Materials Literature
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Abstract A new method for the synthesis of compact, multifunctional star‐shaped polystyrenes was designed. A plurifunctional metalorganic initiator is obtained upon reaction of potassium naphthalene with commercial divinylbenzene. The resulting polymeric “core” exhibits a number of metalorganic sites. In a subsequent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a series of polyimides derived from 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]bis[1,3-isobenzofurandione]G. Ronald Husk, Patrick E. Cassidy, and Karen L. GebertCite this: Macromolecules 1988, 21, 5, 1234–1238Publication Date (Print…
The effect of argon ion bombardment on the structure and properties of thick copper films was studied. Primary deposition variables were ion flux, ion energy, substrate temperature, and substrate type. The effects of ion bombardment are profoundly different at high energy (600 eV) as opposed to low energy (62 eV). Tre…
Abstract— Zinc phthalocyanines sulfonated to different degrees are tested for their ability to sensitizeV–79 Chinese hamster cells andEMT–6 mouse mammary tumors to red light. In vitro , the lower sulfonated derivatives were the most active with the exception of the poorly water‐soluble monosulfonated dye. An isomeric…
Layer structures in chiral smectic C ( S C * ) phases were studied by high-resolution X-ray diffraction. The existence of a chevron layer structure was confirmed even in thick cells such as 350 µm and even in a compound with the phase sequence of N * - S C * . Cells made by a SiO oblique-evaporation technique gave two…
The results of photoionization mass spectrometric studies on B2H6, and BH3 (produced by pyrolysis of B2H6) are presented. The photoion yield curves of B2H+n (n=2–6) and BH+n (n=2–3) from B2H6, as well as BH+n (n=1–3) from BH3 have been obtained. It is shown that the combination of appearance potential measurements for…
The edge curling wall (ECW) is observed in an optical Kerr microscope. Conditions are derived energetically favoring single transverse domains with ECWs over other multiple closure domains or single longitudinal domains that are undesirable because of their low permeability. Computed figures illustrate how the maximum…
ABSTRACT The term nuclear matrix was first introduced by Berezney & Coffey (1974) to denote a highly structured residual framework obtained from rat liver nuclei by sequential salt extractions, detergent and nuclease treatments. The isolated three-dimensional structure consisted almost entirely of protein. Subsequ…
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…