Materials Literature
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Abstract A study of polyethylenes and ethylene–vinyl acetate copolymers by dynamic mechanical mesurements gives new information on the transitions in polyethylene polymers. The melting points agree with the predictions of Flory's theory. The alpha transition is shown to be due to the melting of crystallites containing…
A method of embedding biological specimens in araldite 502 (Ciba) has been developed for materials available in the United States. Araldite-embedded tissues are suitable for electron microscopy, but the cutting qualities of the resin necessitates more than routine attention during microtomy. The rather high viscosity…
This investigation has sought to determine the significance of the wide range of extractable collagen fractions which appear to exist in growing connective tissues and to determine their position in the process of fibrogenesis. Carrageenin granulomata were induced in guinea pigs and, after injection of (14)C-glycine,…
Abstract There is need of an economical and safe method of disposing of radioactive waste produced by nuclear reactors. A method for the incorporation of fission products into glass is being studied at Chalk River. Class containing up to 50 curies of fission products per kilogram has been made during the investigation…
Abstract The changes occurring in fully hydrated halloysite during dehydration have been studied by X-ray diffraction at relative humidities that ranged from 0 to 100 percent. From the results of this study it has been concluded that: (1) layers dehydrate randomly, but instantaneously; (2) the diffraction from an indi…
It is well known that, during the displacement of a fluid contained in a porous medium by another less viscous one, the displacement front may become unstable: Fingers occur which proceed rapidly through the system.The Muskat–Aronofsky model of displacement in porous media, in which it is assumed that a sharp front ex…
Abstract The smectic clays from Cabo de Gata region, Almeria, Spain, are composed mainly of montmorillonite, but they contain appreciable quantities of fibrous clay minerals, some of which are of the palygorskite type. However, there also is a mineral that has properties intermediate between those of palygorskite and…
Abstract Proteins interact with montmorillonite forming mono- and poly-layer complexes. About 20 percent of the protein in a monolayer complex undergoes microbial decomposition and the X-ray pattern remains unchanged, whereas in polylayer complexes the protein undergoes extensive decomposition and the c-spacings of th…
The relation of the x-ray diagram at small angles to the preparation conditions of glass fibers from molten silicates is studied. The composition Na2O·MgO·3SiO2 is studied extensively, and fibers are also studied in which K2O replaces Na2O, and CuO and PbO replace MgO. Most of the diagrams are characterized by very in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 188. Aluminum Boride. AlB12J. A. Kohn and D. W. EckartCite this: Anal. Chem. 1960, 32, 2, 296–298Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissue 1 February 1960https://pubs.acs.org/doi/10.1021/ac…
Each time a vehicle passes over a pavement the surface is deflected and rebounds, creating temporary strain conditions for 0.01 to 0.1 sec. Information about these strain conditions can be obtained by observing the movements of the pavement under similar dynamic loading conditions. Methods used for the dynamic investi…
The system UC‐UC 2 was investigated at temperatures to 2200°C. utilizing high‐temperature X‐ray diffraction techniques. UC 2 , which has the CaC 2 structure, was shown to transform to the CaF 2 structure at 1820°C. Mean coefficients of expansion of UC, U 2 C 3 , and UC 2 were determined. The decomposition of U 2 C 3 t…
The new variable-groove-depth grating-type interferometer that was used to obtain experimental interferograms and spectra used for short and long wavelengths (λ<15 μ to λ>4 mm), together with its construction and testing, is described.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal Chelate Stability Constants of Aminopolycarboxylate LigandsJ. H. Holloway and C. N. ReilleyCite this: Anal. Chem. 1960, 32, 2, 249–256Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissue 1 February 1960https://pubs.ac…
Abstract In all polymer crystallinity determinations, the basic assumptions are made that there exist only two well‐characterized phases and that the volumes of those phases are additive. For the case of polyethylene, the specific volume of the amorphous phase cannot be measured directly and is usually obtained as a l…
Abstract The following mechanism is postulated for the copolymerization of α‐methylstyrene (or similar 1,1‐disubstituted ethylene), M 2 , at temperatures near its ceiling temperature but far below the ceiling temperature of the comonomer, M 1 . Either M 1 or M 2 may combine with a polymer chain ending in either m or m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Homopolymerization of MonoisocyanatesVictor E. Shashoua, Wilfred Sweeny, and Raymond F. TietzCite this: J. Am. Chem. Soc. 1960, 82, 4, 866–873Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissue 1 February 1960https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiation Damage in Organic Crystals. I. CH(COOH)2 in Malonic Acid1H. M. McConnell, C. Heller, T. Cole, and R. W. FessendenCite this: J. Am. Chem. Soc. 1960, 82, 4, 766–775Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissu…
SUMMARY: The normally slow rates of growth and of cellulose synthesis by certain strains of Acetobacter in static culture were accelerated greatly when these strains were cultured in shaken, indented flasks or in stirred aerated fermenters, whereby the time factor was reduced from 3–4 weeks to 2–4 days. Optimum yields…
This paper proposes two mathematical models of the plain-knitted loop, both based on the simple elastica, which can be used to describe the dimensional properties of a plain-knitted fabric.