Materials Literature
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This paper presents the results of experiments to investigate the effects of temperature on the dezincification and corrosion of 70–30 brass in 0·5 M H2SO4, Zinc and copper losses from specimens tested at various temperatures were estimated at various time intervals by atomic absorption spectroscopic analysis of the c…
Abstract Halato‐telechelic polyurethane‐ureas were synthesized from divalent metal salts of p ‐aminobenzoic acid, 4,4′‐diaminodiphenylmethane (4,4′‐methylenedianiline, MDA), dialkylene glycols, and 2,4‐toluylene diisocyanate (TDI). As the divalent metal, Mg and Ca were used, and diethylene glycol and dipropylene glyco…
There are many ongoing U.S. aerospace programs which have identified requirements for higher temperature capability from conventional titanium alloys. In order to meet these requirements, two new titanium alloys have been developed. A near alpha alloy, designated "Ti-1100" (Ti-6Al-2.7Sn-4Zr-0.4Mo-0.45Si), is a modific…
Treatment of [Mn4O2(OAc)7(bpy)2](ClO4)·3H2O (bpy = 2,2′-bipyridyl)1 with Me3SiCl in MeCN leads to a disproportionation and nuclearity change to give [Mn11O10Cl2(OAc)11(bpy)2(MeCN)2(H2O)2](ClO4)2·8MeCN 2; the crystal structure shows the core of this aggregate to comprise two [Mn4O3Cl]6+ cubane units ‘bridged’ by a near…
The $^{39}\mathrm{K}$ electric field gradient (EFG) and chemical-shift tensors have been determined in KSCN above and below ${\mathit{T}}_{\mathit{c}}$. Whereas all the data below ${\mathit{T}}_{\mathit{c}}$ are compatible with the site symmetry of the ${\mathrm{K}}^{+}$ ions given by the space group ${\mathit{D}}_{2\…
The paper describes a study of surface-charge deposition on insulating spacers under impulse-voltage conditions, using an electrode arrangement which allows scanning of the entire surface of the spacer with a capacitive probe. For a plain cylindrical spacer in SF6 at 1 bar, significant charge deposition was recorded f…
Mechanical properties of beta titanium alloys strongly depend on the precipitation behavior of alpha, which is controlled by thermo-mechanical treatments. To obtain high strength beta titanium alloys, uniform distribution of fine alpha precipitates is required, and various thermo-mechanical treatments have been develo…
High resolution 27Al magic-angle spinning nuclear magnetic resonance (MAS NMR)(78.15 MHz) spectra are reported for boehmite and pseudoboehmite and for calcines occurring in their thermal transformation sequences (involving γ, δ, θ and α-aluminas). Spectra for boehmite, pseudoboehmite and corundum (α-alumina) are fully…
The formation behavior of the alloy layer in the initial stages of galvanizing at 450°C has been investigated, using ultra low carbon Ti added steel sheet. The formation of Fe-Zn intermetallic compounds on the steel surface was retarded with the increase of Al content in galvanizing bath. For high Al content in the ba…
The domain switching of ferroelectric triglycine sulfuric acid and Rochelle salt was studied by observing optical gyration along the ferroelectric axes and measuring rotation of the indicatrices around the same axes. It was established experimentally that the antipolar domains of triglycine sulfuric acid were united b…
Small-angle X-ray scattering (SAXS) measurements have been carried out in order to investigate the size of micropores in activated carbon fibres (ACF) and the apparent change in size for different relative humidities. The scattering intensity at smaller angles and the gyration radius Rg increase at first with increasi…
Chemisorption of 2-mercaptobenzimidazole onto a chemically cleaned surface of metallic copper from its ethanol solution has been investigated by the use of surface-enhanced Raman scattering, X-ray-induced Auger spectroscopy and infrared spectroscopy. 2-Mercaptobenzimidazole reacts directly with metallic copper to form…
On addition of optically-active ammonium ions the helical pitch of cholesteric liquid crystals containing steroidal crown ethers changes in an enantioselective manner: in certain cases the difference in the colour change can be visually detected.
Reduction of 4′,4″-dinitro-o-terphenyl under conditions of high dilution, produces a mixture of macrocyclic poly(azobenzene) compounds. From the mixture, three kinds of macrocycle, namely, dimer 2{dibenzo[2.2](4,4′)azobenzenophane}, trimer 3 and tetramer 4 have been isolated pure. In toluene, absorption peaks due to t…
Article Crystal structure of potassium phyllo-dithioindate(III), KInS2 was published on January 1, 1991 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 195, issue 3-4).
Abstract The synthesis of poly(2,6‐dimethyl‐1,4‐phenylene oxide) with one 2,6‐dimethylphenol chain end (PPO–OH) and with well‐defined molecular weight by phase transfer catalyzed polymerization of 4‐bromo‐2,6‐dimethylphenol ( 20 ) in the presence of either 2,4,6‐trimethylphenol ( 1 ) or 4‐ t ‐butyl‐2,6‐dimethylphenol…
The adsorption of benzene on clean and ammonia-covered titania samples has been studied by FTIR spectroscopy. Special attention has been paid to the stretching vibrations of surface hydroxy groups. The presence of coordinated ammonia does not affect the ν(OH) bands of free surface TiOH groups, although surface Ti—O st…
The variations, with humidity, of the positive DC corona-current voltage characteristics and of sparkover stresses have been studied in rod-plane gaps of spacings in the range 10≤d≤150 cm. The steady component of the current in the glow regime is described by the square law equation over the whole range of gaps, requi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(2-oxazoline) macromonomers having a vinyl ester groupHiroshi Uyama and Shiro KobayashiCite this: Macromolecules 1991, 24, 2, 614–615Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https:/…
The cold rolling effect of β single-phase on α precipitation behavior and the mechanical properties were studied using a Ti-15V-3Cr-3Sn-3Al metastable β alloy. The β single-phase material was prepared by heating the alloys above the β transus temperature followed by quenching in water, and subsequent aging at the (α+β…