Materials Literature
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The lyomesomorphic behaviour in apolar organic solvents of members of two series 1 and 2 of disc-shaped palladium organyls—the syntheses of four of them are new (1d, f and 2a, e) and are described here—each carrying twelve long lipophilic chains have been studied. Their lyomesomorphism appeared to be complex and has b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpatial Organization of Polymer Chains in a Crystallizable Diblock Copolymer of Polyethylene and PolystyreneR. E. Cohen, A. Bellare, and M. A. DrzewinskiCite this: Macromolecules 1994, 27, 8, 2321–2323Publication Date (Print):April 1, 1994Publication History Published online…
The enhancement of interfacial adhesion between immiscible amorphous polyamide and polystyrene (PS) by the addition of thin layers of styrene-maleic anhydride (SMA) random copolymer, used as a reactive compatibilizer, has been investigated. The asymmetric fracture test was employed to measure the fracture toughness of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel Compounds for the Oxidized Uteroferrin-Phosphate Complex with Novel Dinucleating Ligands Containing Phenolate and Pyridine DonorsB. Krebs, K. Schepers, B. Bremer, G. Henkel, E. Althaus, W. Mueller-Warmuth, K. Griesar, and W. HaaseCite this: Inorg. Chem. 1994, 33, 9, 19…
Summary Tungsten and gold particles, coated with plasmid DNA harboring the β-glucuronidase (GUS) and neomycin phosphotransferase II (npt-II) genes, were delivered into tobacco primary leaves and suspension-cultured cells of maize using the helium particle inflow gun. Cell viability and particle localization were deter…
Abstract AerMet 100 alloy possesses a combination of high strength, hardness, toughness and good resistance to stress-corrosion from chlorides. It can be used for many aerospace applications such as landing gear and fasteners. This datasheet provides information on composition, physical properties, hardness, elasticit…
Abstract A novel π-donor, 1,2:5,6-bis(ethylenedithio)pyracylene (2), was prepared by dithioacetalization of 1,5-pyracenedione with 1,2-ethanedithiol followed by ring expansion on treatment with tellurium tetrachloride. 2 showed two reversible low oxidation potentials by cyclic voltammetry. Single crystal X-ray analysi…
The replacement of lime with limestone for the neutralisation of acid water was investigated through batch and semi-continuous studies. A fluidised-bed reactor with multiple stages of increasing diameters is preferred for the limestone neutralisation process as it allows fluidisation of the bigger particles but also p…
Introduction The application of organic coatings is the most extensive way of protecting metal products from corrosion. Developments of organic coatings and their applications are subject to the effects of many factors at present. The most important among these factors are ecological requirements aimed at the protecti…
The spectral band profiles of the Ē→4A2g and 2Ā→4A2g transitions of Cr3+ in Al2O3, i.e., the commonly known ruby 6943 Å (R1) and 6929 Å (R2) emission lines, in the temperature range 10–300 K were recorded and deconvoluted numerically with excellent accuracy into a Lorentzian (homogeneous) component and a Gaussian co…
The review deals predominantly with a description of martensitic phase transitions on the basis of Landau theory, using the strain of a crystal as the order parameter and the expansion of energy in powers of the strain and its gradients. The important role of compatibility equations for strain tensor components in min…
Hydrogen (H) ingress into two copper (Cu)-nickel (Ni) alloys — a commercial 77% Cu-15% Ni alloy (aged) and alloy K-500 (UNS N05500, aged and unaged) — was studied using a technique referred to as hydrogen ingress analysis by potentiostatic pulsing (HIAPP). Anodic current transients obtained for these alloys in an acet…
Pure Ta has been cold rolled and annealed at various temperatures. The crystallographic textures were studied by measuring X-ray pole figures and subsequently calculating the orientation distribution function. The microstructure was investigated via optical microscopy. The rolling textures were explained by dislocatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron(II)-.alpha.-Amino Acid Complexes from Nonprotic Solutions: Reactions of [Fe(Mes)2(phen)] with .alpha.-Amino Acids and the Structures of Bis(L-Prolinato)(1,10-phenanthroline)iron(II) and Bis(D-prolinato)(1,10-phenanthroline)iron(II)C. Philippe Magill, Carlo Floriani, Ang…
Abstract A number of different approaches were used to enhance the toughness of tri‐ and tetrafunctional epoxies and of unsaturated polyester resins. In the case of epoxies, tough, thermally stable, engineering thermoplastics, namely a bisphenol‐A polycarbonate and a thermoplastic poly(ether imide) (Ultem 1000) were e…
NaNiO2 exhibits a layered structure made of NiO2 slabs between which Na+ ions are inserted in octahedral environment. Trivalent nickel ions in the low spin state (t2 6e1) exhibits a Jahn-Teller effect which leads to a distortion of the NiO6 octahedra and hence to a macroscopic lattice distortion. The partial substitut…
Air-jet texturing is a versatile process for producing a range of synthetic yarns with a spun-like appearance, which are widely used for apparel and furnishing fabrics and industrial textiles. There is no universal nozzle capable of processing any supply yam of any linear density. The role played by nozzle geometry is…
Abstract The fracture mode of poly(vinyl chloride)/methyl methacrylate/butadiene/styrene (PVC/MBS) polymer blends can change from ductile to brittle in accordance with the changes in shape of the test specimen or test conditions. Therefore, the mechanisms of impact energy absorption and the main cause of stress whiten…
The coatings used on telescope mirrors and other optical interfaces can have a marked effect on an optical system's image quality. We describe the wave-front aberrations, particularly the defocus and on-axis astigmatism, that are induced by the s- and p-phase shifts of coatings. These coating-induced wave-front aberra…
The structural parameters of friction spun yams are investigated using an image processing system. Attempts are made to use data obtained from this analysis to explain differences in yam strength. In particular, the influence of production speed on yarn tenacity is paralleled by changes in the observed migrational cha…