Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of different organic side groups on the thermal behavior of polyphosphazenes: random chain cleavage, depolymerization, and pyrolytic cross-linkingHarry R. Allcock, Gayann S. McDonnell, Geoffrey H. Riding, and Ian MannersCite this: Chem. Mater. 1990, 2, 4, 425–432Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polyethers based on conformational isomerism. 10. Synthesis and determination of the virtual mesophases of polyethers based on 1-(4-hydroxyphenyl)-2-(2-methyl-4-hydroxyphenyl)ethane and .alpha.,.omega.-dibromoalkanes containing from 17 to 20 methylene unit…
A novel compound formed by copper(I1) and a nitronyl nitroxide stable radical of formula Cu(hfac),NITiPr (hfac = hexafluoroacetylacetonate; NITiPr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihydroI-H -imidazolyl-1 -oxy1 3-oxide) has been synthesized. It crystallizes in the monoclinic system, space group P2,/c with u = 13.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective hydroxylation of methyl groups by platinum salts in aqueous medium. Direct conversion of ethanol to ethylene glycolJay A. Labinger, Andrew M. Herring, and John E. BercawCite this: J. Am. Chem. Soc. 1990, 112, 14, 5628–5629Publication Date (Print):July 1, 1990Public…
Abstract 2‐Allyloxymethyl‐2‐ethyltrimethylene carbonate ( 1 ) was polymerized in toluene with sec ‐butyllithium as initiator. The resulting product exhibits a bimodal molecular weight distribution. The low‐molecular‐weight fraction consists mainly of cyclic oligomers and to a minor portion of acyclic oligomers. With 2…
Carbon films containing nitrogen and/or boron were prepared in a closed system by the pyrolysis of appropriate precursor materials. The decomposition products of the pyrolysis were identified and the resulting films were characterized by chemical and physical means. The electrical conductivity of the heteroatom‐contai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption equilibrium of toluene from supercritical carbon dioxide on activated carbonChung Sung Tan and Din Chung LiouCite this: Ind. Eng. Chem. Res. 1990, 29, 7, 1412–1415Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue…
The design of a fusion reactor blanket based on a bed of lithium-containing ceramic pebbles or a mixture of ceramic and metallic pebbles requires knowledge of the effective thermal conductivity of such beds. Binary mixtures of spheres with the same diameter but different conductivities as well as beds formed by one ty…
The effects of a substitution for Cu by other 3d metals (Ni, Co, and Zn) on ${\mathit{T}}_{\mathit{c}}$ in the Nd-Ce-Cu-O system was studied and compared with effects of the same ions on ${\mathit{T}}_{\mathit{c}}$ in the La-Sr-Cu-O system. We found (1) Zn suppresses ${\mathit{T}}_{\mathit{c}}$ more slowly in the Nd t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox reactivity of iron(III) porphyrins and heme proteins with nitric oxide. Nitrosyl transfer to carbon, oxygen, nitrogen and sulfurRuth S. Wade and C. E. CastroCite this: Chem. Res. Toxicol. 1990, 3, 4, 289–291Publication Date (Print):July 1, 1990Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganosilicon polymers: synthesis of poly[(silanylene)diethynylene]s with conducting propertiesRobert J. P. Corriu, Christian Guerin, Bernard Henner, Alain Jean, Francis Garnier, Abderahim Yassar, and Thomas KuhlmannCite this: Chem. Mater. 1990, 2, 4, 351–352Publication Date…
Mackinawite, a tetragonal iron sulfide mineral, is generally a major corrosion product when iron alloys are corroded by sulfate-reducing bacteria (SRB). The experimental database for the mineral indicates that on nongeologic time scales, mackinawite, if it forms at all in nonbiological corrosion, does so only under ve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkane functionalization by nonporphyrin iron complexes: mechanistic insightsRandolph A. Leising, Richard E. Norman, and Lawrence Que Jr.Cite this: Inorg. Chem. 1990, 29, 14, 2553–2555Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Publishe…
Three different cellulosic fibers-a mechanical pulp, wood flour, and cellulose pulp-were used as filler in high-density polyethylene (HDPE). the addition of wood fiber in HDPE increased the stiffness of the composites while the tensile strength decreased. to improve the adhesion between the filler and the polymer matr…
It is shown that for arbitrary n, there exists a trace map for any n-letter substitutional sequence. Trace maps are explicitly obtained for the well-known circle and Rudin-Shapiro sequences which can be defined by means of substitution rules on three and four letters, respectively. The properties of the two trace maps…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible interconversion between a nitrido complex of osmium(VI) and an ammine complex of osmium(II)David W. Pipes, Mohammed Bakir, S. E. Vitols, Derek J. Hodgson, and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1990, 112, 14, 5507–5514Publication Date (Print):July 1, 1990…
We present a simple model for the temperature and thickness dependence of the direction of magnetization of ferromagnetic thin films or sandwiches. Above a temperature that is much smaller than the Curie temperature, the magnetization in the presence of a uniaxial anisotropy is aligned completely parallel to the surfa…
The supply of docosahexaenoic acid (22:6) to the frog retina, and its subsequent use by retinal cells, was studied by autoradiography and biochemical methods. Different delivery routes of 3H-22:6 were evaluated. Predominant uptake by the neural retina, mainly in ganglion cell axons, outer synaptic layer, and Müller ce…
Tire de : 1st international workshop on modern developments and applications in microbeam analysis, University of Anvers (Belgium), March 8-10, 1990. Publie dans 'Scanning', vol.12, 1990, p.212-224
Abstract This study was conducted to determine if a single unbuffered salt extractant for exchangeable bases and Al could be used in place of a buffered salt extractant for exchangeable bases and an unbuffered salt extractant for exchangeable Al. Barium chloride and a mixed NH 4 Cl‐BaCl 2 extractant were compared with…