Materials Literature
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This review includes new developments in aromatic sulfide and sulfone thermoplastics, electroconductive and electrooptical polymers, polymeric sulfur cements and coatings, sulfonated polymers, and rubber vulcanizing agents. New agrochemicals include sulfonylurea herbicides, and tetrathiocarbonate soil fumigants. A new…
Upon hydrogenation of magnesium in THF using homogeneous magnesium‐anthracene transition‐metal halide catalysts in the presence of small amounts of MgCl 2 and solubilizing agents L, a dissolved form of magnesium hydride (MgH' 2 ) is produced. The preferred L's are quinuclidine (QC) or organomagnesium compounds; howeve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Eudesmanolides from Sphaeranthus indicusMohammed Saleh Shekhani, Pir Muazzam Shah, Khalid Mohammed Khan, and Atta-ur-RahmanCite this: J. Nat. Prod. 1991, 54, 3, 882–885Publication Date (Print):May 1, 1991Publication History Published online1 July 2004Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of (octaethylporphinato)cobalt(II), (OEP)Co, under a carbon monoxide atmosphere. Electrogeneration and characterization of [(OEP)CoIII(CO)]+Y. Hu, B. C. Han, L. Y. Bao, X. H. Mu, and K. M. KadishCite this: Inorg. Chem. 1991, 30, 10, 2444–2446Publication Date…
Abstract Instrumented impact testing of linear low density polyethylene (LLDPE I) (ethylene and 1‐octene copolymer) was carried out using a Rheometrics Drop‐Weight Tester (RDT‐5000). A method of partial penetration at controlled impact energy was used and developed. The set impact speed was raised step by step in smal…
Abstract The measurement of parison swell is difficult because swell is a time‐dependent phenomenon and because, for a parison, two independent swell ratios must be determined. A new technique has been developed that makes use of a video camera focused on the end of the parison. Unlike previous techniques designed to…
Abstract MoO 3 thin films after irradiated with a UV light showed enhancement in electrochromism when compared to the non‐irradiated ones. It was found that the change in absorbance for the irradiated portion was as large as six times that of the non‐irradiated portion of a sample. This enhancement in electrochromism…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of microstructure in poly[(p-hydroxybenzoic acid)-co-(ethylene terephthalate)] using nuclear magnetic resonance spectroscopyKarl R. Amundson, Jeffrey A. Reimer, and Morton M. DennCite this: Macromolecules 1991, 24, 11, 3250–3260Publication Date (Print):May 1, 1…
The cold-rolled and recrystallization textures of Fe-Cr-Co-Mo permanent magnet alloys are described. The studied composition is Fe-30%Cr-15%Co-3%Mo (in wt.%). The cold-rolled texture can be considered to be [111], [111], [100], and [211], while the recrystallization texture can be considered to be [111], [110], [211],…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix infrared study of the neodymium-doped yttrium aluminum garnet laser depolymerization products of solid phosphorus oxide (P4O10)Matthew McCluskey and Lester AndrewsCite this: J. Phys. Chem. 1991, 95, 9, 3545–3549Publication Date (Print):May 1, 1991Publication History P…
The standard split‐Hopkinson bar data reduction procedure assumes uniform conditions exist over the length of the specimen allowing the average stress‐strain response to be computed. When the stress wave enters the specimen, a gradient is established along its longitudinial axis. To use the standard analysis, approxim…
Abstract Gel fraction and equilibrium elastic modulus of networks formed from α, ω‐dihydroxypoly(oxypropylene) and bis(4‐isocyanatophenyl)methane (MDI) as a result of side reactions were compared with theoretical predictions based on the theory of branching processes (Macromolecules, 23, 1774 (1990)). If isocyanate is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton-assisted photoinduced electron transfer from porphyrin to quinone: a photo-CIDNP and laser flash photolysis studyDevens Gust, Thomas A. Moore, Ana L. Moore, Xiaochun C. Ma, Ronald A. Nieman, Gilbert R. Seely, Robert E. Belford, and Jeffery E. LewisCite this: J. Phys.…
In view of the observation that a CHCl3-soluble fraction of the MeOH extract of Chrysosplenium grayanum has shown cytotoxic activity in the KB cell in vitro system, the fraction has been further fractionated to furnish five known flavonoids (chrysosplenols B, D, and E, retusin, and brickellin), 3,5-dihydroxy-4-methoxy…
Anionic copolymerization of elemental sulfur (S8) with cyclic monosulfides (thiiranes) is shortly reviewed. More recent work on homopolymerization of cyclic trisulfides (1,2,3-trithiolanes) and their copolymerization with S8 is discussed in more detail. Anionic homopolymerization of cyclic trisulfides is a living, hig…
The ARIES-I reactor is a 1000-MWe, DT-burning tokamak reactor that combines present-day physics with advanced engineering technology such as high-field superconducting magnets and low-activation SiC composites as structural material. Recent developments in the manufacturing of fiber-reinforced ceramics for improved me…
Dielectric and X-ray diffraction measurements were used to characterize the structural phase transition occurring in antiferroelectric Pb(Yb 1/2 Nb 1/2 )O 3 compound. Dielectric behavior for ceramics shows a sharp transition with a large temperature hysteresis of about 6°C near transition temperature. The lattice para…
Real time spectroscopic ellipsometry from 1.5 to 4.0 eV has been applied to monitor surfaces of optical quality diamond thin films during exposure to low energy Ar and H ion beams, and atomic H. Monolayer-level sensitivity to the conversion of diamond to optically absorbing sp2 bonded carbon upon ion impact is demonst…
Das konformativ flexible „molekulare Rohrstück”︁ 1 a läßt sich durch Cyclisierung entsprechender [3.3]Phane nach dem Verdünnungsprinzip herstellen. Die Bildung des Isomers 1 b mit gekreuzter Anordnung der Phan‐Einheiten kann aufgrund NMR‐spektroskopischer Befunde und mechanistischer Überlegungen ausgeschlossen werden.…
Abstract The intrinsic birefringence of rigid poly(vinyl chloride), PVC, was obtained from measurement of birefringence and infrared dichroism. Rigid PVC samples were stretched at temperatures above the glass‐transition temperature, T g , to various stretch ratios. The measured intrinsic birefringence obtained in this…