Materials Literature
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Abstract A useful concept in polymer science is the degree of crystallinity—the fraction of the polymer that exists in a relatively ordered state. Methods of determination of the degree of crystallinity using density, infrared, thermal, N.M.R. and X ‐ray measurements are examined in light of modern notions of the stru…
The formula proposed recently by Vuks for the polarization field associated with strongly anisotropic organic molecules has been applied to evaluate the orientational order in p-azoxyanisole, p-azoxyphenetole and their mixtures in the nematic phase. It is found to yield accurate results as is confirmed by the internal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of palladium by azo and related functional groupsAlan L. Balch and D. PetridisCite this: Inorg. Chem. 1969, 8, 11, 2247–2252Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.o…
Abstract Some properties of multilayered films are summarized in relation to the properties of the component materials. Polymers may be selected for co‐extrusion into layered films to obtain various combinations of properties, such as barrier, stiffness, heat sealability, optics, and toughness. Properly chosen combina…
Abstract β-Hydroxydecanoyl thioester dehydrase from E. coli has been shown to have a molecular weight of 36,000 by ultracentrifugation, gel filtration, and amino acid composition. Electrophoretic behavior, however, suggests that the protein molecule is composed of two equal, if not identical, polypeptide chains of mol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra and bonding in the sodium superoxide and sodium peroxide moleculesLester AndrewsCite this: J. Phys. Chem. 1969, 73, 11, 3922–3928Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of crystal growth of dicalcium phosphate dihydrateRobert W. Marshall and George H. NancollasCite this: J. Phys. Chem. 1969, 73, 11, 3838–3844Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https…
According to Doyle, the thermogravimetric curve of a decomposition reaction can be expressed by the equation log g(α)–log p(x) = B. The variable x depends on the temperature Tα, at which the fraction of the initial compound decomposed is α. Both g(α) and p(x) depend on temperature; however, B is independent of tempera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Kinetic Equation for the Initiated, Anionic Polymerization of η-CaprolactamR. Z. Greenley, J. C. Stauffer, and J. E. KurzCite this: Macromolecules 1969, 2, 6, 561–567Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue…
Circular cylindrical shells with axisymmetric imperfections tested under axial compressive load, studying imperfection amplitude and wavelength effects on minimum buckling load
Abstract The physical optics of iridescent multilayered plastic films are analyzed theoretically relating the layer thickness, layer arrangement, and refractive index difference between layers to the reflection spectra for light at normal incidence. Very vivid iridescent and metallic‐appearing films may be made by pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEscherichia coli citrate synthase. Purification and the effect of potassium on some propertiesGerald R. Faloona and Paul A. SrereCite this: Biochemistry 1969, 8, 11, 4497–4503Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published ini…
Electrochemical studies were made in aqueous LiCl, MgCl2, and MgBr2 solutions and in ZnCl2/KCl molten salt to clarify the corrosion reactions related to stress corrosion cracking (SCC) of austenitic stainless steel and to better define environmental variables critical to the occurrence of chloride SCC. Type 304 stainl…
The mechanical properties of chemically vapor‐deposited β‐Sic were measured in bending between room temperature and 1400°C. Material with grain diameters from less than 1 to 15 μm was tested. No grain‐size dependence of the bend strength of dense (<99% of theoretical) Sic was observed at any test temperature. The f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicelle formation in pure ethylene glycolAshoka RayCite this: J. Am. Chem. Soc. 1969, 91, 23, 6511–6512Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.org/doi/10.1021/ja01051a069https://…
Transmittance and reflectance studies have been made in the 0.83–25 μ range on GeTe films to obtain and compare the optical properties of amorphous and crystalline structures. The refractive index of crystalline GeTe films (typical value 5.5 at 1.5 μ) shows free carrier dispersion yielding optical dielectric constant=…
Summary Bivalves lay down two forms of calcium carbonate in their shells, aragonite and calcite. Shells may be wholly aragonitic, or may contain both aragonite and calcite, in separate monomineralic layers. Shells are built up of several layers of distinct aggregations of calcium carbonate crystals. These aggregations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular electron ionization cross sections at 70 evJ. A. Beran and L. KevanCite this: J. Phys. Chem. 1969, 73, 11, 3866–3876Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.org/doi/10.1…
The Néel theory of magnetization relaxation has been systematically and quantitatively tested for six samples containing synthetic and natural single domain grains. The results of a wide range of experiments involving time, temperature, and direct and alternating magnetic fields were compared with theoretical results…
The nucleation of a shear dislocation loop from the interface of a misfitting spherical particle in a deformable matrix is considered. The equilibrium shapes and positions of the nucleated dislocation have been calculated. There are two critical levels of misfit. The lower critical level, which is dependent on the par…