Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstrate effects on the chemisorbed and physisorbed layers of methacryl silane-modified particulate mineralsHatsuo Ishida and James D. MillerCite this: Macromolecules 1984, 17, 9, 1659–1666Publication Date (Print):September 1, 1984Publication History Published online1 May 2…
Abstract not Available.
Abstract Fibers of poly( L ‐lactide) (PLLA) with a loosened fibrillar structure were produced by solution spinning from a good solvent (chloroform) in the presence of various additives (camphor, polyurethanes). No decrease in mechanical properties was observed as compared with PLLA fibers spun from a good solvent only…
Abstract The effect of the polymerization method (one‐or two‐stage) on the morphology and properties of specific polyether‐ and polyester‐based urethanes was studied. For the systems investigated, the polymerization technique was somewhat more influential on properties when the soft segment was a polyester than when i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of ruthenium(II) and ruthenium(III) porphyrins. Crystal structures of .mu.-oxo-bis[(p-methylphenoxo)(meso-tetraphenylporphyrinato)ruthenium(IV)] and ethoxo(meso-tetraphenylporphyrinato)(ethanol)ruthenium(III)-bisethanolJ. P. Collman, C. E. Barnes, P. J. Brothers, T…
Intramuscular injection of [6-D-tryptophan]-luteinizing hormone-releasing hormone [( D-Trp6]LH-RH) in microcapsules of poly(DL-lactide-co-glycolide), designed to release a controlled dose of the peptide over a 30-day period, decreased the weights of androgen-dependent Dunning prostate tumors in rats and suppressed ser…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of acetylene and olefin insertion into palladium-carbon .sigma. bondsEdward G. Samsel and Jack R. NortonCite this: J. Am. Chem. Soc. 1984, 106, 19, 5505–5512Publication Date (Print):September 1, 1984Publication History Published online1 May 2002Published inissue 1…
Abstract Results of a preliminary study of the surface of wood exposed to outdoor weathering as well as to UV irradiation showed that ESCA provides valuable information and insight into the manifestation of weathering and photooxidation. From the ESCA spectra, the increase in signal intensities of carbon–oxygen bonds…
Subsolidus phase relations in the low‐Y 2 O 3 portion of the system ZrO 2‐ Y 2 O 3 were studied using DTA with fired samples and X‐ray phase identification and lattice parameter techniques with quenched samples. Approximately 1.5% Y 2 O 3 is soluble in monoclinic ZrO 2 , a two‐phase monoclinic solid solution plus cubi…
Abstract The yields of C 5 and C 6 alkyl nitrates from neopentane, 2‐methylbutane, 2‐methylpentane, 3‐methylpentane, and cyclohexane have been measured in irradiated CH 3 ONONO‐alkane‐air mixtures at 298 ± 2 K and 735‐torr total pressure. Additionally, OH radical rate constants for neopentyl nitrate, 3‐nitro‐2‐methylb…
Abstract Dypingite, Mg 5 (CO 3 ) 4 (OH) 2 ·5H 2 O, was found in materials obtained during the production of high purity magnesia from crude magnesite by the calcination/CO 2 -leaching process. The snow-white, finely crystalline dypingite contained 41.0% MgO; the theoretical value is 41.5%. The X-ray powder data reveal…
Polyfuran films are prepared electrochemically and found to exhibit electrical and optical properties similar to those of polythiophene and polypyrrole, though the electrical conductivity in a doped state is little lower than the latter two polymers. The resistivity of polyfuran is found to be very sensitive to humidi…
Abstract The general approach to the problem of the real structure of smectites requires an analysis based on the relationship between structural characteristics and diffraction patterns. This paper, which considers only the models corresponding to dioctahedral smectites saturated by K-cations and collapsed, includes:…
The novel ester (E)-phytol (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate++ + (1); (6Z,9Z,12Z,15Z)-hexadecatetraenoic acid; (6Z,9Z,12Z,15Z)-octadecatetraenoic acid; and (6Z,9Z,12Z)-hexadecatrienoic acid isolated from the diatom Navicula delognei f. elliptica, show significant antibacterial activity against Staphylococcus aureu…
A dual‐porosity, agglomerate‐type model for the porous anode and cathode of the molten carbonate fuel cell is developed and used to predict electrode performance in a small, differential‐conversion, cell. The model is based on a phenomenological treatment of mass transport, electrode kinetics, and ionic conduction, co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNature of iron(I) and iron(0) tetraphenylporphyrin complexes. Synthesis and molecular structure of (dibenzo-18-crown-6)bis(tetrahydrofuran)sodium (meso-tetraphenylporphinato)ferrate and bis[tris(tetrahydrofuran)sodium] (meso-tetraphenylporphinato)ferrateToshio Mashiko, Chris…
Abstract Fifty-three samples from the Oxford, Kimmeridge and Speeton Clays of the Yorkshire area have been analysed petrographically and geochemically, by X-ray diffraction, X-ray fluorescence, atomic absorption and combustion (TOC). Major elements and the following trace elements have been determined: Rb, Sr, Ba, Cr,…
The crystallization mechanism in a modified Li 2 O‐Al 2 O 3 ‐SiO 2 glass containing P 2 O 5 nucleating agent was investigated by transmission electron microscopy, X‐ray diffraction, and differential thermal analysis. During an initial 1000°C treatment P 2 0 5 and Li 2 O react to precipitate Li 3 PO 4 crystallites. At…
Alumina powders containing controlled amounts of hard aggregates exhibit isothermal shrinkage rates which decrease markedly with increasing aggregate content. Sintered densities achieved after 1‐ and 24‐h anneals decreased linearly with aggregate content. The microstructures of regions near aggregates and within aggre…
Enthalpies of solution of framework aluminosilicate glasses x M l/ n n + AlO 2 ‐(1‐ x )SiO 2 (M = Cs, Rb, K, Na, Li, Ba, Pb, Sr, Ca, Mg) in molten 2PbO.B 2 O 3 near 973 K were measured. The sequence above represents increasing ability of the nonframework cation M to bond to the bridging oxygen. In that sequence, the e…