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Abstract The effect of thermal history on the melting behavior of several linear polymer and copolymers of ethylene has been studied by using a Perkin‐Elmer DSC‐1 differential scanning calorimeter. Samples of film were heated above their melting point and then cooled at various rates in order to establish a known ther…
A method is described for measuring the optical absorption spectra of the crystalline and liquid phases of a transition-metal salt close to the melting point. Supercooling the liquid permits measuring both phases at the same temperature. This technique was applied to Cs3NiCl5 (mp 547°C) and CsNiCl3 (mp 758°C). It was…
Abstract We measured the rate of thermal decomposition of azobisisobutyronitrile (AIBN) from the rate of loss of 2,2‐diphenylpicrylhydrazyl (DPPH) on reaction of the free radicals formed by thermal decomposition of azobisisobutyronitrile (AIBN) in organic solvents with DPPH. There has been some doubt about the quantit…
The leachability of ion‐exchanged alkali alumino‐silicate glasses in water and in acid was shown to be a function of the stress at the surface. Alkali aluminosilicate glasses formed by ion exchange under conditions resulting in surface compression were more durable than similar unstressed alkali aluminosilicate glasse…
Abstract A general treatment is given of the methods to be used in other parts of this series for calculating the degree of chemical crosslinking in natural rubber vulcanizates from stress–strain measurements in extension and from equilibrium volume swelling measurements. Corrections are required for the presence in t…
The particle size distribution of CoFe2O4 formed by the coprecipitation method was investigated by x-ray diffraction and electron microscopy. In the x-ray diffraction method, 〈110〉 column length distributions were calculated by Warren's procedure. A particle size distribution was obtained from the 〈110〉 column length…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGaseous hydroxides of cobalt and nickelGeoffrey R. Belton and Andrew S. JordanCite this: J. Phys. Chem. 1967, 71, 12, 4114–4120Publication Date (Print):November 1, 1967Publication History Published online1 May 2002Published inissue 1 November 1967https://pubs.acs.org/doi/10.…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Melvin H. Horman, "Efficiences of Zone Plates and Phase Zone Plates," Appl. Opt. 6, 2011-2013 (1967) Export Citation BibTex Endnote (RIS) HTML Plain Te…
This paper reports the results of measurements of electrical conductivity and tracer (90Sr and 36Cl) diffusion in single crystals of SrCl2, both nominally pure and doped with the aliovalent ions Y3+ and Na+, in the temperature region 20° < T < 780°C. The conductivities for nominally pure crystals agree w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonmetal oxy- and thiofluoride saltsMax Lustig and John K. RuffCite this: Inorg. Chem. 1967, 6, 11, 2115–2117Publication Date (Print):November 1, 1967Publication History Published online1 May 2002Published inissue 1 November 1967https://doi.org/10.1021/ic50057a044Request reu…
The effect of micromechanical stress concentrations around elastic discontinuities in a glass was investigated. Specimens of glass containing porosity of controlled size and volume fraction were fabricated by vacuum hot‐pressing and strength was tested under uniaxial and biaxial stress conditions. Results were interpr…
Abstract Polyarylenepolysiloxanes with varied structure can be obtained in condensation reactions of arylenedisilanols and N ‐methylsiloxazanes. Molecular weights, viscometric properties, glass transition temperatures, and thermogravimetric analysis data are reported.
Domain patterns visible in reflected polarized light on surfaces of vanadium dioxide are described. Several x-ray reflection techniques and analysis of the reflected polarized light are used to investigate the domain structure of the low-temperature monoclinic phase of VO2. This is shown to be due to transformation tw…
SUMMARY The crystallinity and mineralogy of both the glauconite and the clay fraction of samples from six contemporary marine environments were investigated by X‐ray diffraction. In those areas where glauconite is now forming, the mineralogy and the degree of crystallinity of both the glauconite pellets and the associ…
The solubility limit of Cr 2 O 3 into Pb(Zr-Ti)O 3 was determined as about 2.2 mole % of ½Cr 2 O 3 . In a region out of the limit, three phases were found; the perovskite-type solid solution, the baddeleyite-type ZrO 2 and 2PbO·CrO 3 . By additions of Cr 2 O 3 within the limit, the tetragonality or the difference of r…
Abstract Polybutadienes made with six different catalyst systems were examined: (1) butyllithium, (2) “nickel-based”, (3) alfin, (4) “titanium-based”, (5) “cobalt-based”, and (6) free radical emulsion. The microstructure and macrostructure of the polybutadienes have been determined and are compared to the results publ…
Abstract The relationships of two measures of acidic Al contained in soil, namely KCl‐exchangeable Al and nonexchangeable acidic Al (pH 4.8 N NH 4 OAc extractable Al minus KCl‐exchangeable Al) with soil pH, clay, and organic matter content were evaluated statistically. Exchangeable Al concentrations were observed to b…
The phosphorescence of several polycyclic monoazines is more in-plane polarized in hydrocarbon solvents than in hydroxyl solvents outside the 0,0 band. The results are attributed to the solvent effect on the second-order spin—orbit coupling involving vibronic interactions between n, π* and π, π* electronic states. It…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiastereoisomeric four-coordinate complexes. III. Paramagnetic nickel(II) complexes with three asymmetric centersR. E. Ernst, M. J. O'Connor, and Richard H. HolmCite this: J. Am. Chem. Soc. 1967, 89, 24, 6104–6113Publication Date (Print):November 1, 1967Publication History P…
The core structure of a screw dislocation with Burgers vector along [111] in body-centred cubic iron was evaluated numerically using an anharmonic potential matching the second and third-order elastic properties of the material. The core radius is found to be 3 to 4 Å and the corresponding core energy per identity dis…