Materials Literature
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Abstract A thermodynamic analysis of the glass transition in polymers is presented, which predicts, with a minimum of assumptions, three of the four inequalities which have consistently been observed experimentally: i.e., that specific heat and isothermal compressibility of the glass are lower than those of the rubber…
Abstract The polyene formation during degradation of a commercial suspension‐polymerized poly(vinyl chloride) (PVC) in the solid state is discussed with respect to the PVC texture. Above the glass transition temperature ( T g ), the polyene length distribution is characterized by a high amount of very short polyenes (…
The basic principles of SF/sub 6/ as a dielectric gas and arc-interrupting medium are examined. The properties discussed are its high dielectric withstand of approximately=90 kV/cm-bar, its dielectric strengthafter decomposition, its suitable operating temperature range, its nontoxicity and chemical inertness, and the…
A laboratory scale gas gun and associated instrumentation have been designed and constructed as a tool for transverse impact experiments on composite materials at velocities in the range 200-750 m s -1 , using projectiles of 5.59 and 7.62 mm diameter (0.22 and 0.30 calibre respectively) which simulate fragments of lar…
Abstract Rotational molding grade polyethylene powders are classified according to sieve size, to typically–35 mesh, and by flowability, usually determined by pouring freeflowing powder from a funnel onto a fixed base cone. In the latter case, the static angle of repose is then measured. This study concentrates on gen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structure, and properties of manganese toluene-3,4-dithiolate complexes in different oxidation statesKlaus Greiwe, Bernt Krebs, and Gerald HenkelCite this: Inorg. Chem. 1989, 28, 19, 3713–3720Publication Date (Print):September 1, 1989Publication History Publishe…
Abstract From Ayou oil (essential oil of Aydendron barbeyana Mez. 50 constituents could be identified by 1 H‐NMR spectra and GC‐MS. Main constituents are β‐bisabolol (8%), (E)‐nerolidol (6%), ar ‐curcumene (6%), and δ‐cadinene (5%). The structures of a new sesquiterpene ether 1,11‐oxidocalamenene (29a) and of trans ‐s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure-induced phase transition of poly(oxymethylene) from the trigonal to the orthorhombic phase: effect of morphological structureMasamichi Kobayashi, Hirofumi Morishita, and Masaki ShimomuraCite this: Macromolecules 1989, 22, 9, 3726–3730Publication Date (Print):Septemb…
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…