Materials Literature
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Phase relations for the bulk composition LiA1Sis01z (system LiA1Si04-SiOz-HzO) have been investigated experimentally over the range 340-950°C and 0.5-6.0 kbar P(HzO). Stability relations among eucryptite, spodumene, petalite, ,B-spodumene (tetragonal), and virgilite (hexagonal) have been determined for quartz-saturate…
Abstract Oxygen and water vapor permeability studies were carried out on binary polyethylene/polyamide immiscible blends incorporating three polyethylene resins (LDPE, LLDPE, and HDsPE), and three polyamide resins (PA‐6, PA‐6,6, and modified PA‐6,6m). It was found that the incorporation of PA into PE reduces the oxyge…
The effect of temperature on grain boundary sliding has been studied for <10l0) tilt boundaries with different misorientations in zinc bicrystals. The temperature dependence of the average sliding rate for high-angle grain boundaries changes at certain transition temperature Tc , which changes from 0–7Tm to 0–9Tm, whe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper(II), a chemical Janus: two different (oxalato)(bipyridyl)copper(II) complexes in one single crystal. Structure and magnetic propertiesMiguel Julve, Juan Faus, Michel Verdaguer, and Alain GleizesCite this: J. Am. Chem. Soc. 1984, 106, 26, 8306–8308Publication Date (Pri…
Advancements in the speed and input/output (I/O) density of integrated circuits (IC's) used in computers and other high performance systems are creating a need for new designs, materials, and processes capable of providing high density multilayer interconnections with controlled electrical characteristics. To meet the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic properties of (.mu.-terephthalato)bis[(N,N,N',N",N"-pentamethyldiethylenetriamine)aquocopper(II)] perchlorate and (.mu.-terephthalato)bis[(N,N,N',N",N"-pentaethyldiethylenetriamine)copper(II)] perchlorateMichel Verdaguer, Jacqueline Gouteron,…
Abstract Viscosity–molecular weight characterization of poly(ethylene terephthalate) (PET) in hexafluoroisopropanol (HFIP), pentafluorophenol (PFP), and HFIP/PFP is reported for the first time using size exclusion chromatography‐low angle laser light scattering (SEC–LALLS) measurements. These strong solvents are capab…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-diffusion coefficient in melts of linear polymers: chain length and temperature dependence for hydrogenated polybutadieneCraig R. Bartels, Buckley Crist, and William W. GraessleyCite this: Macromolecules 1984, 17, 12, 2702–2708Publication Date (Print):December 1, 1984Pu…
A combined torsion and compression mode of deformation has been used to deform copper and silver to equivalent tensile true strains of ≃ 8. The microstructures have been determined by transmission electron microscopy. It has been found that at true strains within the range 4–8 there is no change in microstructure or V…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygenation patterns for iron(II) porphyrins. Peroxo and ferryl (FeIVO) intermediates detected by proton nuclear magnetic resonance spectroscopy during the oxygenation of (tetramesitylporphyrin)iron(II)Alan L. Balch, Yee Wai Chan, Ru Jen Cheng, Gerd N. La Mar, Lechoslaw Lato…
A review of the ferroelectricity in liquid crystals is given, beginning with a discussion of the symmetry properties allowing a macroscopic polarization in some of the more ordered liquid crystal phases. The fundamental mechanisms behind the dipolar ordering are discussed in some detail. The two linear electric effect…
The infrared spectra of butyl pyridinium chloride/aluminum chloride and 1-methyl 3-ethyl imadazolium chloride/aluminum chloride room temperature molten salts have been examined over a range of mole ratios (acidities). Bands observed in the 4000-630/cm range have been assigned and spectral changes attributed to the for…
Secondary ion mass spectrometry was used to profile the interdiffusion of network oxygen in a Si 16O2-Si 18O2 thin-film structure. The diffusivity from 1200 to 1400 °C can be described by D=2.6 cm2 s−1 exp (−4.7 eV/kT). The diffusivity values are lower, but with a higher activation energy, than those previously report…
Abstract The reduction in molecular dimensions due to the presence of short side chains in otherwise linear polyolefins can very simply by calculated by assuming that the configuration of the main chain is not influenced by the side chains. This enables us to express the intrinsic viscosity–molar mass relationship as…
The biquadratic coupling between the tilt and polarization is added to the usual bilinear coupling in the Landau free energy density expansion describing the SmA - SmC* transition. The effect on the temperature dependence of the tilt, spontaneous polarization and the pitch of the helix is studied. The results agree qu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock copolymers near the microphase separation transition. 2. Linear dynamic mechanical propertiesFrank S. BatesCite this: Macromolecules 1984, 17, 12, 2607–2613Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 Decemb…
Heterocyclic conducting polymer films are prepared by the oxidative cationic polymerization of thiophene, pyrrole and furan. Electrical and optical properties of these polymer films are similar to those using electrochemically prepared polythiophene, polypyrrole and polyfuran.
A simple method for measuring frictional stresses between the mairix and individual fibers in a ceramic composite is described. A standard microhardness indenter is used to apply a force to the end of the fiber and depress it below the matrix surface. The frictional stress is calculated from measurement of the applied…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe 1- and 2-dimensional tungsten-183 and vanadium-51 NMR characterization of isopolymetalates and heteropolymetalatesPeter J. DomailleCite this: J. Am. Chem. Soc. 1984, 106, 25, 7677–7687Publication Date (Print):December 1, 1984Publication History Published online1 May 2002…
The green primary compound of chloroperoxidase was prepared by freeze-quenching the enzyme after rapid mixing with a 5-fold excess of peracetic acid. The electron paramagnetic resonance (EPR) spectra of these preparations consisted of at least three distinct signals that could be assigned to native enzyme, a free radi…