Materials Literature
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A magnetic suspension densimeter is described that has been built for measuring the density of compressed liquids at pressures up to 15 MPa in the temperature range 20°–200°C with an uncertainty of 0.1%. The densimeter combines the principle of magnetic levitation of a buoy with that of liquid density determination by…
Dielectric properties of rutile (TiO2) doped with chromia (Cr2O3) have been measured as a function of frequency between 30 Hz and 60 kHz at temperatures between 77 and 350 K. Two types of specimen were produced. One sort was prepared by heating (001) sections of rutile in Cr2O3 pellets at 1173–1137 K for various times…
Abstract Theoretical substituent effects upon the acidity of the title compounds were investigated using STO ‐3 G basis sets augmented by diffuse functions for all oxygen atomic centers of the probe groups. The results are discussed in connection with the available gas‐phase data within a novel conception of attractiv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane waste recycling. 2. Polyol recovery and purificationJacob Braslaw and John L. GerlockCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 3, 552–557Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissue 1 July 1984…
The pathways for catabolism of fructose were investigated in the type strains of Azospirillum lipoferum and Azospirillum brasilense grown aerobically with (NH4)2SO4 as the nitrogen source. When grown on fructose, the former species possessed a complete Entner-Doudoroff pathway, whereas the latter species lacked activi…
Abstract Heteropoly acid (HPA) was used as an oxidant in the Wacker catalyst system. Among the catalyst systems examined, the PdSO4–H3PMo6W6O40 catalyst system showed the highest activity with regard to the oxidation of cycloolefins, particularly cyclopentene and cyclohexene, to the corresponding cyclic ketones. The l…
Abstract This paper discusses some new mechanical and small angle neutron scattering (SANS) data on glassy polymers, both thermoplastics and thermoset resins, from the point of view of dislocation‐like defects introduced in the molecular chain arrangement by deformation. In the pre‐yield stage, a new parameter, the wo…
Nonevaporable getters have wide applicability for developing the tritium handling techniques for thermonuclear fusion devices. From this viewpoint, mechanisms of the absorption and desorption of hydrogen isotopes and the isotope effects were investigated for a Zr–V–Fe alloy (St-707) by means of the mass analyzed therm…
Abstract Most useful plastics and rubber products are mixtures of pure polymers or copolymers with a variety of additives such as pigments, stabilizers, antioxidants, flame retardants, crosslinking agents, fillers, reinforcing agents, plasticizers, foaming agents, etc. Moreover, much attention is being placed recently…
Circular dichroic spectroscopy clearly reveals a solvent-induced conformational change of insulin in the presence of zinc ions. The spectral change corresponds to an increase in helix content. The transition observed in solution is an equivalent of the 2Zn----4Zn insulin transformation in the crystal. This is inferred…
Abstract (Zn, Mn)S mixed crystals with Mn concentrations up to 32 mol% and electron‐beam evaporated (Zn, Mn)S thin films are studied by photoluminescence emission, excitation, and decay measurements in the temperature range2 to 300 K. Besides the usual yellow an additional red emission band is observed with the same e…
Abstract The placement of ionic groups within the molecular structure of a polymer produces marked modification in physical properties. A large number of studies have been performed on these ion‐containing polymers, but few have focused on the effects of anion–cation interactions (i.e., counterion binding or ionizatio…
Streptomyces griseus synthesizes proline for osmoregulation under salt stress. Uptake of exogenous [14C]proline and internal synthesis of proline were quantified in cells growing at salt concentrations from 0 to 1 M NaCl. Externally supplied proline accounted for an increased proportion of the intracellular pool of fr…
The developments of the last decade are reviewed on a technical basis for heat-resistant alloys in application to the high-temperature structural components of the process heating high-temperature gas-cooled reactor. The major activities have fallen into two categories: the near-term development for the experimental r…
Abstract A series of uniaxially drawn films has been prepared from isotropic, amorphous poly(ethylene terephthalate) (PET) by using solid‐state coextrusion below its T g . To evaluating the crystallization behavior of the coextrudates, the cold‐crystallization temperature T c , Crystallization rate constant k , and ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe reaction of aromatic molecules in the interlayer of transition-metal ion-exchanged montmorillonite studied by resonance Raman spectroscopy. 1. Benzene and p-phenylenesY. Soma, M. Soma, and I. HaradaCite this: J. Phys. Chem. 1984, 88, 14, 3034–3038Publication Date (Print)…
Abstract Hard‐segment model compounds containing one to five 4,4′‐methylene bis( p ‐phenylisocyanate) (MDI) units extended with 1,4‐butanediol (BD) were synthesized. The ends of the model compounds were reacted with ethanol. The melting point ( T m ) of the model compounds increased with the number of MDI units to an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDepression of glass transition temperature in aramid-polybutadiene multiblock copolymersTakashi Inoue, Shinichi Ogata, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1984, 17, 7, 1417–1419Publication Date (Print):July 1, 1984Publication History Published online1…
When a metal is deformed cold, a small fraction of the energy expended in its deformation is stored in the crystal lattice associated with crystal defects and their elastic strain fields. There is evidence that grains having different orientations store different amounts of strain energy, although the data available a…
Abstract Highly oriented polyacetylene was synthesized using nematic liquid crystals as polymerization solvent