Materials Literature
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The electrochemical characteristics of electrodes composed of composites of conducting polymers and alkali‐metal alloys have been investigated. We have found that the addition of poly(p‐phenylene) (PPP) to alkali‐metal alloys greatly enhances the cyclability and the rate capability of alkali‐metal alloys. The impedanc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel photoinduced carbon-carbon bond formation via metal-alkyl and -enolate porphyrins-visible light-mediated polymerization of alkyl methacrylate catalyzed by aluminum porphyrinMasakatsu Kuroki, Takuzo Aida, and Shohei InoueCite this: J. Am. Chem. Soc. 1987, 109, 15, 4737–…
A locus responsible for the Nd-s mutation of the silkworm, Bombyx mori, has been mapped very close to or within the fibroin light (L) chain gene on the 14th chromosome (Takei, F., K. Kimura, S. Mizuno, T. Yamamoto, and K. Shimura, 1984, Jpn. J. Genet., 59:307-313). A strain of B. mori carrying the homozygous Nd-sD mut…
The crystallization behavior of polyethylene terephthalate (PET) was investigated as a function of molecular weight, temperature of crystallization, and polycondensation catalyst system. A detailed analysis of the crystallization course has been made utilizing the Avrami expression. The crystallization rate constants…
Abstract Many alluvial Argids in central Nevada are cemented by illuvial silica and CaCO 3 . In loamy soils, microsite deposition of these authigenic components tends to be mutually exclusive, with silica being finely distributed throughout the plasma phase and calcite plugging packing voids formed by skeleton grains…
Areas under the linear tan δ–temperature (tA) and linear loss modulus–temperature (LA) curves of the polyacrylate and polymethacrylate homologous series and their interpenetrating polymer networks (IPNs) were investigated. For poly(methyl acrylate), LA values are independent of crosslinking level through 25%, but tA d…
Abstract Supercritical carbon dioxide readily induces crystallization in bisphenol A polycarbonate. Crystallization begins within one h of exposure to the CO 2 at temperatures and pressures as low as 75°C and 100 atm. The degree of crystallinity increases sharply as the CO 2 pressure is raised from 100 to 300 atm but…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(N-methylpyrrolylium) poly(styrenesulfonate) - a conductive, electrically switchable cation exchanger that cathodically binds and anodically releases dopamineLarry L. Miller and X. Q. ZhouCite this: Macromolecules 1987, 20, 7, 1594–1597Publication Date (Print):July 1, 19…
The resistance of AlN powder to oxidation upon heat treatment in air is investigated using thermogravimetric analysis (TGA) and x-ray photoelectron spectroscopy (XPS). The results reveal that oxidation is initiated at temperatures above 700 °C. For temperatures between 750 and 900 °C, an intermediate oxidation state,…
Single crystals of various α‐phase Cu‐Zn and Cu‐Al alloys have been tested for dealloying and stress‐corrosion cracking (SCC) in cuprous ammonia solutions. All tests were done at the equilibrium potential of a copper electrode. The dealloying tests were done by scratching coated specimens and measuring the consequent…
The principal axial coefficients of thermal expansion for the (3C), (4H), and (6H) polytypes of SiC are considered to identify the structural role of the stacking layer sequence as it affects the thermal expansion. A general equation based on the fractions of cubic and hexagonal layer stacking is developed that expres…
We have found a linear relation between the transition temperature T sub c (in K) and the hydrogen-bond length R (in A\r{}) for tetragonal ${\mathrm{KH}}_{2}$${\mathrm{PO}}_{4}$-type crystals, ${T}_{c}$=2290(R-2.428), irrespective of whether the crystals are deuterated or undeuterated; this finding supplies negative e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the charge-transfer reaction between decamethylferrocene and 7,7,8,8,-tetracyano-p-quinodimethane (1:1). The iron-57 Moessbauer spectra and structures of the paramagnetic dimeric and the metamagnetic one-dimensional salts and the molecular and electronic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiomimetic aerobic 1,4-oxidation of 1,3-dienes catalyzed by cobalt tetraphenylporphyrin-hydroquinone-palladium(II). An example of triple catalysisJ. E. Baeckvall, A. K. Awasthi, and Z. D. RenkoCite this: J. Am. Chem. Soc. 1987, 109, 15, 4750–4752Publication Date (Print):July…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure effects on dielectric relaxation of supercooled ortho-terphenylMotosuke. Naoki, Hideki. Endou, and Katsuhiro. MatsumotoCite this: J. Phys. Chem. 1987, 91, 15, 4169–4174Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published iniss…
Abstract Complexes between diphenylcarbamido‐dicarboxybenzene and 1‐methyl‐2‐pyrrolidinone, 1/4 and 1/2 M, are obtained by reacting pyromellitic dianhydride with aniline in the solvent 1‐methyl‐2‐pyrrolidinone. Decomplexation and imidization of this diamic acid are studied by thermogravimetric analysis, differential s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT21-Thiatetra-p-tolylporphyrin and its copper(II) bicarbonate complex. Structural effects of copper-thiophene bindingLechoslaw Latos-Grazynski, Jerzy Lisowski, Marilyn M. Olmstead, and Alan L. BalchCite this: J. Am. Chem. Soc. 1987, 109, 14, 4428–4429Publication Date (Print):…
SUMMARY Images in the scanning electron microscope (SEM) are formed from both low‐energy secondary, and high‐energy backscattered, electrons. The quantitative interpretation of SEM images therefore requires a model which can predict the magnitude of both of these signal components for a specimen whose geometry and che…
The upconversion of infrared radiation into green and red fluorescence has been studied for Er3+ and Yb3+ ions in BaF2/ThF4 fluoride glass over a wide temperature range and several dopant concentrations. At room temperature an upconversion efficiency of 3.3×10−5 has been obtained for the green emission from the glass…
Four new organic hosts are described that contain a phthalocyanine core to which four crown ether rings are attached.These hosts include a free base phthalocyanine with 18-crown-6 rings and three copper phthalocyanines with 15-crown-5, 18-crown-6, and 21-crown-7 rings.The macrocycles are synthesized from benzo crown e…