Materials Literature
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Abstract Polymerization of 1,3‐dioxolane ( 1 ) was initiated in CH 3 NO 2 and CH 2 Cl 2 solvents with benzoylium hexafluoroantimonate (C 6 H 5 CO + SbF ), terminated with sodium ethanolate (C 2 H 5 ONa), and the endgroups were determined by using UV spectrophotometry and 1 H NMR methods. Polymers with high polymerizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen isotope effects in titanium alloy hydridesJohn Tanaka, R. H. Wiswall, and J. J. ReillyCite this: Inorg. Chem. 1978, 17, 2, 498–500Publication Date (Print):February 1, 1978Publication History Published online1 May 2002Published inissue 1 February 1978https://pubs.acs…
The study attempts to develop a theory for the penetration of a wide range of solid materials by continuous high-velocity water jets. The theory is based on a control volume analysis to determine the hydrodynamic forces acting on the solid boundaries of the cutting slot. A Bingham model is used to describe the time-de…
This paper describes the application of the equivalent index method to the design of metal-dielectric thin-film optical coatings. It is shown that, provided some simple approximations are made, metal-dielectric periods can be treated in exactly the same way as all-dielectric periods. Illustrations of the application o…
Abstract Four sepiolite deposits of different origin, which occur near Las Vegas, Nevada, are compared and described. They include a playa deposit, a valley terrace deposit, and two types of vein deposits. The physical and chemical characteristics of the four materials are described, the engineering and commercial fea…
Measurements of magnetic susceptibility, thermal expansion and electrical resistivity were carried out at temperatures ranging from 77 K to room temperature on a polycrystalline sample of the antiferromagnetic compound MnSe with rock salt structure. The curves obtained show a large thermal hysteresis and a sharp trans…
Abstract A polybenzimidazole having the structural repeat unit magnified image and designated AB‐PBI was formed into films by casting or precipitating from dilute solutions. Selected films were swollen in a plasticizing medium arid drawn about 2X. All films were dried in a vacuum oven to aid in the removal of residual…
Abstract The volume of cis‐1,4‐polybutadiene between 5 and 55°C and 1 and 3000 atmospheres was measured to within a relative error of 0.1 percent with an especially developed, bellows‐type dilatometer. The presence of a small transition near 55°C was indicated by analysis of the data and confirmed by differential ther…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn efficient synthesis of .gamma.-methylene-.gamma.-butyrolactone (.alpha.'-angelicalactone). Application to the synthesis of deoxyobtusilactone and deoxyisoobtusilactoneRichard A. Amos and John A. KatzenellenbogenCite this: J. Org. Chem. 1978, 43, 4, 560–564Publication Date…
Di-n-butyl phthalate and other dialkyl phthalates are used as carbon sources by three Nocardia sp. isolates; mono-n-butyl phthalate is used as a carbon source by an Arthrobacter sp. isolate and a Pseudomonas sp. isolate. The compounds were metabolized in these organisms by hydrolysis to the corresponding monoesters an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of photochemical transformations of cross-conjugated cyclohexadienonesDavid I. SchusterCite this: Acc. Chem. Res. 1978, 11, 2, 65–73Publication Date (Print):February 1, 1978Publication History Published online1 May 2002Published inissue 1 February 1978https://pubs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe high-spin(5T2) .dblharw. low-spin(1A1) transition in solid bis[2-(2-pyridylamino)-4-(2-pyridyl)thiazoleiron(II) dinitrate. Its dependence on time and on the previous history of the specimenG. Ritter, E. Koenig, W. Irler, and H. A. GoodwinCite this: Inorg. Chem. 1978, 17,…
A high speed photographic (106 frames per second) study has been made of the damage caused to soda-lime and borosilicate glasses by the impact of 1 mm diameter glass and steel spheres travelling at speeds up to 300 ms−1. For velocities up to 180 ms−1, in both glasses cone and radial cracks formed during the loading pa…
Tetramethylammonium tetrachlorozincate, {N(CH 3 ) 4 } 2 ZnCl 4 has been found to undergo successive phase transitions at about -112, -92, 3.3, 6.0 and 20°C and to show ferroelectricity along the a axis in the temperature range between 3.3 and 6.0°C.
The nature of Sb 2 O 5 , a matter of dispute to the present day, has now been elucidated by crystal structure analysis. The principles of coordination and connection accord with those of BNb 2 O 5 . This is the first such relationship between the pentoxide of a main group element and that of a subgroup element.
Abstract Depolymerization of poly‐ϵ‐caprolactam chips was carried out at low pressures (3–15 mm Hg) and elevated temperature (225°–270°C) in the presence of sodium hydroxide as catalyst. The effects of variation of amount of sodium hydroxide, time, temperature, and pressure on ϵ‐caprolactam yield were studied. With in…
A smoothing procedure is described which eliminates spurious details on crystallite-size distribution functions deduced from X-ray line profiles. It is based on a least-squares process with a stabilization scheme and is applied to composite specimens prepared by mixing known quantities of samples of nickel hydroxide,…
A multiple integral expansion of the Boltzmann superposition principle when applied to sinusoidal shear oscillations becomes σ(t)=γ0[G1′ sinωt+G1″ cosωt]+γ03[G3′ sinωt+H3′ sin3ωt+G3″ cosωt+H3″ cos3ωt]+γ05[0]. We have evaluated this constitutive equation with hollow cylinders of polycarbonate and polymethylmethacrylate…
The temperature variation of the separation of Shockley partials of single dissociated dislocations in Cu-6·44 at. % Al and Cu-13·43 at. % Al has been measured by means of in situ thermal cycling experiments in a high-voltage electron microscope; a weak-beam high-resolution imaging technique was used for the observati…
The intermetallic compound Fe 3 Sn 2 has been studied by Mossbauer spectroscopy and magnetisation measurements. This compound is ferromagnetic from approximately 220K to T c =657K. In this temperature range, the spin directions are close to or parallel to the c axis while at low temperature they are perpendicular to i…