Materials Literature
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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.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Molecular Weight Distribution on Physical Properties of Natural and Synthetic PolymersB. L. JohnsonCite this: Ind. Eng. Chem. 1948, 40, 2, 351–356Publication Date (Print):February 1, 1948Publication History Published online1 May 2002Published inissue 1 February 194…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Apparatus for Refined Thermal Analysis Exemplified by a Study of the System p-Dichlorobenzene—p-Dibromobenzene—p- ChlorobromobenzeneA. N. Campbell and L. A. ProdanCite this: J. Am. Chem. Soc. 1948, 70, 2, 553–561Publication Date (Print):February 1, 1948Publication History…
Abstract Ten series of model filaments with increasing orientation and swelling degrees ranging between 16 and 1.2 were prepared from three viscoses containing 4, 6, and 10.5% cellulose. Their birefringence was measured and their x‐ray diagrams taken and quantitatively evaluated in order to determine the over‐all orie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Furfural Destruction in Acidic Aqueous MediaD. L. Williams and A. P. DunlopCite this: Ind. Eng. Chem. 1948, 40, 2, 239–241Publication Date (Print):February 1, 1948Publication History Published online1 May 2002Published inissue 1 February 1948https://pubs.acs.org/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of Natural and Synthetic Rubber by Infrared SpectroscopyH. L. Dinsmore and D. C. SmithCite this: Anal. Chem. 1948, 20, 1, 11–24Publication Date (Print):January 20, 1948Publication History Published online1 May 2002Published inissue 20 January 1948https://pubs.acs.or…