Materials Literature
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Abstract The five independent elastic moduli C 11 , C 12 , C 13 , C 33 , and C 44 of oriented high‐density polyethylene with draw ratio λ from 1 to 27 have been determined from −60 to 100°C by an ultrasonic method at 10 MHz. At low temperature the sharp rise in the axial extensional modulus C 33 with increasing λ and…
Abstract The oxidative polymerization of 2,6‐dimethylphenol ( 1 ) and the halogen displacement polymerization of 4‐halo‐2,6‐dimethylphenols ( 4 ) yielded poly[oxy(2,6‐dimethyl‐1,4‐phenylene)] ( 2 ) with one phenolic end group. 2,2′,6,6′‐Tetramethyl‐4,4′‐isopropylidenediphenol ( 9a ) was used as comonomer in both polym…
Abstract Synthesen der perhalogenierten 1,2,3,5‐Dithiadiazolium‐Salze FCN 2 S 2 + Cl − ( 5 ) (durch Metathese aus ClCN 2 S 2 + Cl − mit AgF 2 ), FCN 2 S 2 + AsF 6 − ( 5a ) (aus 5 und AgAsF 6 ), CF 3 CN 2 S 2 + Cl − ( 11 ) (aus CF 3 CN und S 3 N 3 Cl 3 in fl. SO 2 (bei dieser Reaktion werden als Nebenprodukte u.a. S 5…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear Broensted-type plot in the pyridinolysis of 2,4-dinitrophenyl benzoate in aqueous ethanolEnrique A. Castro and Carlos L. SantanderCite this: J. Org. Chem. 1985, 50, 19, 3595–3600Publication Date (Print):September 1, 1985Publication History Published online1 May 200…
Various sintered Nd15Fe77B8permanent magnets supplied by different producers have been examined by analytical electron microscopy. An identical microstructure was found in all of the different magnets. Three phases were detected by means of high resolution electron microscopy, electron diffraction and x-ray microanaly…
Abstract The viscoelastic properties of solid samples (crystals, amorphous films) of hen egg white lysozyme, bovine serum albumin, and sperm whale myoglobin were studied in the temperature range of 100–300 K at different hydration levels. Decreasing the temperature was shown to cause a steplike increase in the Young's…
Neutron inelastic scattering has been used to measure for the first time the ground- to excited-state crystal-field transitions in ${\mathrm{PrO}}_{2}$ (130 meV), ${\mathrm{BaPrO}}_{3}$ (255 meV), and ${\mathrm{UO}}_{2}$ (\ensuremath{\sim}160 meV). Details of these neutron experiments using the epithermal neutrons fro…
The arsenic composition dependences of electron and hole ionization coefficients, α and β, in
This paper describes current understanding of the propagation of transgranular stress corrosion cracking (TGSCC) in engineering alloys. In contrast to intergranular stress corrosion cracking (IGSCC), which proceeds by preferential anodic dissolution at the crack tip, TGSCC is considered to propagate by discontinuous b…
Mossbauer and DC susceptibility studies are reported on the mixed spinel Mg 1+t Fe 2-2t Ti t O 4 at various temperatures and in an external magnetic field. Results are obtained indicating that on increasing dilution t, the collinear ferrimagnetic phase breaks down before reaching the ferrimagnetic percolation limit as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGround term splitting of high-spin cobalt(2+) ion as a probe of coordination structure. 1. Dependence of the splitting on coordination geometryMarvin W. Makinen, Lawrence C. Kuo, Moon B. Yim, Gregg B. Wells, James M. Fukuyama, and Judy E. KimCite this: J. Am. Chem. Soc. 1985…
When Escherichia coli grows on acetate, the flow of isocitrate through the glyoxylate bypass is regulated, in part, through the phosphorylation of isocitrate dehydrogenase. In addition to its role in adaptation to alternative carbon sources, this phosphorylation system responds to variation in the intracellular level…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic interactions in metal complexes of binucleating ligands. 2. Synthesis and properties of binuclear copper(II) compounds containing exogenous ligands that bridge through two atoms. Crystal and molecular structure of a binuclear .mu.-pyrazolato-N,N'-bridged dicopper(II…
Technological advances are extending the applications for bonded ceramic-metal components and demanding more rigorous performance characteristics. The techniques available for fabricating high–integrity joints for structural applications have been reviewed and attention is drawn to the factors that effect both direct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic superconductors: structural aspects and design of new materialsJack M. Williams, Mark A. Beno, Hau H. Wang, Peter C. W. Leung, Thomas J. Emge, Urs Geiser, and K. Douglas CarlsonCite this: Acc. Chem. Res. 1985, 18, 9, 261–267Publication Date (Print):September 1, 1985P…
Abstract Tetraphenylporphinatoaluminum ethyl undergoes addition reaction toward vinyl ketone via a novel enolate aluminum porphyrin as the intermediate. This reaction is remarkably accelerated upon irradiation with visible light retaining the reaction mode.
The effects of α‐radiolysis on leaching were studied in compositionally identical Pu‐doped waste glass samples which were prepared at different α‐activities (dose rates) by varying the 239 Pu/ 238 Pu isotopic ratio in the Pu dopant. The results of 14‐, 28‐, and 56‐d static leach tests at 40°C, in both deionized water…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew layered ternary chalcogenides: tantalum palladium sulfide (Ta2PdS6), tantalum palladium selenide (Ta2PdSe6), niobium palladium sulfide (Nb2PdS6), niobium palladium selenide (Nb2PdSe6).Douglas A. Keszler, Philip J. Squattrito, Nathaniel E. Brese, James A. Ibers, Maoyu Sha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of aliphatic polyamides. 3. Mechanisms of photooxidation of polyamides 6, 11, and 12 at short wavelengthAgnes Roger, Daniel Sallet, and Jacques LemaireCite this: Macromolecules 1985, 18, 9, 1771–1775Publication Date (Print):September 1, 1985Publication History…
Abstract A trioctahedral, ferrous smectite has been located in the uppermost deposits of Atlantis II Deep, SW basin, Red Sea. This clay is very unstable when removed from its environment of formation and, for example, oxidizes during desiccation under laboratory conditions. Only X-ray transmission diffraction study of…