Materials Literature
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Abstract A typical intumescent fire retardant additive for polypropylene, which is a mixture of ammonium polyphosphate and pentaerythritol, does not sensibly modify the photooxidative behaviour of unstabilized polypropylene whereas it modifies that of polypropylene stabilized with a substituted o‐hydroxybenzophenone a…
The temperature dependences of the dielectric properties, conductivity, spontaneous polarization as well as the effect of hydrostatic pressure on the anomalies of these properties have been investigated. The β-TlInS2 crystals are shown to be often a mixture of the polytypes. Transition into a ferroelectric state for s…
There is considerable interest in understanding the surface oxidation reactions of transition-metal alloys with potentially useful magnetic properties. These reactions can either lead to passivation or corrosion of the magnetic film under normal atmospheric conditions. Little is known, however, about the surface oxida…
The purpose of this Recommended Practice is to familiarize users with the issues involved with processes using toxic, flammable, or corrosive gases for the deposition or etching of semiconducting, metallic, or insulating films. We examine the general concerns for handling these gases, discuss the nature of several pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of sequence distribution on the critical composition difference in copolymer blendsJohan Van Hunsel, Anna C. Balazs, Ronald Koningsveld, and William J. MacKnightCite this: Macromolecules 1988, 21, 5, 1528–1530Publication Date (Print):May 1, 1988Publication History Pub…
Abstract Untwinned albite (Ab 99.4 An 0.4 Or 0.2 ) grains, forming during diagenesis and very low-grade metamorphism, are common in sandstones of the Brøttum Formation (Upper Proterozoic) in the Sparagmite Region of southern Norway. These untwinned albite grains are usually clouded by vacuoles and tiny inclusions whic…
Amorphous hydrogenated carbon films prepared by glow discharge decomposition of CH4 at a power density of 0.4 W cm−2 were bombarded with hydrogen and nitrogen ions of energies between 100 and 600 keV. The structural changes due to various ion doses were analyzed using Raman, photoluminescence, and infrared spectroscop…
A new method was developed for removing bronze disease and for the conservation of ancient copper and copper-based artifacts. An organic compound, 2-amino-5-mercapto-l,3,4-thiadiazole was found to be a good inhibitor. It removes the bronze disease completely and forms a protective polymeric complex layer on the surfac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBand structures of polyfulvene and related polymers. A model for the effects of benzannelation on the band structures of polythiophene, polypyrrole, and polyfulveneJulianto. Pranata, Robert H. Grubbs, and Dennis A. DoughertyCite this: J. Am. Chem. Soc. 1988, 110, 11, 3430–34…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of cyclohexane at approximately 810.degree.CF. Billaud, P. Chaverot, M. Berthelin, and E. FreundCite this: Ind. Eng. Chem. Res. 1988, 27, 5, 759–764Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May…
An extensive glass‐forming region has been determined for the lead fluorosilicate system. These glasses have a very high anionic (fluorine) conductivity. The value of 2 x 10 ‐4 ω ‐1 .cm ‐1 at slightly less than 200°C found for one glass is the highest anionic conductivity reported to date in a glass. Glass transition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure and property changes accompanying hard-segment crystallization in block copoly(ether-ester) elastomersJanis Castles Stevenson and Stuart L. CooperCite this: Macromolecules 1988, 21, 5, 1309–1316Publication Date (Print):May 1, 1988Publication History Published…
Abstract Measurements of thermal conductivity of amorphous Si films from 2 to 50 K are presented. The qualitative and quantitative behaviour is similar to thermal conductivity of other amorphous dielectrics. The temperature range of the plateau of λ( T ) correlates with the maximum T m = 30 K of the function c / T 3 (…
A new asymmetric domain for intercrystalline misorientation is defined in the space of Euler angles for materials exhibiting cubic (Oh point-group) lattice symmetry. The invariant measure for this new domain is nearly constant; this is in significant contrast to the previous domain defined by MacKenzie [Biometrika (19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural characterization of bismuth molybdates by x-ray absorption spectroscopy and powder neutron diffraction profile analysisMark R. Antonio, Raymond G. Teller, Donald R. Sandstrom, Meho Mehicic, and James F. BrazdilCite this: J. Phys. Chem. 1988, 92, 10, 2939–2944Publi…
We derive a dynamical equation for the stochastic motion of a vortexlike point disclination in thin smectic-C and -${C}^{\mathrm{*}}$ liquid-crystal films. The inertial mass results from flow-induced distortions of the director structure in the core region, while the friction force is due to energy dissipation accompa…
Abstract 1. Ethylene-propylene elastomers, suitably compounded for extrusion applications, can be readily vulcanized with organic peroxides to meet emerging requirements of improved performance and longer service life. 2. Aralkyl or dialkyl classes of peroxides produce the preferred cure performance, highest physical…
Solvent-cast films of styrene-butadiene-styrene triblock copolymer (SBS) were synthesized and a poly(2-hydroxyethyl methacrylate) (PHEMA) layer was grafted onto these films using Co 60 gamma-ray irradiation. The IR absorption spectrum of the graft copolymer was taken and its surface morphology studied by a scanning el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermoanalytic investigations on mixed crystals of the spin-crossover system [FexZn1-x(2-pic-ND2)3]Cl2.EtODR. Jakobi, H. Spiering, L. Wiehl, E. Gmelin, and P. GuetlichCite this: Inorg. Chem. 1988, 27, 10, 1823–1827Publication Date (Print):May 1, 1988Publication History Publi…
Nd-Fe-B permanent magnets from two different manufacturers were irradiated in the Omega West reactor at Los Alamos National Laboratory, with fast neutrons at temperatures of 426 K (153 degrees C) and 350 K (77 degrees C) to fluences of 5.0*10/sup 16/ N/cm/sup 2/ and 6.1*10/sup 16/ N/cm/sup 2/, respectively. At interva…