Materials Literature
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Transformation‐range viscosity and thermal expansion measurements were made for five series (Li‐Na, Li‐K, Li‐Cs, Na‐Cs, and K‐Rb) of mixed‐alkali borate glasses containing 30 mol% total alkali oxide. In each case, negative deviations from additivity were observed in the isokom and glass transformation temperatures. Po…
Structural parameters determined for crystalline iron, fayalite and aegirine agree closely with X-ray crystallograhic data. A glass of NaFeSi2O6 composition has Fe predominantly present as Fe3+ in tetrahedral coordination i.e. as a network former. CaFeSiO4 and CaFeSi2O6 glasses have about 1/3 of the total Fe in octahe…
The behavior of isoprene and styrene polymerizations initiated by the complex of n-butylsodium and n-,s-dibutylmagnesium (sodium tributylmagnesiate) has been examined. The styrene-benzene system was found to yield stable active centers and polymers of predictable molecular weight and narrow molecular weight distributi…
Parabariomicrolite _BaTa401O(OHh.2H20 is rhomb,9hedral, spac~ group R3m, with a 7.4290(6), c 18.505(2) A, V 884.5(1) A, Z = 3. The ~trongest six lines in the X-ray powder pattern [d in A(I)(hkl)] are 6.18(50)(00.3), 3.172(65)(02.1), 3.085(41)(00.6), 3.040(10.0)(20.2), 2.641(50)(02.4), 1.591(42)(22.6). Electron-micropr…
Abstract Samples of PVC, plasticized with a range of aliphatic and aromatic esters, were naturally weathered by exposure for one year in Arizona. Standard weathering tests involve inclining the plasticized PVC sheets at 45 degrees to the horizontal facing south. In this way, the greatest exposure to sunlight is achiev…
Abstract New donors, “TTF-dimer”s in which two TTF units are perpendicularly fixed have been synthesized. Redox potentials indicate that their donor abilities are somewhat reduced compared with those of corresponding “TTF-monomer”s. Present donors form CT complexes with DDQ.
SUMMARY Ten naturally acidic Scottish soils have been limed with CaCO 3 at 0,0.25, 0.50, 0.75, 1.00 and 1.25 times the recommended lime requirement, and then subjected to three cycles of alternate wetting to field capacity at 20°C for 1 month and drying for 1 month. The Zn, Cu, Fe and Mn extracted by DTPA solution, bo…
Isotactic polybutene (PB) can be quenched into a completely glassy state by quenching molten films into a solid-liquid mixture of isopentane, Freon, or ethanol. The crystallization of PB from the glass form was studied by x-ray scattering, differential scanning calorimetry (DSC), and dynamic mechanical spectroscopy (t…
Abstract Polymers having oxide network chains are produced by hydrolytic polycondensation of metal alkoxides and alkoxysilanes. Molecular morphology and molecular size distribution of these inorganic polymers are strongly affected by certain nonchemical parameters. Included among these parameters is the molecular sepa…
One of the unit operations in foam technology is foam generation in a liquid/gas mixer. The foaming process of an aqueous liquid system with a surface‐active agent in a rotor‐stator mixer has been studied, and it was found that it could be represented by a mixing characteristic relating the liquid flow rate to the max…
The theory of the Lifshitz point, a triple point in the phase diagram of systems with incommensurate phases, is extended to systems in which the direct para-ferro transition is first order. The structure of the phase diagram is shown to be considerably more complex than in the usual case of a second-order direct trans…
Abstract This paper reports a rapid method to identify the presence of nonswelling clay, swelling clay, or a mixture of the two types of clays in a soil from the sediment volumes occupied by 10 g of dry soil in 100 mL of water and carbon tetrachloride, respectively, under no external constraint. Soils that occupy a se…
The ultrasonic degradation of poly(vinyl alcohol) (PVA) in aqueous solution and copolymerization of PVA with acrylonitrile (AN) were studied. It is confirmed that the rate of degradation of PVA follows the kinetic equation suggested by Baramboim. Both water-soluble and water-insoluble copolymer can be obtained by chan…
Abstract By means of cationic ring‐opening polymerization a wide variety of telechelic polymers can be prepared. After a general description of the chemistry of this kind of polymerization, the introduction of functional end groups by initiation, by end capping and by transfer reactions is described. The following mon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation and characterization of a five-coordinate manganese(III) porphyrin cation. Crystal and molecular structure of aquo(tetraphenylporphinato)manganese(III) triflateMichael M. Williamson and Craig L. HillCite this: Inorg. Chem. 1986, 25, 26, 4668–4671Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA picosecond study of rapid multistep radiationless decay in manganese(III) porphyrinsXinwei Yan, Christine Kirmaier, and Dewey HoltenCite this: Inorg. Chem. 1986, 25, 26, 4774–4777Publication Date (Print):December 1, 1986Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tetrakis(tetraethylammonium) dodecachlorotetracuprate(4-), a new structural type for a tetranuclear copper(II) halide complexR. D. Willett and Urs GeiserCite this: Inorg. Chem. 1986, 25, 25, 4558–4561Publication Date (Print):December 1, 1986Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Styrene/Maleimide Copolymers and Physical Properties ThereofEugene Moore and Dale PickelmanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 4, 603–609Publication Date (Print):December 1, 1986Publication History Published online30 January 2004Published inissu…
Liquid crystal material photostability was investigated for application in high intensity projectors operating with both near ultraviolet (UV) and visible light. Commercially available mixtures were studied in transparent test cells and their lifetimes were correlated with their chemical structures. Substantial improv…
Abstract Heat capacities were measured for poly(4‐methylstyrene) [300–500K], poly(4‐fluorostyrene) [130–350K], poly(4‐chlorostyrene) [300–550K], poly(4‐bromostyrene) [300–550K], poly(4‐iodostyrene) [300–550K] and poly(styrene‐ co ‐divinylbenzene) with 1, 2, 4, 8, and 12 wt.% divinylbenzene (technical grade) [300–550K]…