Materials Literature
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Abstract The areas under the linear loss modulus versus temperature curves (loss area, LA) and tan δ versus temperature curves (TA) were evaluated for a number of acrylic, methacrylic, styrenic and butadiene based copolymers and interpenetrating polymer networks, IPNs, as a function of crosslink density and comliositi…
Abstract Four 15 g samples of an unsedimented Wyoming bentonite were treated with 200 cm 3 of 0·025, 0·050, 0·100 and 0·250 mol dm −3 H 2 SO 4 for 1 h at room temperature (samples I–IV, respectively). Three further 15 g samples were treated with 200 cm 3 of 50% (v/v) H 2 SO 4 for 1 h at 20°C (sample V), and 1 and 2 h…
Abstract Polycarbonate together with the acrylonitrile/butadiene/styrene copolymers, and the poly amides constitute the leading groups of engineering thermoplastics; for polycarbonate in particular, continued dynamic growth is prophesized. The underlying reason for this lies not only in its outstanding combination of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of (octaethylporphyrinato)lutetium and -yttrium complexes: synthesis and reactivity of (OEP)MX derivatives and the selective activation of O2 by (OEP)Y(.mu.-Me)2AlMe2Colin J. Schaverien and A. Guy OrpenCite this: Inorg. Chem. 1991, 30, 26, 4968–4978Publication Date…
Abstract Commingled fabrics composed of yarns containing both the reinforcement and the matrix in fiber form are an innovative preform for thermoplastic composite materials. The material is consolidated into a rigid structure by the application of heat and pressure. A mathematical model of the consolidation process fo…
A kinetic and ultraviolet–visible study of a series of thermo- and photochromic dyes is reported. Ultraviolet irradiation of the indolino-benzospiropyran derivatives 1′–4′ leads to their transformation to the open-chain, colored merocyanine forms, which undergo thermal ring closure into the colorless spiro forms. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly delocalized Cu(I)/Cu(II); a copper-copper bond?Charlie Harding, Vickie McKee, and Jane NelsonCite this: J. Am. Chem. Soc. 1991, 113, 25, 9684–9685Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 December 1991ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple intramolecular electron transfer in the catalysis of the reduction of dioxygen by cobalt meso-tetrakis(4-pyridyl)porphyrin to which four Ru(NH3)5 groups are coordinatedChunnian Shi and Fred C. AnsonCite this: J. Am. Chem. Soc. 1991, 113, 25, 9564–9570Publication Dat…
Methods, implemented into a computer program ( LSABS ), are described which calculate transmission factors and their first derivatives with respect to the positions of the faces of a convex polyhedral monocrystal. Both Gaussian and analytical integration procedures are considered in detail. LSABS has been implemented…
Article Alkylpolyglucoside - physikochemische Eigenschaften und Anwendung / Alkylpolyglucosides, their Physico-chemical Properties and their Uses was published on December 1, 1991 in the journal Tenside Surfactants Detergents (volume 28, issue 6).
Ausgeprägte Lewis‐Acidität ist die Erklärung für die außergewöhnliche Aktivität der Titelverbindung in der katalytischen Olefin‐Epoxidierung mit Wasserstoffperoxid. Das System MTO/ t ‐C 4 H 9 OH/H 2 O 2 epoxidiert selektiv und effizient Olefine unter sehr schonenden Bedingungen (‐ 30 bis + 60°C, in der Regel Raumtempe…
We have found a decrease in the intensity of the 7.6-eV band and the appearance of the Si-H band upon heating ${\mathrm{SiO}}_{2}$ glasses, which were prepared by a method involving processes of dehydration with ${\mathrm{Cl}}_{2}$ gas, in ${\mathrm{H}}_{2}$ gas. The absorption cross section of the 7.6-eV band evaluat…
A novel serine/threonine protein kinase (termed rac-PK) has recently been identified and cloned from cDNA libraries derived from the human cell lines MCF-7 and WI38. A second form of this protein kinase, termed rac protein kinase beta, has been identified from cDNAs derived from the same cell lines. These two closely…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of chromyl nitrate (CrO2(NO3)2) in the gas phase: a novel form of coordination for chromium?Colin J. Marsden, Kenneth Hedberg, M. M. Ludwig, and Gary L. GardCite this: Inorg. Chem. 1991, 30, 25, 4761–4766Publication Date (Print):December 1, 1991Publicatio…
Infrarødspektra, vaterit, calcit, analysis
Experiments investigating thermocavitation in binary solutions induced by continuous laser radiation are described. The cavitation consists in periodic rise and collapse of vapor-gas bubbles, accompanied by hydraulic shocks. The necessary condition for obtaining periodic pressure pulses by thermocavitation are investi…
Two mesongenic homologous series containing azo group are synthesized. The esters of Series II, III and IV exhibit only the smectic phase. The smectic phase exhibits focal conic or fan-shaped textures. Members of Series I exhibit nematic phases, whereas the members of Series II and IV exhibit enantiotropic smectic pha…
The corrosion rate and changes in the microstructure and fracture strength of alumina ceramics (93.0% Al 2 O 3 and 99.5% Al 2 O 3 ) were studied in 0.1 m to 25 m NaOH solutions at 150°C to 200°C, where m = mol/(kg of H 2 O). The attack of the caustic alkaline solution started at the grain boundaries. Consequently, the…
Data have been obtained for the rate of reaction of freshly generated iron surfaces at low potentials with aqueous solutions containing chloride ions. The presence of chloride ions accelerates the formation of the first monolayer of oxidized iron, but with no significant increase in the charge required to form it. The…
The fabric geometric models based on lamination analogy and stiffness averaging method are utilized to numerically characterize a 2-step braided composite. The model predictions were found to be in good agreement with results of mechanical tests performed in this study. The architecture of this material is investigate…