Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of chloro(phthalocyaninato)gallium(III), Ga(Pc)Cl, and chloro(phthalocyaninato)aluminum(III), Al(Pc)ClKenneth J. WynneCite this: Inorg. Chem. 1984, 23, 26, 4658–4663Publication Date (Print):December 1, 1984Publication History Published online1…
c-axis oriented thin films of piezoelectric ZnO have been deposited on room-temperature substrates by rf magnetron sputtering of zinc in a reactive ambient of 100% oxygen over a pressure range from 5–70 mTorr. Below 10 mTorr the film structure, orientation, and physical properties depend on the position of the substra…
Coir ( Cocos nucifera ), a ligno-cellulosic fiber, is cheap and abundant in the coastal regions of tropical countries. In this paper the effect of physical and chemical treatments on the mechanical properties of coir fibers is reported. Changes in moisture regain, crystallite orientation, and percentage crystallinity…
We derive a cluster expansion for the effective dielectric constant ε* of a dispersion of equal-sized spheres distributed with arbitrary degree of impenetrability. The degree of impenetrability is characterized by some parameter λ whose value varies between zero (in the case of randomly centered spheres, i.e., fully p…
Abstract A study of the mercerization of ramie cellulose was begun using x‐ray diffraction, in order to determine the types of alkali–cellulose structures that occur as intermediates during the conversion of cellulose I to cellulose II. A total of five unique alkali–celluloses (Na–celluloses) could be generated reprod…
Abstract X‐ray scattering patterns from amorphous polymers frequently contain halos corresponding to distances significantly greater than that of van der Waals packing of carbon atoms. Regularities in the positions of such halos as a function of pendant group size have been reported, primarily for the “crystallizable”…
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…