Materials Literature
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Abstract The tensile properties of high and low density polyethylene specimens produced under careful crystallization and annealing procedures have been determined. A morphologically controlled brittle‐ductile transition has been observed for high density polyethylene. Although the lamellar thickness appears to determ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and structure of tri-.mu.-halogeno-hexacarbonyldirhenate(I) salts of monocationic porphyrin acidsC. P. Hrung, M. Tsutsui, D. L. Cullen, E. F. Meyer Jr., and C. N. MorimotoCite this: J. Am. Chem. Soc. 1978, 100, 19, 6068–6076Publication Date (Prin…
An elastic analysis of dislocations in isotropic media has been applied to study the interaction of dislocations on intersecting {111} planes at a coherent twin boundary in the face-centered-cubic lattice. The nature of energetically favorable barriers formed by such reactions is determined and their equilibrium separ…
Six vinyl phosphonates have been synthesized and evaluated as grafts on poly(ethylene terephthalate) for their flame retardance properties. Diethylvinyl phosphonate was used as a model for phosphorus-containing flame retardants in developing the methodology for localizing flame retardants either on the surface of the…
Fourier transform infrared spectra (3800 to 450 cm −1 ) and laser Raman spectra (4000 to 0 cm −1 ) of crystalline phenylsilanetriol and phenylsilanetriol-d 3 , and liquid state phenylsilanetriol and phenylsilanetriol-d 3 are first reported. Complete band assignments are attempted. All vibrational modes of the SiOH gro…
The mixed‐alkali effect on chemical durability was evaluated for bulk and powdered Na 2 O‐K 2 O‐CaO‐SiO 2 glasses. Two contributions to this effect are discussed, i.e. those of glass structure and corrosion solution. The magnitude of the mixed‐alkali effect depends on the pH of the corroding solution. For pH<9, alk…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic Properties of Linear Polymers with High Molecular Weights and Sharp Molecular Weight DistributionsYoshinobu Isono, Teruo Fujimoto, Naoki Takeno, Hirokazu Kajiura, and Mitsuru NagasawaCite this: Macromolecules 1978, 11, 5, 888–893Publication Date (Print):Septembe…
Abstract Three samples have been selected to represent the sedimentary variations of the Basin of Autun. IR and ESR techniques have been used to study the sheet composition of the different kinds of clays. The kaolinites are fire clays with two different degrees of crystallinity. The illites have a muscovite origin an…
The application of magnetic amorphous alloys in power transformers could produce significant savings of energy. Currently, the major disadvantage of amorphous alloys is their relatively low room-temperature saturation induction. We have attained a saturation reduction of 17.3 kG in heat-treated amorphous Fe86B8C6. By…
The response of a lead zirconate titanate ceramic to statically applied uniaxial stresses in the range 0–0.4 GPa has been investigated. The material studied was a niobium-doped composition with the chemical formula Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3. Properties measured as a function of stress include electrical charge…
Abstract A quantitative procedure has been developed for characterizing the complete microstructure of polymers of 1,3‐pentadiene, including the tacticity of any crystalline component. This can be accomplished by a combination of infrared spectroscopy, X‐ray crystallinity, and 300‐MHz NMR spectroscopy. A series of hig…
Summary Whiteite, Ca(Fe,Mn) 2+ Mg 2 Al 2 (OH) 2 (H 2 O) 8 [PO 4 ] 4 , a 14·90(4) Å, b 6·98(2) Å, c 10·13(2) Å, β 113° 07(10)′, Z = 2, space group P 2/ a , α 1·580(5), β 1·585(5), γ 1·590(5), 2V 40–50°, specific gravity 2·58, is a new species from the Ilha de Taquaral, Minas Gerais, Brazil. It is the Al 3+ -analogue of…
Abstract Small‐angle x‐ray scattering (SAXS) and wide‐angle x‐ray scattering (WAXS) as well as small‐angle light‐scattering (SALS) techniques have been applied to investigate the microstructure of a number of commercial poly(vinyl chloride) (PVC) samples. From the wide‐angle x‐ray scattering, crystallinity and crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelative Reactivities in Oxidations of Polypropylene and Polypropylene ModelsFrank R. MayoCite this: Macromolecules 1978, 11, 5, 942–946Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 September 1978https://pubs.acs.…
The defect populations in various MnAl permanent magnet materials have been studied by transmission electron microscopy. It is suggested by the observations that the good hard magnetic properties in the extruded materials are connected with the low density of antiphase boundaries and the relatively high density of def…
The value of the Weibull, logarithmic-logistic, and logarithmic-normal plots in expressing dissolution rate data is considered for the combinations of zero and first-order release with sink and non-sink conditions, and for actual dissolution rate data of diazepam from tablets in a medium of pH2.
Abstract Regression analyses were used to correlate organic matter, texture and surface area values to the cation‐exchange capacity (CEC) of clay‐rich soils in the lowlands of Quebec. The Ap, Bg and Cg horizons of 11 Gleysolic soils (Aqu‐Suborders) were analyzed for CEC, exchangeable bases and acidity, total and fine…
A mathematical model is developed to describe the processes by which transient appearance of salt films occurs during initial stages of corrosion of oxide‐free metal surfaces. The model describes transport‐controlled processes which lead to supersaturation by anodic dissolution, to precipitation of a salt film, and ev…
A generalized form of mean field theory and procedures for applying it to analyze experimental data on the temperature dependence of the saturation magnetization or the effective gyromagnetic factor of n-component amorphous transition-metal–rare-earth alloys are outlined. This analysis yields the spin values of each c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer-effect study of the thermally induced spin transition in tris(2-picolylamine)iron(II) chloride. Dilution effect in mixed crystals of [FexZn1-x(2-pic)3]Cl2.C2H5OH (x = 0.15, 0.029, 0.0009)P. Guetlich, R. Link, and H. G. SteinhaeuserCite this: Inorg. Chem. 1978, 17,…