Materials Literature
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FeSO 4. 71-I20 crystallizes in space group _P21/c with a = 14.072, b =6.503, c = 11.041 /~, fl = 105 34', Z =4. The crystal structure had been determined from Patterson and Fourier syntheses using
1 The previously described 8-components (8, 11) are designated a,, for al-al and 8in for al-a2. The two al chains are assumed to be identical, since this fraction appears homogeneous. Direct evidence, however, is lacking on this point.
Abstract The paper reports weight loss vs temperature data for the pyrolytic decomposition of polyethylene, Polyvinylchloride; natural, styrene-butadiene and isopreneisobutene rubbers. A nonisothermal kinetic treatment is developed, based on proposals by Doyle and by Newkirk, resulting in characterization of the pyrol…
Abstract Diffusion coefficients of methane in linear polyethylene melts measured by simple sorption experiments are from 1.5 × 10 −5 to 3.6 × 10 −5 cm. 2 /sec. between 140.0 and 188.3°C. These diffusion coefficients are one‐third to one‐half those of methane in branched polyethylene melts at these temperatures. Solubi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat of Formation of Europium Sesquioxide1Elmer J. Huber Jr., George C. Fitzgibbon, and Charles E. Holley Jr.Cite this: J. Phys. Chem. 1964, 68, 9, 2720–2722Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1 Septem…
An elastic analysis of dislocations in anisotropic media has been applied to study the interaction of dislocations on intersecting {111} planes in the face-centred cubic structure. Both long-range and short-range interactions have been considered in a series of f.c.c. elements; the stability of each configuration resu…
Silver calcium alloys were made from 99.997% silver granules, with an analysis comparable to the spectroscopic standard for silver, and calcium, distilled from high purity granules (Dominion Magnesium Ltd) with a representative analysis, after distillation, of Mg 2 ppm, Fe 0.2 ppm, Si 0.2 ppm, Sr 0.2 ppm, Ba and other…
Tensile, creep, and modulus of elasticity data were determined for hot‐pressed zirconium carbide. The material was relatively impure, containing 1 to 2% nitrogen and 1 to 2% free carbon. Tension and creep properties, which were measured to 2600° C, indicated that above 2100°C the strength was 2000 psi or lower and the…
The expression for the torque in a twisted yarn is derived by summing the components of torque due to fibre tension, fibre torsion, and fibre bending. Of these three components, the sum of the last two is small compared with the torque due to fibre tension and hence the instantaneous torque L may be estimated simply b…
Summary Wyoming bentonite, Blisworth illite, and a fen peat were saturated with different proportions of calcium, magnesium, and potassium, and exchange between these cations was studied by measuring their activity ratios in dilute equilibrium solutions. With both clays the activity ratio aMg/aCa in solution was linea…
Phase equilibrium relations in the system Na 2 O‐GeO 2 have been determined using standard quenching techniques supplemented by differential thermal analysis. Two congruently melting compounds, Na 2 O·GeO 2 and 2Na 2 O·9GeO 2 , exist; the melting points are 1103°± 15°C and 1073°± 3°C, respectively. The eutectic temper…
Cold work markedly decreases the corrosion resistance of steel in acid solutions. This effect has been studied by electrochemical measurements and weight loss tests on zone-refined iron and carbon steels exposed to sulfuric and hydrochloric acids. The mechanism of this phenomenon is discussed in detail.
Three meso-tetra(o-substituted phenyl)porphins have been prepared by the Rothemund reaction, and a by-product has been isolated from one reaction mixture. The mechanism of the Rothemund reaction is discussed.
Effective research on the aesthetic characteristies of fabries is difficult because ex plicit definitions are lacking in this field. The most reliable tool is subjective evalua tion: therefore, words ( loft, clammy, hard, etc.) become important research tools. Special meanings of these words become clear if they are l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Electron Correlation in X-Ray and Electron DiffractionL. S. Bartell and R. M. GavinCite this: J. Am. Chem. Soc. 1964, 86, 17, 3493–3498Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1 September 1964https:/…
Abstract The effects of the conditions fiber formation on structural parameters and tensile properties of melt‐spun, highly isotactic polypropylene filaments were investigated to determine the feasibility of producing supertenacity polypropylene filaments. Meltspun polypropylene monofilaments were prepared from five h…
Analytical results are presented for the transient ablation performance of a high-performance castable ablation resin for which spallation is responsible for the char removal. The mechanism for the spallation process is assumed to depend upon the internal stress due to the gas pressure drop through the char and a crit…
The electrical conductivity of compositions in the system ZrO 2 ‐CaZrO 3 was examined. The composition of maximum conductivity in this system is within the cubic solid‐solution region close to the low‐calcia cubic solid‐solution phase boundary. The conductivity decreases from the single‐phase cubic solid solution to b…
The viscos ity o f a soda -lime-sili ca g lass has bce n m eas urcd a t t he Nat io na l B urcau of Stand a rd s a nd se ven oth er la bo ratories. D ete rmin atio ns wc rc mad e in t hc ra nge of 102 t o 10 15 p oises. The rotat in g cy lind er was u sed at t he hig her t em pcrat urcs (800 to 1450 C) a nd t hc fib e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Revised Theory of High Polymer SolutionsMaurice L. HugginsCite this: J. Am. Chem. Soc. 1964, 86, 17, 3535–3540Publication Date (Print):September 1, 1964Publication History Published online1 May 2002Published inissue 1 September 1964https://pubs.acs.org/doi/10.1021/ja01071a…