Materials Literature
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Abstract The action of methyl alcohol on pyridine in the vapour phase in contact with alumina or aluminium silicates gives methylpyridines, including the commercially valuable β‐picoline. The separation of this base from the other homologues of similar boiling‐point can be effected by taking advantage of the fact that…
Much progress in the understanding of the mechanical properties of high polymeric substances has been made in the past few years. The theory of the mechanical properties of rubberlike systems has been developed by Guth, James, Gee, Treloar, and others; those of fiberlike materials have been studied by Mark, Harris, Ey…
A simple and accurate method of determining pole figures by using a special sample mount with a Geiger counter x-ray diffraction goniometer is described and examples given. Also, a correction formula is derived which takes into account absorption change and change in diffracting volume as the sample changes position w…
A bstract The current theories of glass formation deal mainly with inorganic substances containing oxygen as the negatively charged component. A distinction has been made between those positively charged components which are considered as essential for the formation of the continuous network and those which fit into t…
Abstract Poly‐4‐vinylpyridine was precipitated from a toluene solution of the monomer after addition of benzoyl Peroxide. The sample used in these experiments had a molecular weight of 77,000, (DP 730) as determined by osmotic pressure in alcohol solution, and an intrinsic viscosity of 0.36 in this solvent. The hydroc…
Abstract The absorption spectra of some crystalline and oriented solids have been measured using planepolarized infra-red radiation. The sample was examined successively with the direction of orientation of the crystals parallel or perpendicular to the direction of vibration of the electric vector in the polarized inc…
It is pointed out that Peierls' condition for the validity of time-dependent perturbation theory in the determination of the mobility $\ensuremath{\mu}$ of electrons in crystals can be transformed to the form $\ensuremath{\mu}>30 \frac{{\mathrm{cm}}^{2}}{\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{t}\ensuremath{-}\mathrm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Epoxy Compounds. VI.2 Thermal Polymerization of the Isomeric 9,10-Epoxystearic Acids1aDaniel Swern, Geraldine N. Billen, and C. Roland EddyCite this: J. Am. Chem. Soc. 1948, 70, 3, 1228–1235Publication Date (Print):March 1, 1948Publication History Published onli…
Kalsilite, the simplest of the three known polymorphous forms of KAlSiO4, was isolated in minute quantities from volcanic rocks of S.W. Uganda in 1942 (Bannister & Hey, 1942) and synthesized in the laboratory for the first time in 1947 (Rigby & Richardson, 1947).
Abstract An analytical method is developed for determining the natural frequencies of a composite system which consists of a uniform beam with a concentrated mass, spring, and dashpot attached at any point along the length of the beam. The method makes use of a series expansion in terms of the set of orthogonal functi…
Abstract 1. Das System NaCl/MgCl 2 wird nachgeprüft und die Zusammensetzung der Verbindungen als NaMgCl 3 und Na 2 MgCl 4 sichergestellt. 2. Das System KCl/MgCl 2 wird thermoanalytisch und röntgenographisch untersucht; es treten die kongruent schmelzenden Verbindungen KMgCl 2 und K 2 MgCl 4 auf. 3. Eine vorläufige Unt…
Several commercial carbon blacks were examined with dark-field illumination in the electron microscope. Anomalous intensities in the dark-field images are interpreted as resulting from coherent scattering by parallel layer groups of graphitic planes, which were previously identified by Biscoe and Warren using x-ray di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of Internal Double Bonds in Polymers by Per-benzoic Acid AdditionAlfred Saffer and B. L. JohnsonCite this: Ind. Eng. Chem. 1948, 40, 3, 538–541Publication Date (Print):March 1, 1948Publication History Published online1 May 2002Published inissue 1 March 1948https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular Weight of Lysozyme Determined by the X-Ray Diffraction MethodK. J. Palmer, M. Ballantyne, and J. A. GalvinCite this: J. Am. Chem. Soc. 1948, 70, 3, 906–908Publication Date (Print):March 1, 1948Publication History Published online1 May 2002Published inissue 1 Ma…
A number of experiments directed toward determining the nature and cause of deposits which occur on electron microscope specimens under electron bombardment are described. From these the conclusion is drawn that the material is a result of chemical reaction, occurring at any surface simultaneously bombarded by electro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmulsion Polymerization of MyrceneA. J. Johanson, F. L. McKennon, and L. A. GoldblattCite this: Ind. Eng. Chem. 1948, 40, 3, 500–502Publication Date (Print):March 1, 1948Publication History Published online1 May 2002Published inissue 1 March 1948https://pubs.acs.org/doi/10.1…
The well-known discrepancy between the calculated value of the eddy-current losses in electrical sheet steels at supply frequencies and the experimentally observed value is discussed. The effect of the flux waveform distortion due to magnetic non-uniformity of laminations is examined experimentally and found to be sma…
The factors which affect the textile quality usually known as resilience are discussed, and a normalized co efficient is derived which quantitatively expresses the degree of resilience of textile fibers. Use of the term "elastic performance," rather than "resilience," is sug gested. The dependence of elastic performan…
Abstract Precise analytical methods are developed using iodine monochloride for the determination of unsaturation in polybutadiene and polyisoprene and their copolymers with styrene. The complicating side reactions, splitting out and substitution, as well as the influence of the solvent employed are investigated in de…
(1948). 4—THE HEMICELLULOSES OF JUTE FIBRE. Journal of the Textile Institute Transactions: Vol. 39, No. 2, pp. T44-T58.