Materials Literature
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Abstract The orientation characteristics of extruded poly(ethylene terephthalate) (homopolymer) sheets are discussed with respect to: mode of extension (simultaneous versus sequential), strain rate, stretch ratio, and temperature. The nature of the stress–strain curve recorded during the process of extension, and its…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBroadband dielectric study on binary blends of bisphenol-A and tetramethylbisphenol-A polycarbonateG. Katana, F. Kremer, E. W. Fischer, and R. PlaetschkeCite this: Macromolecules 1993, 26, 12, 3075–3080Publication Date (Print):June 1, 1993Publication History Published online…
Thin films of aromatic polyurea were prepared by simultaneous deposition of 4,4'-diamino diphenylmethane (MDA) and 4,4'-diphenylmethane diisocyanate (MDI) on a polyimide film substrate. By changing the evaporation temperature of the monomers, the monomer molar ratio of MDA to MDI of the deposited film was varied to yi…
The reaction between nitrogen gas and an intermetallic compound is studied, with particular reference to Sm2Fe17 , treating the Sm2Fe17Ny system as a gas-solid solution. A simple lattice gas model is used to describe the reaction of nitrogen atoms with the metal lattice in terms of the net reaction energy U0=−57±5 kJ/…
A finite element model capable of simulating solidification of binary alloys and the formation of freckles is presented. It uses a single system of equations to deal with the all-liquid region, the dendritic region, and the all-solid region. The dendritic region is treated as an anisotropic porous medium. The algorith…
Abstract Differential pulse polarography (DPP) and cyclovoltammetry (CV) were conducted to study the redox behaviour of poly( p ‐phenylenevinylene) (PPV; E = 0,76 V; E = −1,74 V) as well as of three insoluble PPV‐derivatives and four soluble aryl‐substituted PPV's. Oxidation studies of DP‐PPV, DMOP‐PPV and DPOP‐PPV in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics and phase transitions in spin-crossover complexes: x-ray structures and basic crossover phenomena in the solvate series bis(3-ethoxysalicylideneaziridinopropylaminato)iron perchlorate.solvateAndrew J. Conti, Raj K. Chadha, Kathryn M. Sena, Arnold L. Rheingold, and D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis and structure of molybdoarsenate [H4AsIII2AsVMoV8MoVI4O40]-, a bicapped, reduced Keggin speciesM. Ishaque Khan, Qin Chen, and Jon ZubietaCite this: Inorg. Chem. 1993, 32, 13, 2924–2928Publication Date (Print):June 1, 1993Publication History Published o…
The temperature evolution of the lattice parameters of lead phosphate, Pb 3 (PO 4 ) 2 , indicates three lattice instabilities with anomalies near 530, 453 and ca 430 K. Only the phase transition at 453 K is ferroelastic with a spontaneous strain e=(e 1 -e 1 0 0 e 5 0). Volume anomalies occur near 530 and ca 430 K that…
The gas-phase processes relevant for oxidation during growth of YBa2Cu3O7−δ (YBCO) films by pulsed laser deposition in different oxidizing ambients are discussed using a phenomenological model. The model consists of an accounting for the neutral species generated from the target during laser ablation, and their attenu…
couples were prepared from glass starting materials with one-half of the sample enriched in r8O and the other half containing the natural abundance (-0.2 wto/o). Following exchange ofO across this diffusion couple at high temperature and pressure, '8O concentration profiles were analyzed using an ion microprobe. O dif…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoregulated binding of spiropyran-modified concanavalin A to monosaccharide-functionalized self-assembled monolayers on gold electrodesItamar Willner, Shai Rubin, and Yael CohenCite this: J. Am. Chem. Soc. 1993, 115, 11, 4937–4938Publication Date (Print):June 1, 1993Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemkin-type model for the description of induced heterogeneity: CO adsorption on Group 4 transition metal dioxidesVera Bolis, Claudio Morterra, Bice Fubini, Piero Ugliengo, and Edoardo GarroneCite this: Langmuir 1993, 9, 6, 1521–1528Publication Date (Print):June 1, 1993Publi…
Abstract Lithium alkoxide‐initiated polymerizations of L ‐lactide were conducted in toluene at 50°C. The initiator solutions were prepared in situ from butyllithium and benzyl alcohol, 1‐tetradecanol, diethylene glycol monobutyl ether or poly(ethylene glycol) monomethyl ether. These lithium alkoxides initiate the poly…
Electron deficient paramagnetic vanadium(III) dialkyls CpV(CH2CMe2R)2(PMe3) (14 electron, R = Me (2), Ph (3)) and CpV[CH(SiMe3)2]2 (12 electron, 4) have been synthesized. At ambient temperature 2 decomposes through a-hydrogen abstraction to produce, in the presence of dmpe (1,2-bis(dimethylphosphino)ethane), the first…
The relationship between microstructure and electron characteristics of indium tin oxide (ITO) films was investigated. The microstructure and resistivity were found to be dependent on the oxygen partial pressure in the sputtering ambient. Lower resistivity ITO films had a domain structure and a small amount of surface…
Abstract Tensile yield stress measurements have been performed on a serie of four ethylene/1‐butene copolymers covering the crystallinity range 0.33–0.74. Samples have been prepared from melt‐crystallization and from solution‐crystallization at various concentrations in decalin in order to span a wide range of crystal…
The results of polarized Raman scattering, far-infrared (FIR) absorption, Kramers-Kronig analysis of FIR reflectance, and lattice-dynamical calculations of the perovskitelike compound ${\mathrm{YBaCuFeO}}_{5}$ (space group P4mm) are reported. All 16 Raman- and infrared-active \ensuremath{\Gamma}-point phonons (6${\mat…
The first-order Raman spectra of single-crystal cubic boron nitride for the range of 300 to 1830 K are presented. The Stokes and anti-Stokes components of both the TO (\ensuremath{\Gamma}) and the LO (\ensuremath{\Gamma}) modes are analyzed for their Raman shift and width variation with temperature. The cubic boron ni…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-transfer states of bridged transition metal dimers: mono- vs binuclear copper azide systems with relevance to oxy-hemocyaninFelix Tuczek and Edward I. SolomonCite this: Inorg. Chem. 1993, 32, 13, 2850–2862Publication Date (Print):June 1, 1993Publication History Publis…