Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Si-Si bonds from Si-H bonds in the presence of hydrosilation catalystsKatherine A. Brown-WensleyCite this: Organometallics 1987, 6, 7, 1590–1591Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMononuclear manganese(IV) complexes of hydroxyl-rich Schiff base ligandsDimitris P. Kessissoglou, Xinhua Li, William M. Butler, and Vincent L. PecoraroCite this: Inorg. Chem. 1987, 26, 15, 2487–2492Publication Date (Print):July 1, 1987Publication History Published online1 Ma…
Abstract The synthesis and characterization of liquid crystalline side chain polymers with mesogenic groups laterally attached to the polymer main chain are described. By variation of the terminal group, mesogenic moiety or spacer length, a change in the glass transition temperature, the nematic to isotropic transform…
A new method for preparing the polymer films directly in the reduced atmosphere has been developed. In this process the polymerization can be carried out through depositing the component monomer vapors. Both pyromellitic dianhydride and 4,4′-diaminodiphenyl ether (oxydianiline) were evaporated at a molar ratio in term…
Nitric oxide adsorption, decomposition, and desorption were studied on Rh(100) in the temperature range from 88 to 1100 K using electron energy loss spectroscopy (EELS) and temperature programmed desorption (TPD). The EEL spectrometer was equipped with a multichannel detector for fast data acquisition. There are two a…
The structure of the elpasolite Cs2KCr(CN)6 has been determined at 7.0 K by neutron diffraction. 877 unique reflections refined to Rw = 0.020, ? = 1.4. The Cr(CN)6 unit is close to regular octahedral coordination geometry, with bond lengths of 207.4(4) for Cr-C and 116.6(6) pm for C-N. The C-Cr-C angles average to 90.…
Abstract The tetracyanoethylene anion radical ( \documentclass{article}\pagestyle{empty}\begin{document}${\rm TCNE}^{ \cdot ^ - } $\end{document} ) was detected by ESR spectroscopy in polytetrafluoroethylene (PTFE), which had been mechanically fractured in vacuo with tetracyanoethylene (TCNE) at 77 K. The assignment o…
Abstract The dispersion characteristics of five arid land soils were determined upon reaction with solutions having various levels of electrolyte concentration, C ( C = 0, 1, 4, 10, 30, 50, and 100 mmol c L −1 ), and sodium adsorption ratios, SAR (0, 5, 10, 20, and 40) with either Ca or Mg as the divalent counter‐ion.…
The skin-core structure of various injection-molded samples of PP differing by molecular weight and the injection conditions—essentially injection rate and holding pressure—has been studied by microscopy, DSC, WAXS, and IR dichroïsm on microtome sections. The depth distributions of the degree of crystallinity, macromo…
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…