Materials Literature
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Abstract E. H. Farmer compiled a review of vulcanization which was published in 1946 as an important chapter in Volume II of “Advances in Colloid Science”. About two years later, Normann Bergem published a review under the same title. These authors dealt with the subject from rather fundamental points of view, but, be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of Transport Phenomena in the Cryolite-Alumina System by Means of Radioactive TracersWilliam B. Frank and L. M. FosterCite this: J. Phys. Chem. 1957, 61, 11, 1531–1536Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Publish…
Abstract Methods of extracting potassium from soils by use of sulfuric acid have been developed. The amounts of K extracted from several Ohio and New York soils by these methods were compared with those extracted by neutral 1 N NH 4 OAc and boiling 1 N HNO 3 methods as means of furnishing a reliable index to the “plan…
Therefore it appears that purely 'mechanical' forces do not appreciably affect bond length, whereas bond angles are not as rigorous in their demands for constancy.
Phase equilibria in the binary system BaTiO 3 –SrTiO 3 were studied above 1200°C. This system is characterized by a complete series of solid solutions with a minimum at 2.5 mole % SrTiO 3 and 1585°C. The hexagonal BaTiO 3 phase is suppressed to a region extending no farther than 0.5% SrTiO 3 at 1600°C. No immiscibilit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Use of Snake-Cage PolyelectrolytesMelvin J. Hatch, John A. Dillon, and Hugh B. SmithCite this: Ind. Eng. Chem. 1957, 49, 11, 1812–1819Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Published inissue 1 November 1957https…
Abstract The degree to which a polymer is rubbery is influenced by the detailed shape and chemical composition of the macromolecules. Polymers which are rubbery possess relatively weak interchain forces and may lack linear symmetry and orderly arrangement of the molecule. As stronger interchain forces are added and sy…
A modified assignment of the PMR signals in acetylacetone is confirmed. The changes in intensity of selected signals with temperature are used to calculate an enthalpy of conversion of 2700 ± 100 cal. between keto and enol forms in pure acetylacetone.Interactions, which perturb the equilibrium between the tautomeric f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of Xylenes, Cymenes, Methylnaphthalenes and Other Isomers by Clathration with Inorganic ComplexesWilliam D. Schaeffer, W. S. Dorsey, Davis A. Skinner, and C. G. ChristianCite this: J. Am. Chem. Soc. 1957, 79, 22, 5870–5876Publication Date (Print):November 1, 1957P…
The results of a series of measurements on the x-ray reflectivity of metal films evaporated on a glass substrate are presented. Comparison of these results with theory is made and the necessity of making measurements on bulk material is pointed out if the disagreements with theory are to be eliminated.
The solubility at 25 °C. of the sparingly soluble basic copper carbonate malachite has been determined by two methods. The constancy of the calculated value of the solubility product in solutions of varying ionic strength has shown it to be a comparatively well-defined material suitable for the study of the complexing…
Abstract Natural rubber and synthetic elastomers deteriorate on aging as a result of the contribution of a number of factors. It has been generally recognized for many years that the changes in properties on aging are due primarily to the deteriorating effects of one or more of the following factors: heat, light, oxyg…
Abstract In this discussion, we have indicated that carbon blacks display both chemical and catalytic activity which appear to be sufficient to radically alter the chemistry of vulcanization. Much of the chemical reactivity results in removal of molecules or reactive intermediates which might otherwise produce crossli…
Journal Article Marine Algae of the Northeastern Coast of North America Get access Marine Algae of the Northeastern Coast of North America . Taylor William Randolph . 509 pgs., illus. The University of Michigan Press , Ann Arbor, Michigan ( 1957 ) $12.50 Harold C. Bold Harold C. Bold University of Texas Search for oth…
In treating problems of sputtering and radiation damage of solids, a billiard ball model is frequently assumed. An attempt is made to indicate to what extent such a model is justified. Using this model it is noted that the lattice structure of a crystal implies a correlation between successive collisions in a damage p…
It is shown that an excited sensitizer can transfer its energy simultaneously to two activators, under suitable conditions, leading to two emitted photons per incident higher energy photon. The probability of this transfer process is computed, and the process is shown to be experimentally feasible.
The de Haas-van Alphen effect in the magnetic susceptibility of graphite has been interpreted by applying the susceptibility formula for general bands of Lifschitz and Kosevich to the band model of Slonczewski. The majority electrons and holes are responsible for the two periods of oscillation of the susceptibility. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction Kinetics in Differential Thermal AnalysisH. E. KissingerCite this: Anal. Chem. 1957, 29, 11, 1702–1706Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Published inissue 1 November 1957https://pubs.acs.org/doi/10.1021/ac60131a045…
The effect of magnetic annealing at 375\ifmmode^\circ\else\textdegree\fi{}K on the room-temperature anisotropy of a series of six single crystals in the composition series ${\mathrm{Co}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{O}}_{4}$, in the range of $x$ values between 0.0 and 0.15, is investigated. The anneal-i…
Far infrared and millimeter microwave transmission experiments through thin superconducting lead and tin films are reported. The frequency range covered corresponds to photon energies from 0.3 to $40k{T}_{c}$. The measurements include the previously unexplored frequency region in which a superconductor changes from an…