Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCationic ring-opening polymerization of spiroorthoester: polymer structure, polymerization mechanism, and volume change on polymerizationSatoyuki Chikaoka, Toshikazu Takata, and Takeshi EndoCite this: Macromolecules 1992, 25, 2, 625–628Publication Date (Print):January 1, 199…
The specific heat and thermal diffusivity of Sr1−xBaxNb2O6 (x=0.33 and 0.48) single crystals have been measured between 130 and 500 K, and the sound velocity has been measured at 295 K. At x=0.33 the specific heat shows a broad peak at 335 K, indicating the onset of a ferroelectric phase transition. The peak sharpens…
FTIR spectra are reported of CO, CO2, H2 and H2O on silica-supported potassium, copper and potassium–copper catalysts. Adsorption of CO on a potassium/silica catalyst resulted in the formation of complexed CO moieties. Whereas exposure of CO2 to the same catalyst produced bands ascribed to CO–2, bidentate carbonate an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetailed chemical kinetics study of the role of pressure in butane pyrolysisRichard G. Mallinson, Robert L. Braun, Charles K. Westbrook, and Alan K. BurnhamCite this: Ind. Eng. Chem. Res. 1992, 31, 1, 37–45Publication Date (Print):January 1, 1992Publication History Published…
An introduction to thermoplastic composite materials components of a thermoplastic structural composite product forms the microstructure of aromatic polymer composites processing science and manufacturing technology dimensional stability the strength of thermoplastic composites durability temperature sensitivity envir…
The available experimental thermoydnamic data for NaCl(cr) have been fitted in order to generate thermodynamic values as a function of temperature and for a nominal pressure of 0.1 MPa. Thermal measurements (heat-capacity values and enthalpy-increment values) have been fitted with a new method. The fitted function and…
It is shown that a wideband lumped parameter equivalent circuit of a potential transformer can be determined through parametric system identification by the least squares method. Because of limitations in the measuring equipment, up to four different sets of input/output signals are necessary. Compared with other test…
Poly(pyridine-2,5-diyl)(PPy) exhibits heterogeneous and visible-light-induced photocatalysis toward the reduction of water, carbonyl compounds and alkenes in the presence of triethylamine (TEA) as a sacrifical electron donor. The water reductive H2 evolution is ehnanced by colloidal noble metals concurrently photoform…
The cold rolling behavior of solidified columnar crystals in a 19% Cr ferritic stainless steel has been investigated in order to clarify the effects of the initial orientation of each columnar grain and of the interaction with adjacent grain in a polycrystalline specimen. The specimen showed {001}<uv0> texture before…
Crystallographic orientation relationships of α phases precipitated on dislocations and deformation twin boundaries in the β matrix have been investigated in a Ti–15V–3Cr–3Sn–3Al alloy, by means of transmission electron microscopy (TEM).Planar and widely spaced, {112}〈111〉β slip bands are formed by weak rolling at roo…
Magnetic Barkhausen noise (MBN) measurements were made on a sample of pipeline steel as functions of magnetizing frequency and AC flux density in the sample. The observed MBN responses suggest a strong dependence on these magnetizing parameters. With increasing flux density in the sample, the MBN activity initially in…
Four novel antifungal compounds, gamahonolides A and B, gamahorin, and 5-hydroxyl-4-phenyl-2(5H)-furanone, were isolated from stromata of Epichloe typhina on Phleum pratense. Their structures were determined by spectroscopic methods. The absolute configuration of gamahonolide A was determined by its ORD spectrum and (…
After partial discharge activity within a gaseous void, charges accumulate on the wall of the void. The decay of such charges due to surface currents at the void wall is studied analytically, and the factors affecting this decay are indicated. The results show that in terms of the basic time constant, the decay can ta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA highly rigid capped porphyrinJennifer A. Wytko, Ernest Graf, and Jean WeissCite this: J. Org. Chem. 1992, 57, 3, 1015–1018Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegmental motions of cis-polyisoprene in the bulk state: interpretation of dielectric relaxation dataI. Bahar, B. Erman, F. Kremer, and E. W. FischerCite this: Macromolecules 1992, 25, 2, 816–825Publication Date (Print):January 1, 1992Publication History Published online1 Ma…
A review is presented on the available results of the corrosion of Co, Ni, Cr, Fe and their alloys in oxidizing and in oxidizing/sulphidizing atmospheres in the presence of chlorine. The thermodynamic aspect of the reactions between the metal and chlorine or hydrogen chloride are discussed using stability diagrams. Th…
Anthraquinone‐1‐sulfonate incorporated in polypyrrole films as a fixed dopant ( PPy / AQ ‐ SO 3 − ) shows redox activities involving two‐electrons, resulting in the apparent enhancement of the quantity of electricity in the redox reactions of the polypyrrole films. The utilization of the polypyrrole moiety of the PPy…
Silicon oxynitride ceramics were reaction sintered and fully densified by hot isostatic pressing in the temperature range 1700°C to 1950°C from an equimolar mixture of silicon nitride and silica powders without additives. Conversion to Si 2 N 2 O increases steeply from a level around 5% of the crystalline phases at 17…
The surfaces of Ti-Zr alloys before and after immersion in an electrolyte which contains inorganic ions found in the biological system were characterized using X-ray photoelectron spectroscopy (XPS), in order to know the changes in the surfaces of the system. Plates of Ti-25Zr, Ti-50Zr, Ti-60Zr, and Ti-75Zr alloys (in…
Abstract The effect of dopants and level of doping on the thermal stability of polypyrrole at 90, 120 and 150°C in dry air and nitrogen was investigated by monitoring the decay of conductivity. Polymers doped with aromatic anions ( p ‐toluene sulphonate and p ‐chlorobenzene sulphonate) exhibit better stability than po…