Some very rapid reactions of porphyrins in aqueous solution
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Use of Cryptates in Anionic Polymerization of Lactones
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Cryptates in Anionic Polymerization of LactonesA. Deffieux and S. BoileauCite this: Macromolecules 1976, 9, 2, 369–371Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/ma6…
The Morphology of Directionally Solidified Poly(ethylene oxide) Spherulites
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Morphology of Directionally Solidified Poly(ethylene oxide) SpherulitesAndrew J. Lovinger and Carl C. GryteCite this: Macromolecules 1976, 9, 2, 247–253Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https…
Ferric tris(dithiocarbamate) spin equilibrium revisited. Variable-temperature (4.2-296.deg.K) magnetic susceptibility, (30-300.deg.K) infrared, and (4.2-85.deg.K) electron paramagnetic resonance data
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerric tris(dithiocarbamate) spin equilibrium revisited. Variable-temperature (4.2-296.deg.K) magnetic susceptibility, (30-300.deg.K) infrared, and (4.2-85.deg.K) electron paramagnetic resonance dataGretchen R. Hall and David N. HendricksonCite this: Inorg. Chem. 1976, 15, 3…
Thermally stimulated and isothermal depolarization currents in low‐density polyethylene
Abstract Thermally stimulated and isothermal depolarization currents of three low‐density polyethylenes are investigated in the temperature range 80–320°K. The thermally stimulated current spectra can be analyzed in terms of a continuous relaxation time spectrum. This spectrum can be resolved into three Gaussian distr…
Crystal structure of poly(m‐phenylene isophthalamide)
Abstract The crystal structure of poly( m ‐phenyulene isophthalamide) was determined by x‐ray analysis. The triclinic cell, with a = 5.27 Å, b = 5.25 Å, c (fiber axis) = 11.3 Å, α = 111.5°, β = 111.4° and γ = 88.0° and space group P 1, contains one monomeric unit. The crystal density is 1.47 g/cc. The molecules in the…
Particle size and strain broadening in energy-dispersive x-ray powder patterns
An energy-dispersive x-ray method for a rapid analysis of the broadening of diffraction lines in powder patterns has been developed. Experimental results are given for magnetite powders with sizes in the range 50–200 Å and compared with the results of standard angle-dispersive diffractometry and electron microscopy. T…
Mixed‐Mode Fracture from Controlled Surface Flaws in Hot‐Pressed Si 3 N 4
The room‐temperature mixed‐mode fracture of commercial hot‐pressed Si 3 N 4 was examined using controlled surface flaws in 4‐point bending, oriented at various angles 6 with respect to the outer fiber tensile stress direction. Catastrophic fracture paths were non‐coplanar with the initial flaw plane, and the stress in…
The Second Electroviscous Effect in Polymer Latices
Free electrolyte was removed by ion exchange from monodisperse polystyrene latex. Non-Newtonian viscosities were measured at volume fractions from 0.05 to 0.50, at various electrolyte concentrations. Electrolytes included HCl, K2SO4, MgSO4, Al2(SO)4)3, and Th(NO3)4. Deionized latices exhibited yield stresses τ0 which…
Defect centers in a pure-silica-core borosilicate-clad optical fiber: ESR studies
An electron-spin-resonance (ESR) study has been carried out on γ-ray-induced color centers in a pure-SiO2-core B2O3⋅3SiO2-clad prototype optical fiber and in bulk glasses of the core and cladding compositions. Defects in the core material included the familiar silicon E′ center and other centers tentatively attributed…
Heat Capacity and Structural Relaxation of Mixed‐Alkali Glasses
Heat capacities of a series of mixed‐alkali glasses of composition (in mol%) 24.4(Na 2 O + K 2 O)‐75.6SiO 2 were measured in the transition region by differential scanning calorimetry. The glass heat capacities at 700 K and the equilibrium liquid heat capacities are the same for all glasses on a per‐g atom basis and e…
Metal-metal interactions involving metalloporphyrins. III. Conversion of tetraphenylporphinatoiron(III) azide to an N-bridged hemin dimer
<P>Abstract copyright UK Data Service and data collection copyright owner.</P>The Scottish Young People Survey (SYPS), a cohort series, began in 1984, subsuming the Scottish Qualified School Leavers Surveys, (GN 33237). It is a postal survey in which questionnaires are initially sent to young people approximately nine…
Capture cross section and trap concentration of holes in silicon dioxide
Hole trapping in thermally grown silicon-dioxide films has been studied using optically induced hot-hole injection in p-channel polysilicon-SiO2-silicon field-effect-transistor structures. Analysis of the data assuming a uniform trap distribution and no detrapping gives 3.1×10−13 cm2 and 1.4×1018 cm−3 for the capture…
Nitrosylmetalloporphyrins. III. Synthesis and molecular stereochemistry of nitrosyl-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinato(1-methylimidazole)iron(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrosylmetalloporphyrins. III. Synthesis and molecular stereochemistry of nitrosyl-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinato(1-methylimidazole)iron(II)W. Robert Scheidt and Paul L. PiciuloCite this: J. Am. Chem. Soc. 1976, 98, 7, 1913–1919Publication Date (Print)…
The spectrum of Nd3+:LaCl3
New measurements of the optical spectrum of trivalent neodymium in a hexagonal lanthanum chloride host have been made at 4 and 77 K at wavelengths down to 2500 Å (40 000 cm−1). Crystal quantum number assignments for new energy levels were derived from these results and for most of the earlier levels not already classi…
A protecting layer for the dielectric in AC plasma panels
One of the important problems in the development of ac plasma panels is to produce panels that maintain stable characteristics for a long time. A new idea for using a protecting layer over the dielectric layer which isolates the electrodes from the gas was examined and good results were obtained. Moreover, besides sta…
Analysis of weak-boundary-coupling effects in liquid-crystal displays
The analysis of Rapini and Papoular for homeotropic and homogeneous geometries is extended to predict the effects of weak boundary coupling on liquid-crystal display performance. An implicit expression for deformation as a function of applied field is derived for the case of equal elastic constants. Steeper transition…
Chemistry of the Cure of Poly(p-phenylene sulfide)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of the Cure of Poly(p-phenylene sulfide)Richard T. HawkinsCite this: Macromolecules 1976, 9, 2, 189–194Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/ma60050a001http…
Polyurethane Interpenetrating Polymer Networks. I. Synthesis and Morphology of Polyurethane-Poly(methyl methacrylate) Interpenetrating Polymer Networks
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane Interpenetrating Polymer Networks. I. Synthesis and Morphology of Polyurethane-Poly(methyl methacrylate) Interpenetrating Polymer NetworksS. C. Kim, D. Klempner, K. S. Frisch, W. Radigan, and H. L. FrischCite this: Macromolecules 1976, 9, 2, 258–263Publication D…
Green Algae. Structure, Reproduction and Evolution in Selected Genera
No abstract available.