Materials Literature
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Abstract Thermoset polyurethane (PU) elastomers were prepared using hydroxyl‐terminated polybutadiene (HTPB), toluene diisocyanate (TDI) and hexamethylene diisocyanate (HMDI). The effects of various diamines and diols on the mechanical and thermal properties of polyurethanes are discussed. The average molecular weight…
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Soymilk, a colloidal dispersion obtained by wet milling of soya bean (Glycine max (L) Merill), was subjected to the foam-mat drying process at 65°C using two foam stabilizers namely, carboxy methyl cellulose (CMC) and glyceryl distearate (GDS) at 5, 10 and 15% levels. While CMC did not produce a stable foam at any of…
A method has been proposed to estimate the grain size, which is defined as the grain size distribution in three dimensions, from the measured distribution of linear intercept length. The method is developed on the assumption that the grain size distribution is log normal in three dimensions. The three-dimensional grai…
Article Identification of Mixed Platinum States and Electronic Effects of Support on Platinum in Supported Catalysts* was published on January 1, 1991 in the journal Zeitschrift für Physikalische Chemie (volume 173, issue 1).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular dynamics of initial events in the thermal degradation of polymersMarc R. Nyden and Donald W. NoidCite this: J. Phys. Chem. 1991, 95, 2, 940–945Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991http…
Polyhydroxycarboxylates (MW: 3,800-14,000) derived from phenolic (PDP) compounds have been found to inhibit the cytopathicity of HIV-1 and HIV-2 in MT-4 cells at concentrations that are not toxic to the host cells. The PDP compounds also inhibited syncytium formation in cocultures of MOLT-4 cells with HIV-1- or HIV-2-…
Alloy 625 exhibits a complex precipitation behavior at elevated temperatures A severe loss of notch impact strength at room temperature after exposure in the temperature range of 600 -800C has been determined. This loss of ductility can be correlated above all to gamma double prime and carbide precipitation. The loss…
Reactions of o-, m- and p-C6H4(CN)2 with [SNS][AsF6] in liquid SO2 produced the AsF6– salts of o-, m- and p-[C6H4([graphic omitted])2]2+ in high yield. The para-phenylene AsF6– salt was readily converted (>75%) into other salts (Cl–, Br–, SbCl6– or S3N3–) by anion metathesis. Reduction of [p-C6H4-([graphic omitted])2]…
The PALLAS (discrete ordinates-integral transport) code was improved to include secondary sources, such as bremsstrahlung and fluorescence, to assure accurate and reliable results. The point buildup factors for high-Z materials were calculated with this code in the energy range of 0.015~15 MeV up to 40 mean free paths…
Abstract The formulae for critical absolute and relative growth velocities which govern the disappearance of faces have been derived and discussed. A face can disappear in the habit only if its velocity is greater than the critical one. Both the fast‐ and the slow‐growing faces can disappear. It was shown that B ORGST…
Ionic conduction by H+ and D+ in doped perovskites BaCe1 –xMxO3 –a(M = Y, Gd; x= 0.05, 0.10) at high temperatures in H2O- and D2O-moistened atmospheres is investigated. Conduction by hydrogen ions was confirmed by emf measurements on various gas cells using specimen ceramics as the solid electrolyte membrane separatin…
Current wave forms of the first Trichel pulses and initial stages of negative point-to-plane breakdown in carbon monoxide have been measured at a pressure of 13.33 kPa. The results include a report of the intricate pulse wave form with a step on the pulse leading edge and a current hump on the pulse trailing part, whi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of molecular architecture on the adsorption of copolymersAnna C. Balazs, Michael Gempe, and Christopher W. LantmanCite this: Macromolecules 1991, 24, 1, 168–176Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 Ja…
Optical probe-beam deflection signals, together with cyclic voltammograms, have been used to analyse the electron-transfer process at electrodes coated with [Ru(bpy)2ClPVP]Cl, polyaniline and poly(1-hydroxyphenazine). With this technique it is possible to determine if anions or cations are used as the charge-compensat…
Tensile, fracture toughness, and high cycle fatigue tests were done at 293, 77, and 4 K for Ti-6Al-4V alloys with three levels of oxygen content. The alloys were investigated both in as-forged condition and in the rolled condition. Rolling did not necessarily make α grains finer, but changed the shape from plate-like…
Enzymes acting on pyruvate as a parameter of the ATP regeneration system were studied as a cause of metronidazole resistance in Bacteroides fragilis NCTC 11295. The resistant strain had higher lactate dehydrogenase activity and produced more lactate than susceptible strains, suggesting that the enzyme is more active i…
Abstract X-ray diffraction (XRD) line-broadening analysis has been used to determine dislocation densities in zirconium alloys with hexagonal closepacked (hep) crystal structures and a complex distribution of dislocations reflecting the plastic, anisotropy of the material. The validity of the technique has been assess…
Novel surfactants with two long-chain alkyl groups and two sulfonate groups were synthesized by reactions of oligo (ethyleneglycol) diglycidyl ethers or bis (2, 3-epoxypropyl) ether with long-chain fatty alcohols, followed by reaction with propanesultone. The double-chain compounds showed good water solubility, excell…
Attempts were made to produce fatigue tolerant α-β titanium alloys by the blended elemental (BE) P/M method using extra low chlorine (ELCL) titanium powder. The study was conducted in two stages. In the first stage, the effect of microstructural modification on the high cycle fatigue strength of ELCL BE Ti-6A1-4V was…