Materials Literature
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The effect of molybdate ion on the corrosion of mild steel in an aggressive, low hardness water was investigated electrochemically. Studies were conducted with molybdate concentration ranging from 50 to 5000 mg/L in waters of pH 3, 5, 7, and 9. The effect of temperature and aeration was also investigated. In deaerated…
The kinetic characteristics and the controlling mechanism of steady-state creep were determined for NC–430 reaction-bonded silicon carbide which was subjected to high temperatures (1848 to 1923 K) and constant compressive stresses (110 to 220 MN/m2). Both as-received and as-crept materials were studied extensively by…
Abstract When H3PW12O40 solution was titrated with Cs2CO3 solution, Cs2PW12O40 was precipitated at the Cs/anion ratio of 0.5–2, while Cs3HPW12O40 was formed at the ratio of 3. Based on these results, the peculiar variation with x and heat-treatment observed for catalytic activity of CsxH3−xPW12O40 has been explained.
Abstract The morphology of isotropic films of poly[ N , N '‐bis(phenoxyphenyl)‐pyromellitimide] was investigated by means of small‐angle x‐ray scattering. A significantly different morphology was found to develop in these films as compared to that in films possessing as in‐plane molecular orientation. It was found tha…
Article Metallographic Differences Between Compacted Graphite Cast Iron and Vermicular Graphite Cast Iron / Unterschiede in der Gefügeausbildung von Gußeisen mit Kompaktgraphit und Gußeisen mit Graupelgraphit was published on June 1, 1984 in the journal Practical Metallography (volume 21, issue 6).
Abstract Optimal temperature profiles for nylon 6 polymerization in plug–flow reactors have been obtained with end‐point constraints involving the degree of polymerization and the cyclic dimer concentration, using the most recent kinetic information. Computations suggest that the temperature at the feed end of the rea…
Abstract The ability to predict the occurrence of plateout in PVC processing with a simple laboratory test which can be used to evaluate complete formulations before manufacture would be of significant benefit. Such a test is described and illustrated. A proposed mechanism for the induction of plateout based on attrac…
Analyses of self-excited, resonating jets have been corroborated by laboratory experiments. These structured jets achieved cavitation at greater ambient pressures and showed enhanced erosivity in comparison to the nonstructured jets from conventional drill bit nozzles.
Abstract Electron microprobe analysis of the new mineral scotlandite yielded Pb 72.27, S 9.95, corresponding to PbO 77.85, SO 2 19.88, sum 97.73 wt.%. Secondary ion mass spectrometry showed the absence of Li, Be, B, C, N, and F, but the presence of very small amounts of Br. Infrared spectroscopy showed that the minera…
A method of determining the centroid of space in two-side metallized, thin polymer films is discussed. The method is a generalization of the well-known thermal pulse method and allows the determination of the mean depth without knowledge of the sample history. Results for electron-beam charged Teflon FEP films (25 μm…
Abstract The effect of particle size, type of crucible, and heating rate on the thermal curves obtained simultaneously for CuSO 4 · 5H 2 O were discussed. The dissociation steps were confirmed. Thermogravimetric techniques for determining the rate‐controlling processes and kinetic parameters were applied for the dehyd…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermoreversible gelation of poly(4-methyl-1-pentene) in cyclopentane and cyclohexaneGerard Charlet, Hong Phuong Nguyen, and Genevieve DelmasCite this: Macromolecules 1984, 17, 6, 1200–1208Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHypersensitivity in the 4f .fwdarw. 4f absorption spectra of neodymium(III) complexes in aqueous solutionEileen M. Stephens, Karl Schoene, and F. S. RichardsonCite this: Inorg. Chem. 1984, 23, 12, 1641–1648Publication Date (Print):June 1, 1984Publication History Published on…
The Smith–Purcell radiation from a charge moving across a penetrable grating is studied. We account for the finite permittivity and the absorption effect of the grating and find that enhancement of the radiation will occur near particular angles of observation at which the phase-matching condition for the excitation o…
Abstract The amount of cationic soluble polymer fixed by cellulose fibres, whose specific surface area is increased by beating, was determined by a colloidal titration method. A linear relationship between the polymer uptake and the surface density of carboxyl groups was obtained up to a beating degree of 54°SR. For h…
The nematic lyophase of disodium cromoglycate dissolved in water can be made chiral by adding a wide variety of amino acids whose ability to induce helicity is systematically studied. Long, bulky side chains lead to small helical twisting power (HTP), whereas increased hydrophilicity of side chains leads to larger HTP…
Structural disorder in severely ground MgCl2 is interpreted on the basis of a Bernoullian model with four parameters, specifying both the size and the statistical sequence of the layers; their choice completely dictates the intrinsic shape of all the X-ray diffraction lines. The X-ray powder spectra are reasonably wel…
Abstract Copolymers of trans ‐4‐acryloxyazobenzene ( AAB ) with (−)‐menthyl acrylate ( MtA ) have been prepared by free radical initiation; comonomer reactivity ratios have been found to be r AAB = 0.89 and r MtA = 0.53. Dependence of chiroptical properties on copolymer composition has been investigated and contributi…
Abstract An attempt was made to produce a new short‐chain alphatic polyamide nylon‐4,2. This polyoxamide can be prepared by polycondensation of tetramethylene diamine and diethyl oxalate. A high molecular weight polymer (η inh = 1.9 from 0.5% solutions in 96% sulphuric acid) has been obtained by employing a two‐step p…
An analysis is presented of the thermal stresses in brittle ceramics subjected to thermal shock by quenching into a liquid medium in which conduction is the primary mechanism of heat transfer. The magnitude of maximum stress was shown to be a function of the coefficient of thermal expansion, Young's modulus, and Poiss…