substituting Sr for Pb in ceramic lead titanate zirconate compositions near the morpho‐tropic boundary, dielectric constants greater than 1300 can be obtained along with planar couplings of about 0.50. Calcium also raises the dielectric constant, but the planar coupling level is considerably lower than th…
Corrosion of stainless steels by nitric acid is determined largely by the crystallography of grain boundaries. There is preferential attack even on annealed steels. Increasing the rate of dissolution, either by an anodic current or by oxidizing cations, intensifies intergranular penetration. The same crystallographic…
R. Bonnett, R. F. C. Brown, V. M. Clark, I. O. Sutherland and A. Todd, J. Chem. Soc., 1959, 2094 DOI: 10.1039/JR9590002094
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Aromatization of Poly-1,3-cyclohexadiene1C. S. Marvel and Gordon E. HartzellCite this: J. Am. Chem. Soc. 1959, 81, 2, 448–452Publication Date (Print):January 1, 1959Publication History Published online1 May 2002Published inissue 1 January 1959https://pubs.acs…