Materials Literature
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The aim of this work was to study the activation mechanism of pure aluminum in the absence and presence of indium ions in a chloride-containing medium using the electrochemical noise technique. A correlation was obtained between the noise response and the type of corrosion morphology observed by scanning electron micr…
The first C10H4 hydrocarbon, the title compound, and a few of its derivatives have been synthesized by simple reactions from bis(trimethylsilyl)-1,4-pentadiyn-3-one. Compound 1 can be isolated in the form of colorless leaflets that are extremely sensitive to polymerization. Because of its cross-conjugated π-electron s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomorphic behavior of random copolymers: thermodynamic analysis of cocrystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Naoko Kamiya, Minoru Sakurai, Yoshio Inoue, and Riichiro ChujoCite this: Macromolecules 1991, 24, 13, 3888–3892Publication Date (Print):June 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric property-electrooptical effect relationships of polymer/liquid-crystal composite filmsAkira Miyamoto, Hirotsugu Kikuchi, Satoshi Kobayashi, Yasuhiro Morimura, and Tisato KajiyamaCite this: Macromolecules 1991, 24, 13, 3915–3920Publication Date (Print):June 1, 1991…
Abstract Free radical reactions, carried out in polymer melts, have become a popular method of chemically modifying polyolefins. The elementary free‐radical reactions which are relevant in the chemical modification of polyolefins at high temperatures in extruders, such as chain transfer to polymer via primary and poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnodic underpotential deposition and cathodic stripping of iodine at polycrystalline and single-crystal gold: studies by LEED, AES, XPS, and electrochemistryBeatriz G. Bravo, Susan L. Michelhaugh, Manuel P. Soriaga, Ignacio Villegas, D. Wayne Suggs, and John L. StickneyCite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariation of polypropylene microtacticity by catalyst selectionScott Collins, William J. Gauthier, David A. Holden, Bradley A. Kuntz, Nicholas J. Taylor, and David G. WardCite this: Organometallics 1991, 10, 6, 2061–2068Publication Date (Print):June 1, 1991Publication Histor…
The average and equilibrium molecular geometries and vibrational characteristics of MnCl2, FeCl2, CoCl2, NiCl2, MnBr2, FeBr2, CoBr2, and NiBr2 have been determined by a combined analysis of gas-phase electron diffraction and vibrational spectroscopic data. The nozzle temperatures ranged between 960 and 1100 K in the e…
Research News: Protein cages acting as constrained reaction environments have recently been used to synthesize inorganic materials of nanometer dimensions. The size of the cavity within the protein and the level of loading with metal ions determine the final dimensions of the materials, and therefore site‐specific mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of new polysiloxane starburst polymersAtsushi Morikawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1991, 24, 12, 3469–3474Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 Jun…
The amino-terminal pro-sequence consisting of 77 amino acid residues is required to guide the folding of secreted subtilisin E, a serine protease, into active, mature enzyme (ikemura et al., 1987). Furthermore, denatured subtilisin E can be folded to active enzyme in an intermolecular process with the aid of an exogen…
Fatigue crack propagation in 3Y‐TZP was investigated using controlled surface flaws. A unique growth law strongly dependent on the maximum stress intensity factor and quadratically dependent on the amplitude of the range of stress intensity factor was established. This growth law was found to apply for both surface fl…
A new molecular photovoltaic system for solar light harvesting and conversion to electricity has been developed. It is based on the spectral sensitization of a thin ceramic membrane by suitable transition metal complexes. The film consists of nanometer-sized colloidal titanium dioxide particles sintered together to al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of bis(isothiocyanato)bis(pyrazine)iron polymer, a 2D sheetlike polymerJose Antonio Real, Giovanni De Munno, M. Carmen Munoz, and Miguel JulveCite this: Inorg. Chem. 1991, 30, 12, 2701–2704Publication Date (Print):June 1, 1991Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer photochemistry in ion-molecule cluster complexes of silverK. F. Willey, P. Y. Cheng, M. B. Bishop, and M. A. DuncanCite this: J. Am. Chem. Soc. 1991, 113, 13, 4721–4728Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Publishe…
The local chain dynamics of bulk amorphous polymers above the glass transition temperature is studied by means of molecular dynamics simulations in the time scale up to 10−9 s. A model of polyethylene having a realistic density is used where a fully vibrational treatment is applied to the chains subject to nonbonded i…
Directional solidification experiments have been carried out using the analogue casting system of NH 4 Cl-H 2 O solution by cooling it from below with a constant-temperature surface ranging from - 31.5°C to + 11.9 °C. The NH 4 Cl concentration was 26% in all solutions, with a liquidus temperature of 15 °C. It was foun…
Few superconducting materials have presented us with the structural elegance and complexity displayed by the recently discovered high-Tc copper oxides. The structures of these materials, consisting of metal-oxygen layers stacked in a variety of sequences, with the metal atoms often in unusual coordinations, are intere…
Tension—tension cyclic loading tests have been conducted on a coarse‐grained alumina ceramic that exhibits toughnesscurve behavior by grain‐interlock bridging. Fatigue effects are observed in the regions of both short cracks, using indentation flaws, and long cracks, using compact‐tension specimens. A true mechanical…
Samples based on the intermetallic compound Al3Ti have been made by mechanical alloying the elemental components and sintering. Intense deformation of the compound was achieved by extrusion at 600°C and the mechanisms of deformation are examined. A major mode of deformation under such conditions is ordered twinning of…