Materials Literature
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Several methods of purifying collagen were studied . The effects of particular treatments on collagen were followed by nitrogen determina tions, by electrometric t itra tion analyses, and by electrophor etic measurements.
Summary: A general expression is derived for the ultimate strength in bending of ordinary reinforced concrete and two types of prestressed concrete beams, taking into account plasticity. A method of calculating elasto-plastic deformations is developed and applied to the problem of re-distributing bending moments in co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Reaction of Aromatic Aldehydes with Aluminum Chloride and BenzeneHerbert E. Ungnade and Elbert W. CrandallCite this: J. Am. Chem. Soc. 1949, 71, 6, 2209–2210Publication Date (Print):June 1, 1949Publication History Published online1 May 2002Published inissue 1 June 1949ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of D-Galactose and Cellulose with Nitric Acid, Nitrous Acid and Nitrogen OxidesW. W. Pigman, B. L. Browning, W. H. McPherson, C. R. Calkins, and R. L. LeafCite this: J. Am. Chem. Soc. 1949, 71, 6, 2200–2204Publication Date (Print):June 1, 1949Publication History Pu…
A bstract A study was made of the ‐decomposition of the micas muscovite, phlogopite, biotite, and lepidolite and of the vermiculite Jefferisite. Decomposition was effected by heat, water vapor under pressure, and electrodialysis. The changes were generally detected by X‐ray methods supplemented by water‐loss determina…
Thin films of germanium have been evaporated on glass, quartz, and calcium fluoride slides. The thickness of these films ranged from 4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$ to 1\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ cm. Transmission of infra-red light through the films exhibited…
Practical considerations emphasize the desirability of formulating an adequate equation of state for polystyrene. A fairly satisfactory one is this simplified version of van der Waals' equation, (P+π)(V−ω)=nRT,where π is the internal pressure (or cohesive energy density) and ω is the volume at absolute zero, by extrap…
By means of a density balance, the relationship between intrinsic viscosity and dilatometric properties is established for polyethylene terephthalate. The most pronounced property change associated with increasing intrinsic viscosity was observed to be the second-order transition temperature. The relationship between…
The stiffening of rubber-like materials at low temperature involves several different phenomena, sometimes with their effects superimposed. One of these is crystallization. This is a rate process which is generally very fast at high stresses and very slow at zero stress. In these experiments at temperatures near −25°C…
A bstract A comparison is made between the attack by NaOH and that by sodium silicate solutions on a borosilicate glass, a lime glass, and a lead glass. Below roughly 0.5 Na 2 O normality the rate of attack by NaOH is greater, but at higher normalities this is more than doubled in some instances by that of silicate so…
Abstract The recently developed x‐ray method of crystallinity determination is applied to products of heterogeneous acid hydrolysis of cellulose fibers. Upon treatment of viscose rayon fibers with boiling 2.5 N sulfuric acid, the crystalline fraction is increased from 39 to 49% within half an hour, and remains constan…
Abstract Natural rubber and GR‐S synthetic rubber have been vulcanized to varying degrees of cross linking through the use of disazodicarboxylates. These compounds react readily with the above unsaturated polymers in a manner which assures the formation of one cross linkage for each molecule of the disazo compound. El…
The standard equations of radioactive transformation are generalized to include the case where radioactive nuclei are subject to transformation by neutron absorption in addition to spontaneous decay. Opportunity is taken to derive the equations by a simple method which avoids recourse to the formal methods of solving…
A general treatment of the scattering of radiation by an inhomogeneous material is developed. It is shown how scattering measurements can be used to obtain the average square of the fluctuations in refractive index or electron density and a correlation function which measures the degree of correlation between two fluc…
The increased emphasis on quantitative biological studies in recent years has resulted in the widespread use of statistical methods for evaluating biological data. Much of this data is of the all-or-none type and, consequently, it is neces-sary to solve a dose-per cent effect curve. By converting doses to logarithms a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility Data for Ternary Liquid Systems. Systems of Acetic Acid, Higher Boiling Homologous Acids and Water.Donald F. Othmer and Jose. SerranoCite this: Ind. Eng. Chem. 1949, 41, 5, 1030–1032Publication Date (Print):May 1, 1949Publication History Published online1 May 2002…
Abstract Untersuchung der Verwandtschaft in den Systemen Be, Cr, Y, Zr, Mo, Hf, W, Os, Th, U mit Mg und Feststellung erheblicher Legierbarkeit mit Y, Zr, Os, Th. – Auf Grund der gewonnenen Erkenntnisse über den Einfluß des Thoriums und Zirkoniums wurden hochwarmfeste Legierungen im System Mg–Th–Zr entwickelt. Auf Grun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmulsion Polymerizations at Low Temperatures C. F. Fryling, S. H. Landes, W. M. St. John, and C. A. UraneckCite this: Ind. Eng. Chem. 1949, 41, 5, 986–991Publication Date (Print):May 1, 1949Publication History Published online1 May 2002Published inissue 1 May 1949https://doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA STUDY OF THE POLYMERIZATION PRODUCTS OF DIKETENE1,2ARTHUR B. STEELE, ALBERT B. BOESE, and MALCOLM F. DULLCite this: J. Org. Chem. 1949, 14, 3, 460–469Publication Date (Print):May 1, 1949Publication History Published online1 May 2002Published inissue 1 May 1949https://pubs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Diffraction Studies of Sodium Chloride–Sodium Bromide Solid Solutions.J. E. Nickels, M. A. Fineman, and W. E. WallaceCite this: J. Phys. Chem. 1949, 53, 5, 625–628Publication Date (Print):May 1, 1949Publication History Published online1 May 2002Published inissue 1 May…