Materials Literature
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A series of polyurethane elastomers based on an aliphatic diisocyanate and a polyether macroglycol was polymerized with various cross-link densities and OH/NCO ratios. Stoichiometries yielding between 8,600 and 12,900 gm/mole/crosslink and an OH/NCO ratio of 1.1 resulted in polymers with the low modulus, yet high stre…
Coefficients of linear thermal expansion are reported in the range from room temperature to 250 degrees C for six optical materials: Polytran potassium chloride and Polytran calcium fluoride-Harshaw; chemical-vapordeposited (CVD) zinc selenide and zinc sulfide-Raytheon; single-crystal germanium-Eagle-Picher; and lithi…
The general class of phase equivalent nonlocal potentials is examined using standard reaction matrix methods. The relationship between phase equivalent overlap matrices is derived and it is found that the matrices fall into four general classes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of .mu.-oxo-bridged iron(III) complexes with organic acids: a characterization of the productsRonald G. Wollmann and David N. HendricksonCite this: Inorg. Chem. 1978, 17, 4, 926–930Publication Date (Print):April 1, 1978Publication History Published online1 May 2002P…
Abstract Small‐angle x‐ray scattering (SAXS) has been used to study the formation of microvoids in polymers which craze or stress‐whiten extensively. Specimens are subjected to a stepwise uniaxial strain, with scattering curves being obtained at each step. The increase in scattering intensity upon crazing is attribute…
A stable histone core complex containing equimolar ratios of H2A, H2B, H3, and H4 has been isolated from chicken erythrocyte chromatin in high salt. This complex has been characterized by sedimentation and chemical cross-linking studies. In velocity ultracentrifugation, only one single sharp sedimentation boundary has…
Abstract X-ray superlattice reflections, infrared spectroscopy, and chemical analyses have established that cetylpyridinium bromide (CPB) is highly ordered when adsorbed on vermiculite. The molecules, which stand at about 57° to the silicate surface, form close-packed arrays. Full surface coverage is achieved only for…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTA comparative study of the pyrolyses of the tetramethyl derivatives of silicon, germanium, and tin using a wall-less reactorJay E. Taylor and Thomas S. MilazzoCite this: J. Phys. Chem. 1978, 82, 8, 847–852Publication Date (Print):April 1, 1978Publication History Published online…
Results of Seebeck and resistivity measurements on carefully grown pure single crystals of NiO are shown to be inconsistent with predictions based on itinerant carrier models. A new model for hopping conduction, which contains a dependence of the hopping activation energy on spin ordering, is proposed and used to pred…
The first peralkylated complexes of metals in the lanthanoid series have now been synthesized. The compounds are extremely sensitive to air and moisture but decompose only slowly at their melting points of 138–139°C (M Er) and 141–142°C (M Lu). equation image
Abstract The polarized absorption spectra over the range, 5000–37000 cm−1, were observed on the single crystals of the highly-conductive, mixed-valence tetrathiafulvalenium salts, (TTF)Br0.71, (TTF)I0.71, and (TTF)(SCN)0.57, by using a microspectrophotometer. The spectra of these crystals were very similar to each oth…
The electron microprobe can be successfully used in the analysis of hydrated glass (perlite), and its ability to analyze very small volumes makes it an ideal tool for studying processes of hydration and ion exchange. Water content, although not measured directly, may be estimated quite accurately by difference-of-sum…
A model is presented for corrosion of carbon steel in 60–96% weight sulfuric acid with correlations and data to facilitate quantitative use of the model for mechanical and process design. Corrosion is limited by the rate of convective mass transfer of ferrous ion from a ferrous sulfate (corrosion product) film‐liquid…
The intrinsic properties of a yarn are brought about by its physical structure. This structure in its turn is controlled by the process conditions applied. A quantitative description is given of the effect of temperature, time, and tension during annealing on the structure of poly(ethylene terephthalate) yarns. Anneal…
Hydrothermal experiments were conducted to explore the effects of changing chemistry, temperature, and pressure on the reaction of smectite, run I : I with pure water, to mixed-layer clay. At high temperatures trioctahedral smectites are more stable than dioctahedral smectites' For dioctahedral smectites, hydrothermal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentagonal-bipyramidal complexes. Crystal and molecular structures of chloroaqua(2,6-diacetylpyridine bis(semicarbazone))manganese(II), -iron(II), -cobalt(II), and -zinc(II) chloride dihydratesGus J. Palenik and Dennis W. WesterCite this: Inorg. Chem. 1978, 17, 4, 864–870Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution-state spin-equilibrium properties of the tris[2-(2-pyridyl)imidazole]iron(II) and tris[2-(2-pyridyl)benzimidazole]iron(II) cationsKaren A. Reeder, Eric V. Dose, and Lon J. WilsonCite this: Inorg. Chem. 1978, 17, 4, 1071–1075Publication Date (Print):April 1, 1978Publ…
S Roy Morrison New York: Plenum 1977 pp xvii + 415 price $47.40 This is a good book for chemists and metallurgists researching and studying in the fields of surface reactivity, corrosion or surface catalysis. It provides a helpful review and bibliography in these fields.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA systematic x-ray absorption study of molybdenum complexes. The accuracy of structural information from extended x-ray absorption fine structureStephen P. Cramer, Keith O. Hodgson, Edward I. Stiefel, and William E. NewtonCite this: J. Am. Chem. Soc. 1978, 100, 9, 2748–2761P…
A general theory of vibronically induced electric-dipole intensity in the f-f transitions of octahedral (Oh ) six-coordinate trivalent lanthanide ion complexes is developed. The theory is based on a model in which both static (point-charge crystal field) and dynamic (transient ligand dipoles) coupling between the meta…