Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble isomerization polymerization of 2-amino-2-oxazolines having four- to eight-membered cyclic imino substituentsMasatoshi Miyamoto, Masakazu Shimakura, Koji Tsutsui, Kiyoshi Hasegawa, Keigo Aoi, Seiji Yamaga, and Takeo SaegusaCite this: Macromolecules 1993, 26, 26, 7116–…
We first consider the effects of the crystal field on both the 4f ground state and the 5d excited state of a ${\mathrm{Ce}}^{3+}$ ion in the paramagnetic medium ${\mathrm{CeF}}_{3}$, and further take account of the splitting of the crystal-field ground-state levels caused by the effective superexchange field ${\mathit…
Galvanostatic measurements, intermittent titration experiments, and x‐ray diffraction analysis indicate that the cathode reaction mechanism in a nonaqueous secondary battery is an intercalation process. The measurements also yielded kinetic parameters such as the chemical diffusion coefficient and mobility of Zn in as…
Abstract.- Depth-sensing submicron indentation testing was used to measure the elastic-plastic behavior of sintered chromia and oxide scales formed on pure chromium in air. The use of top-down indentations limited the amount and precision of the scale data due to surface roughness and substrate effects. Nevertheless,…
Abstract Polyphosphate esters were synthesized from derivatives of cardanol phosphorodichloridateates and dihydric phenols by interfacial polycondensation using a phase transfer catalyst. The polymers were characterized by IR, 1 H‐, 13 C‐, and 31 P‐NMR spectroscopy, and GPC. The thermal stability and thermal degradati…
Photochemical degradation of natural rubber (NR) yield amine-terminated liquid natural rubber (ATNR) when carried out in solution in presence of ethylene diamine. The ATNR on reaction with glyoxal yielded polyschiffs base. This polyschiff's base was found to improve the ageing resistance of natural rubber.
Abstract This investigation extends our previous investigations of liquid crystalline polyurethanes prepared from 4,4′‐bis(2‐hydroxyethoxy)biphenyl (BHBP), 2,4‐tolylene diisocyanate, and poly(oxytetramethylene)diols as the flexible spacers. The influence of molecular weight of investigated polyurethanes on their prope…
Multiband Hubbard and Pariser-Parr-Pople calculations have been carried out on mixed donor-acceptor (DA) stacks with doubly degenerate acceptor orbitals and nondegenerate donor orbitals at two-thirds filling. Model exact results for 2, 3, and 4 DA units show that McConnell's prediction of high-spin ground states in th…
We present computer simulation results of a solution of multiblock copolymers, and show that a network can form under certain conditions. This network formation is due to a bridging effect, which exists for multiblock but not for diblock copolymers. Because of this special property, we suggest that multiblock copolyme…
The Deposition by Aqueous Acetate Solution (DAAS) technique has been developed for the preparation of thin films of Pb(Zr0.53Ti0.47)O3[PZT(53,47)] perovskites. This process, which employs titanium acetate, tends to establish a chemically bound network in the pre-annealed phase and facilitates the crystallization of fe…
The oxidation of both low and high-activity simple and Pt-modified aluminide coatings on nickel base superalloy IN738 has been studied in static air at 1100 °C up to 1000 h. For all coatings oxidation followed a parabolic law up to 400 h. The two Pt-modified coatings showed better protectiveness with lower mass gains…
Dielectric properties and lattice parameters of nonstoichiometric strontium titanate were systematically investigated. The X-ray diffraction measurements indicated the formation of SrO·(SrTiO 3 ) n ( n =4-53) instead of SrTiO 3 with excess Sr. Epitaxial films grown on (111)Pt/(100)MgO by an ArF excimer laser ablation…
Several homologous series of liquid crystals having an aminoketone mesogenic core (Liq. Cryst., 10, 593 (1991)), have been synthesized to derive some new wide-temperature untilted smectics. Compounds belonging to three of six novel series have the hexatic smectic B phase between smectic A and enantiotropic crystal sme…
The cavitation damage resistance of several fiber reinforced polymeric composite systems was evaluated before and after seawater immersion via a modified ASTM G-32 method utilizing a stationary specimen. For both dry and saturated condi tions, a carbon fiber/thermoplastic toughened epoxy matrix composite (IM7/977-2T)…
Abstract In Part I of this work, experimental data showed that the effect of low concentrations of free radical initiator injected into polyethylene during extrusion depended upon the degree of unsaturation and branching in the feed as well as the molecular weight. This paper shows attempts to quantitatively explain t…
This paper presents a formulation in dimensionless terms of the equations pertaining to first‐order processes that follow Arrhenius kinetics, and applies them to problems in food thermoprocessing. the need for it arose from attempts to understand the relation between destruction of pathogenic microorganisms and format…
Transmission electron microscopy on Mg-end member majorite crystals synthesized at 22 GPa and above 2350°C reveals a modulated microstructure, characterized by mutually intersecting linear contrasts parallel to the tetragonal {101} planes, with a typical wavelength of the modulation between 150 and 300 A. Streaking pe…
Summary A non‐isothermal method for determination of diffusional parameters was developed. the dependence of diffusivity on temperature was described by an Arrhenius type equation, with the pre‐exponential factor and the activation energy as parameters. These parameters were obtained by optimization of the fit between…
Abstract The solubility behaviour of β‐cyclodextrin in aqueous mixtures was studied by determining the interactions between the co‐solvent and water. Three clear classes of co‐solvent are evident. In the first, including ethanol, tetrahydrofuran and acetone, there is formation of clathrate hydrates by the co‐solvent.…
A factor which determines the network structure of diborate glasses containing divalent cations was proposed on the basis of structural studies by a combination of diffraction methods (x-ray and neutron), computer simulation and Raman spectroscopy. Structural analysis revealed that the network of Ba0.2B 2 O 3 and Pb0.…