Materials Literature
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The ordinary refractive index and the birefringence are reported for two homologous series of nematic liquid crystals, the p,p′-di-n-alkyl and p,p′-di-n-alkoxy azoxybenzenes. It is found that the high-frequency dielectric anisotropy is proportional to the anisotropy of the magnetic susceptibility. For axially symmetri…
Epoxies are utilized by the aerospace industry primarily in the form of matrices for composite materials and as adhesives. The increasing use of epoxies requires a knowledge of their lifetimes in extreme service environments. When epoxy adhesives and composites are utilized in primary structural components of airframe…
Abstract Blends may be made of pairs of polymers where neither, one, or both components are crystalline. The state of compatibility for such blends may be deduced by x‐ray and light scattering. A survey of recent studies in this laboratory of several binary blends of crystalline and amorphous polymers is presented.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompatibility of Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)/Poly(styrene-co-4-chlorostyrene) Blends. 1. Differential Scanning Calorimetry and Density StudiesJ. R. Fried, F. E. Karasz, and W. J. MacKnightCite this: Macromolecules 1978, 11, 1, 150–158Publication Date (Print)…
The results of a study of the effect of concentration on the electronic and infrared absorption spectra of LiTCNQ and Li[2H4]TCNQ in dimethylsulphoxide, as well as the Raman and infrared spectra of aqueous solutions of the same salts, are reported. The formation of the self-dimer of the TCNQ radical anion is accompani…
A mutant (gltB) of Escherichia coli lacking glutamate synthase (GOGAT) was unable to utilize a wide variety of compounds as sole nitrogen source (e.g., arginine, proline, gamma-aminobutyrate, and glycine). Among revertants of these Asm- strains selected on one of these compounds (e.g., arginine, proline, or gamma-amin…
The effect of heat treatment in various environments on the electrical and optical properties of indium–tin oxide (ITO) sputtered films has been investigated. As the resistivity is decreased by heat treatment in H2 from 8.3×10−3 to 4.3×10−4 Ω cm, the optical band gap increases from 3.05 to 3.42 eV consistent with a Bu…
Studies were made of oral films formed in vivo, which had been allowed to form on fused silica and Ge-prisms during periods between 2 s and 2 h using a variety of physico-chemical methods. To produce surfaces of different qualities the silica and Ge-prisms had either been detergent-washed, glow discharge treated or co…
A caulysr which is molten at reacdon ramperaauz and dispersed in an inen, porous solid is called an SLP catalyst-a supponwl liq-uid-phase catalyst Design and analysis of catalytic reactions wltb Lncnrpoate many standard methods fmm heterogeneous cadpsis and gaseous reactanzs and produrns and condllcad on SLP Caaiysfs…
The synthesis and diverse conductivity properties of the tetracyanoquinodimethane (TCNQ) complexes of several tetrakis-(alkylthio)-tetrathiafulvalenes are described, and compared with those of tetrathiafulvalene-TCNQ and related complexes.
The crystal phases of nonohmic ZnO ceramics, having Bi 2 O 3 , Sb 2 O 3 , Co 2 O 3 , MnO 2 and Cr 2 O 3 as additives, have been investigated by classifying and clarifying them as a function of the amounts of the additives and sintering temperature, and synthesizing their single phases. These ceramics consist of ZnO ph…
Presents review and critiques, new developments and experimental data and procedures regarding behavior of polymer matrix composite systems when subjected to combined high-temperature/high-humidity environment.
Spectroscopic study by ESCA and e.s.r. techniques was performed for Pt and Pd ions in type Y-zeolites. Pt and Pd ions were found to be ionically bonded to lattice oxygen ions. Atomically dispersed PtO and PdO were shown to give significant X.P.S. positive chemical shifts: +1.3 and +1.4 eV for Pt 4f and Pd 3d lines, re…
Crystals of the complex formed by human Fc fragment and fragment B (FB) of protein A from Staphylococcus aureus were prepared and the crystal structure determined at high resolution by multiple isomorphous replacement. Phase were improved considerably by combining these phases with calculated phases from the Fc compon…
We show how recent theories of two dimensional melting can be carried over to provide natural order parameters for solid, smectic B, and smectic A phases of liquid crystals. Smectic B and other well-ordered smectic phases correspond to systems with bond orientational long range order and positional short range order i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Caprolactam Formation from 6-Aminocaproic Acid, Ester, and AmideFrank Mares and Desmond SheehanCite this: Ind. Eng. Chem. Process Des. Dev. 1978, 17, 1, 9–16Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissue 1…
By the use of convergent-beam and critical-voltage measurements it has become possible to measure the crystal potential to an accuracy of about 10-3. The possibility that the contribution from virtual inelastic scattering is greater than the errors in these experiments is examined and it is shown that only virtual sca…
The effect of hydrogen on the crack propagation behavior and the microstructures around cracks in SUS 304H type and SUS 310 type austenitic stainless steels was examined by means of the tensile tests and microscopic observations. The results obtained are summarized as follows:(1) For austenitic stainless steels, the y…
Il est montré que la signification de la loi généralisée de Bravais est que la vitesse de croissance d'une face est d'autant plus petite que l'énergie d'attachement est plus petite. Les principes de la méthode des PBC sont décrites. Un aperçu est donné du rôle de la sursaturation et de l'adsorption des impuretés dans…
This paper describes the preparation and properties of sterically stabilised polymer latex dispersions in the lower liquid alkanes down to ethane, and in liquid xenon. They exhibit both upper and lower flocculation temperatures which for small latex particles and thick adsorbed layers correlate closely with the bulk p…