Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymers derived from hexafluoroacetone: 12F-poly(ether ketone)Gordon L. Tullos, Patrick E. Cassidy, and Anne K. St. ClairCite this: Macromolecules 1991, 24, 23, 6059–6064Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue…
A full study of parity-broken states in the directional solidification of lamellar eutectics is performed within the boundary-integral formulation. Symmetric states cease to exist at a wavelength \ensuremath{\lambda}, which is approximately twice that corresponding to their minimum undercooling, whereas solutions with…
The mechanism of degradation, or IR drop, of BaTiO 3 ‐based Ni‐electrode chip capacitors has been studied, with special attention to the microstructure. Degradation occurred mainly at the center of the capacitors. Longer‐life capacitors were obtained under conditions of low oxygen partial pressure, 10 −12 atm, during…
A chaperonin has been purified from a thermophilic bacterium, Thermus thermophilus. It consists of two kinds of proteins with approximate Mr 58,000 and 10,000 and shows a 7-fold rotational symmetry from the top view and a "football"-like shape from the side view under the electron microscopic view. Its weak ATPase act…
Abstract The reactive type copolymers styrene maleic, anhydride (SMA) and styrene glycidyl methacrylate (SG) are used as in situ compatibilizers in polyblends of polystyrene (PS) and nylon 6, 6 (N66). Both copolymers can react with N66 to form copolymers as effective compatibilizers to reduce interfacial tension and i…
Surfaces of polyethylene and polyimide films were treated in NH3 and N2 plasma using ‘‘dual-frequency’’ excitation: The samples were exposed to a microwave (2.45 GHz) glow discharge, while variable radio frequency (13.56 MHz)—induced negative direct current bias voltage values were simultaneously applied. The surface…
The dynamics of carbon monoxide oxidation on Pd, Rh, and Pt foils were probed under nearly collision-free conditions using high resolution infrared chemiluminescence. Auger electron spectroscopy was used to verify the absence of impurities on the surfaces. The reactants were supplied to the surface through a free jet…
Communication: Processability, flexibility, transparency , and a lack of grain boundaries are some of the attractive properties of amorphous molecular materials. For their integration into electronics, however, it is important that the materials can form stable amorphous, glassy states with a glass‐transition temperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydroxylation of polyisoprene via addition of haloacetic acids to the double bondYoung H. Kim and Ashish PandyaCite this: Macromolecules 1991, 24, 24, 6505–6511Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November…
Abstract Linear low density polyethylenes are manufactured by copolymerizing ethylene with 1‐alkenes, yielding a linear polyethylene backbone with short side chains. Due to the nature of the catalyst used in the polymerizaton, multimodal branching distributions are typically obtained. In this report, we have investiga…
LEED I(V) data comprising three non-degenerate beams have been collected at normal incidence from the cleaved (001) surface of TiO 2 . Care has been taken to minimize the effects on the I(V) data of electron beam damage to the surface. Analysis of the I(V) data has been carried out using tensor LEED theory and a searc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMelting and recrystallization during mesophase transitions of a thermotropic liquid crystalline polymerJoonhyun Nam, Tomohiro Fukai, and Thein KyuCite this: Macromolecules 1991, 24, 23, 6250–6253Publication Date (Print):November 1, 1991Publication History Published online1 M…
Magnetic properties of polycrystalline thin films of chromium chalcogenide spinels, i.e., ${\mathrm{CdCr}}_{2}$${\mathrm{Se}}_{4}$ lightly doped with indium and ${\mathrm{CdCr}}_{2\mathit{x}}$${\mathrm{In}}_{2\mathrm{\ensuremath{-}}2\mathit{x}}$${\mathrm{Se}}_{4}$, are studied. The ferromagnetic- and spin-wave-resonan…
Temperature dependence of magnetocrystalline anisotropy was measured for Co-Ti-Sn substituted Ba ferrite particles, to clarify the origin of a small temperature dependence of coercivity (dHc/dT) for this material. For comparison, the same measurement was carried out for Co-Ti substituted particles which have positive…
The RESRAD code is a pathway analysis code that is designed to calculate radiation doses and derive soil cleanup criteria for the US Department of Energy's environmental restoration and waste management program. the RESRAD code uses various pathway and consumption-rate parameters such as soil properties and food inges…
Using high-resolution electron beam lithography, we have fabricated metal–semiconductor–metal photodetectors with sub-50 nm finger spacing and finger width on GaAs grown by molecular beam epitaxy, which are, to our knowledge, the smallest ever reported. dc measurements showed that they have low dark current and high s…
Abstract We investigated soil mineral weathering sequences in three geologically distinct high‐elevation areas of southern Appalachian spruce‐fir ( Picea rubens Sarg.‐ Abies fraseri [Pursh.] Poir) forests in order to elucidate the pedogenic factors that distinguish these unique soils from their low‐elevation counterpa…
Abstract α‐Methyleniedane (MI), a cyclic analog of α‐methylstyrene which does not undergo radical homopolymerization under standard conditions, was synthesized and subjected to radical, cationic, and anionic polymerizations. MI undergoes radical polymerization with α,α′‐azobis(isobutyronitrile) in contrast to α‐methyl…
The time evolution of Debye-Scherrer lines was investigated in metal-tritium-helium systems by neutron-scattering techniques. Polycrystalline samples of ${\mathrm{TaT}}_{\mathit{x}}$, ${\mathrm{YT}}_{\mathit{x}}$, and ${\mathrm{ScT}}_{\mathit{x}}$ were measured over a period of three years. The results show that heliu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectroelectrochemical studies of tin(II) porphyrinsK. M. Kadish, D. Dubois, J. M. Barbe, and R. GuilardCite this: Inorg. Chem. 1991, 30, 24, 4498–4501Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue…