Materials Literature
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Abstract Chemiluminescence has been used to study the thermooxidation of poly(phenylene sulfide) film at 85–110°C in oxygen. To identify reaction products, the degraded surfaces were immediately analyzed by x‐ray photoelectron spectroscopy, then exposed to light and reanalyzed. In the proposed reaction sequence, thiyl…
The wavelength and temperature dependences of the principal refractive indices ( n e and n o ) of a ferroelectric SmC * liquid crystal were measured by using the Fabry-Perot interference technique in the surface stabilized cell. The refractive indices have a normal wavelength dispersion similar to a nematic liquid cry…
Abstract The crystallization behavior of poly(ethylene terephthalate) (PET) was studied by the methods of small angle light scattering, depolarized light intensity and density measurements. Spherulite growth rates and the overall rates of crystallization were determined at various temperatures. A detailed analysis of…
Free‐radical polymerizations of triallyl cyanurate (TAC) and its isomer triallyl isocyanurate (TAIC) were conducted in bulk at 60°C. In the polymerization of TAIC, gelation occurred at 12.4% conversion, quite early compared to 21.3% for TAC. The primary chain length of TAIC polymer, as estimated from GPC‐LALLS measure…
Compressive strength is critical to the performance of ceramics in armor, machine tool bits, and compressively loaded structural components. Traditional compression tests yield misleadingly low values for high strength ceramics. A new test, utilizing a dumbbell-shaped specimen, has been developed and has successfully…
An Electrochemical Monitor for the Detection of Coating Degradation in Atmosphere, Simpson, Theresa Comeau, Moran, Patrick J., Moshier, William C., Davis, Guy D., Shaw, Barbara A., Arah, Chike O., Zankel, Kenneth L.
Abstract Dehydroxylation of synthetic and natural goethites with a range of Al-substitution from 0–28 mole% was investigated with a view to predicting the behaviour of soil goethites heated by bush fires. Hematites formed at temperatures ≤ 500°C retain the initial Al-content of the precursor goethite up to a maximum o…
Abstract The surface‐enhanced Raman scattering of cyclohexanethiol was investigated in a silver sol. Cyclohexanethiol was found to adsorb dissociatively after losing its thiol proton and adsorption was found to occur via its sulphur atom. Both the equatorial and axial chair conformers were found to exist on the surfac…
Abstract not Available.
The Seebeck coefficients of oxygen and hydrogen electrodes on a stabilized zirconia at 1273 K were estimated to be −0.303 and 0.265 mV K −1 , respectively. Thus, the entropy changes of oxygen and hydrogen electrodes at 1273 K were calculated to be −58.4 J/1/2 mole oxygen in air and 51.1 J/1 mole hydrogen in a gas mixt…
Flocculating a boehmite sol with ammonia results in drying and shrinkage uniformity which contributes to the formation of a dry monolithic gel. It is demonstrated that flocculation immobilizes the randomly dispersed platelet‐shaped boehmite particles, inducing uniform shrinkage and density in the gel structure. Floccu…
Abstract Organic C contents, specific surface and P adsorption of pseu‐doboehmites or x‐ray noncrystalline precipitation products of Al formed in the presence of various organic ligands (citric, tartaric, tannic or aspartic acid) and Cl were studied before and after oxidation treatment of NaOCl or H 2 O 2 . Contents o…
The Jones matrix representation is used to obtain an analytic closed-form expression for the optical transmission of a general double-layer twisted nematic (TN) liquid-crystal display with arbitrary twist angles and uniform pretilt angles. Based on this result, the optimum off-state design criteria for both single-lay…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonequilibrium calcium oxide-magnesium oxide solid solutions produced by chemical decompositionGiorgio Spinolo and Umberto Anselmi-TamburiniCite this: J. Phys. Chem. 1989, 93, 18, 6837–6843Publication Date (Print):September 1, 1989Publication History Published online1 May 20…
Abstract Poly(3‐methylthiophene) films were potentiostatically and galvanostatically synthesized on platinum electrodes in acetonitrile using lithium perchlorate, lithium tetrafluoroborate, tetra‐ n ‐butylammonium perchlorate, and tetra‐ n ‐butylammonium tetrafluoroborate as supporting electrolytes. Cyclic voltammetri…
The photo‐oxidation mechanisms of methanol, formaldehyde, and formic acid, which are potentially “current‐doubling agents,” were investigated using the RRDE technique. The disk electrode was n ‐ TiO 2 and was illuminated by a xenon lamp while the ring electrode was Pt. Hydrogen ion, generated at the disk during the ox…
Three new compounds, Ag 2 HgGeS 4 , Ag 2 HgSnS 4 , and Ag 2 HgSnSe 4 , crystallizing in the wurtzstannite type structure have been prepared by solid state reactions at 700°C and characterized by X-ray powder methods. A fourth compound of similar composition Ag 2 HgGeSe 4 , with an hitherto unknown structure crystalliz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe microstructures of commercially available poly(3-hydroxybutyrate-co-3-hydroxyvalerate)sYoshio Inoue, Naoko Kamiya, Yasuhiko Yamamoto, Riichiro Chujo, and Yoshiharu DoiCite this: Macromolecules 1989, 22, 9, 3800–3802Publication Date (Print):September 1, 1989Publication Hi…
The effect of hot isostatic pressing on the bend strength of ZrO 2 –3 mol% Y 2 O 3 was critically dependent on the presintering process. Optimally sintered bodies contained no open porosity and exhibited large increases in strength following hot isostatic pressing. When open porosity of as little as 0.3% persisted aft…
The microhardness of mullite single crystals was measured at temperatures to 1000°C. The hardness decreased from about 15 GPa at room temperature to about 10 GPa at 1000°C. Thus, the mullite at 1000°C had a higher hardness than sapphire, approaching the value of SiC, but at room temperature was softer than both materi…