Materials Literature
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Abstract Phase separation behavior has been studied in aqueous solutions of partially butyralized poly(vinyl alcohol) (BuPVA) with various degrees of butyralization x Bu and various molecular weights. It is found that these systems exhibit both upper and lower critical solution temperatures. The theta temperatures θ L…
SUMMARY The combination of a scanning electron microscope and a microcomputer can be used to carry out automatic, quantitative, morphological analysis of a wide range of samples. A system implemented around a commercially available 8‐bit computer and interface hardware is described. Computerized analysis of shape is m…
The relation between fibre crimp and fabric quality is investigated for various fabrics of different grades. It is found that fibres taken from fabrics of good quality have a high crimp level and that fibre crimp plays an important role in yarn extensibility, compressibility, and fabric extensibility and improves fabr…
The magnetic structure and magnetic phase transitions of Sc 1- x Ti x Fe 2 with x ≧0.7 are studied from measurements of Mössbauer effect and magnetization. A coexistent state of ferro- and antiferromagnetism appears below ∼100 K for x =0.9 and below ∼200 K for x =0.75. The results suggest that this system is an itiner…
Abstract In a one‐band model, the total carrier mobility relations, deduced from the Debye‐Conwell formula and Mathiessen's rule, are compared. With the help of these two laws the resultant mobility and the thermoelectric power (TEP) kinetic term variations are given. For n‐type MoTe 2 single crystals, it is shown tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotodecomposition of nitromethane trapped in solid argonMarilyn E. JacoxCite this: J. Phys. Chem. 1984, 88, 15, 3373–3379Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissue 1 July 1984https://pubs.acs.org/doi/10.1021/j150659a…
Abstract Zeolite ZSM-5 was easily synthesized by using ZSM-5 seed crystals as crystallization nuclei from acetone/water mixture system without any organic templates. A small amount of acetone in a reaction mixture inhibited formation of α-quartz and facilitated rapid crystallization of ZSM-5 under the mild hydrotherma…
Abstract The crystal of (TMTTF)2ReO4 is isomorphous with the other (TMTTF) 2X compounds(X=ClO4, PF6, Br,···). TMTTF molecules are stacked face-to face to form a zig-zag column. Although the structure of (TMTTF)2ReO4 closely resembles that of the analogous compound, (TMTSF)2ReO4, the loose intermolecular contacts in (T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical synthesis of a new polysaccharide. Ring-opening polymerization of 1,6-anhydro-2,3,4-tri-O-benzyl-.beta.-D-allopyranose and preparation of stereoregular 1→ 6)-α-D-allopyrananToshiyuki Uryu, Yoshihiro Sakamoto, Kenichi Hatanaka, and Kei MatsuzakiCite this: Macromolecu…
Hastelloy-X is a potential structural material for use in gas-cooled reactor systems. In this application, data are necessary on the mechanical properties of base metal and weldments under realistic service conditions. The test environment studied was helium that contained small amounts of H2, CH4, and CO. This enviro…
Abstract Block and random copolymers of butadiene and styrene as well as polybutadiene and polystyrene homopolymers have been investigated with respect to formation of trapped electrons, contribution of ionic species to crosslinking, and hydrogen gas evolution due to γ radiation. The decay kinetics of the disubstitute…
The role of defects in heterojunctions was investigated. The density of such defects required to pin the Fermi level or to affect the band offset was estimated using simple electrostatic considerations. We conclude that it is very unlikely that defects play any role in determining the band offsets, but they might affe…
Abstract The products resulting from the reaction of PVC with sodium benzenethiolate were degraded to 0,3% at 180°C in the solid state and at 160°C in solution in trichlorobenzene. The polyene distribution of the polymers after degradation was studied by both UV‐visible and resonance Raman spectroscopies, as a functio…
The correlation between microstructure, tarnish, and corrosion behavior of a commercial dental Ag-Pd-Cu-Au casting alloy after various heat treatments was studied. The attacked structural components were identified by comparing SEM micrographs with light optical micrographs taken after exposure of the alloy to a 2% Na…
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…