Materials Literature
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The elastic moduli of polyelectrolyte liquid crystals are calculated within the second virial approximation. A quantitative numerical and analytical theory is set up for rod-like polyelectrolytes in excess salt, whereas qualitative relations are discussed for polyions under more general circumstances. Electrostatic in…
Cubic Li y [V 2 ]O 4 (0.7 ≤ y ≤ 2.0) samples with the [V 2 ] O 4 spinel framework have been prepared by room-temperature chemical delithiation–lithiation of Li[V 2 ]O 4 . The Li + -ion distribution in the interstitial sites is distinguishable in different compositional regions: all-tetrahedral lithium in Li 1−x [V 2 ]…
Abstract Glass transition temperatures ( T g ) were obtained vs. isothermal temperature ( T cure ) and time of cure for a polyamic acid/polyimide system. A time–temperature–transformation (TTT) isothermal cure diagram was constructed to include the time to vitrification and iso‐ T g curves. As for expoxies, the relati…
Summary A modified‐atmosphere packaging system for chilled fresh potato strips, which rapidly produced oxygen levels < 3%, was identified. This system enclosed the strips within 25 μ low density polyethylene film heat sealed to a fibre tray lined with Surlyn‐PVdC‐Surlyn, and the package flushed with an initial atmo…
The influence of prior cold work on the degree of sensitization of AISI 304 stainless steel (SS) has been studied for a wide range of cold work (up to 55%) by using a modified version of the conventional Strauss test as well as by using the more recently developed electrochemical potentiokinetic reactivation technique…
Abstract The 16-8-, 8-5-, 5-2-, 2-1-, 1-0.5-, 0.5-0.3-, 0.3-0.1-, and <0.1- μ m size fractions were centrifuged from a Georgia (U.S.A.) sedimentary kaolin and a hydrothermal kaolin from the Sasso mine (Italy) and analyzed by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), infrared spectroscopy (…
We have studied pressed-pellet samples of potassium-ammonium dihydrogen phosphate [${(\mathrm{KDP})}_{1\ensuremath{-}x}{(\mathrm{ADP})}_{x}$] by Raman scattering for $x=0$, $x=0.5$, and $x=1$ at room temperature and liquid-nitrogen temperature. The liquid-nitrogen-temperature spectra of pure KDP and ADP pellets showed…
Cross-linking occurred rapidly in collagen when it was treated with ascorbate-copper ion systems. Sodium dodecyl sulfate-polyacrylamide gel electrophoretic patterns of CNBr peptides suggest that in some respects the modifications by the ascorbate-copper ion systems mimicked those that occurred in collagen with aging.
Abstract Tobermorite, Ca 5 Si 6 O 16 (OH) 2 ·4H 2 O, is a hydrous calcium silicate that has a layer-type of structure similar to that of the 2:1 clay minerals. In its natural form, tobermorite exhibits little or no exchange for alkali cations; synthetic tobermorites, however, exhibit reversible alkali cation exchange…
The line tension of a dislocation determines its stability against small bow-outs from an equilibrium position. It is composed of a local term which includes a logarithmic singularity (avoided by some cut-off procedure), and a term which represents the interaction with the rest of the configuration. Whereas the prelog…
Partial discharges in voids are traditionally discussed in terms of an equivalent capacitive network, the abc-model [1,2]. A void is represented by a capacitance, and discharges within the void are simulated as a partial or a complete discharge of this capacitance. This simple approach has been so successful with resp…
Affinement des structures de l'adamantane (C 10 H 16 ) et du fluoroadamantane (C 10 H 15 F), dans leur phase plastique, selon un modele de Frenkel ou selon la determination de la probabilite d'orientation moleculaire. Comparaison entre les coefficients A mm l , affines par la seconde methode et les amplitudes libratio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoupling of cyclopropapyrroloindole (CPI) derivatives. The preparation of CC-1065, ent-CC-1065, and analogsRobert C. Kelly, Ilse Gebhard, Nancy Wicnienski, Paul A. Aristoff, Paul D. Johnson, and David G. MartinCite this: J. Am. Chem. Soc. 1987, 109, 22, 6837–6838Publication…
The objective of this study was to characterize the reaction products of fertilizer phosphorus (P) and the phosphate rocks (PRs) that remained unreacted in a Colombian Oxisol (Tropeptic Halplustox) under field conditions cropped with Brachiaria decumbens during the 5 yr after application of triple superphosphate (TSP)…
Transmission electron microscopy has been used to follow how the damage structure as a whole evolves from the earliest stages (1021-2 × 1022 n m−2 (E > 1 MeV)) in neutron-irradiated copper over a range of temperatures from 523 to 623 K. A major feature was the observation of an inhomogeneous structure from the lowest…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer adsorption on rough surfaces. 1. Ideal long chainDaniel Hone, Hong Ji, and P. A. PincusCite this: Macromolecules 1987, 20, 10, 2543–2549Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987https://pubs.…
Abstract Dinuclear iron(II, II) complexes, [Fe2(L-py)(RCOO)2]BF4·nH2O (RCOO : CH3COO (1a) and C6H5COO (2a)), and two types of dinuclear mixed valence iron(II, III) complexes [Fe2(L-py)(RCOO)2](BF4)2·nH2O (RCOO : CH3COO (1b) and C6H5COO (2b)) and [Fe2(L-py)(CH3COO)(OH)](BF4)2·2H2O (3) were prepared, where L-py represen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolycondensation of methyltrimethoxysilaneK. A. SmithCite this: Macromolecules 1987, 20, 10, 2514–2520Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987https://pubs.acs.org/doi/10.1021/ma00176a033https://doi…
Abstract A mathematical model is used to predict the behavior of the support/catalyst/polymer macroparticle during the gas phase polymerization of propylene. The problem is focused on the micrograin level of the macroparticle, and the emphasis placed on the combined reaction and diffusion processes taking place in the…
Previous studies show that stress corrosion crack growth in glass is controlled by chemically enhanced crack tip bond rupture reactions. The brittle nature of fracture in glass suggests that the region where bond rupture reactions occur must be on the order of the atomic spacings in the material. Crack growth kinetics…