Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal isomerization behaviors of a spiropyran in bilayers immobilized with a linear polymer and a smectitic clayTakahiro Seki and Kunihiro IchimuraCite this: Macromolecules 1990, 23, 1, 31–35Publication Date (Print):January 1, 1990Publication History Published online1 May…
Abstract Extrusion measurements have been carried out on blends of nylon 6 and a liquid‐crystalline copolyesteramide (LCP). The flow curves at low temperature show a behavior similar to that of pure LCP with a rapid rise of the viscosity at low shear rates. At high shear rates the viscosity is lower than that for each…
The structure of adsorbed polymer layers has been studied extensively, both experimentally and theoretically, in a diverse range of systems. Although the form of the volume-fraction profile of polymer segments, normal to the interface has been predicted in detail from theory, few experimental methods can probe more th…
G. Reid and M. Schröder, Chem. Soc. Rev., 1990, 19, 239 DOI: 10.1039/CS9901900239
Abstract Perovskite-type oxides showed the catalytic activity for NO decomposition above 773 K, which depended largely on constituent metal cations and their composition. Results obtained indicate that perovskite-type oxides such as La0.8Sr0.2CoO3 are a promising NO decomposition catalyst having high activity and ther…
The microstructure and dielectric properties of lead magnesium niobate (PMN) ceramics containing the determental second phase, pyrochlore, have been studied. The pyrochlore phase within PMN was found to be present as isolated grains in the microstructure with a composition of Pb 2 (Mg 0.25 Nb 1.75 )O 6.625 and a prefe…
Complexes in which the Eu3+, Tb3+, and Gd3+ ions are encapsulated in the p-t-butylcalix[4]arene-tetra-acetamide ligand, (1) have been synthesized and their photophysical properties investigated; the Tb3+ complex exhibits a high luminescence quantum yield (0.2) and a long luminescence lifetime (1.5 ms) upon ligand exci…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPath-dependent morphologies of a diblock copolymer of polystyrene/hydrogenated polybutadieneRobert E. Cohen, P. L. Cheng, K. Douzinas, P. Kofinas, and C. V. BerneyCite this: Macromolecules 1990, 23, 1, 324–327Publication Date (Print):January 1, 1990Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrigonal-planar [M(SR)3]1- complexes of cadmium and mercury. Structural similarities between mercury-cysteine and cadmium-cysteine coordination centersEric S. Gruff and Stephen A. KochCite this: J. Am. Chem. Soc. 1990, 112, 3, 1245–1247Publication Date (Print):January 1, 199…
The use of specular reflection of X-rays to study the structure of the liquid/vapour interfaces along the direction normal to the surface is described. If RF(θ) is the theoretical Fresnel reflection law for X-rays incident on an ideal flat surface at an angle θ, and R(θ) is the measured reflectivity from the true surf…
The structure of thymidylate synthase (TS) from Escherichia coli was solved from cubic crystals with a = 133 A grown under reducing conditions at pH 7.0, and refined to R = 22% at 2.1 A resolution. The structure is compared with that from Lactobacillus casei solved to R = 21% at 2.3 A resolution. The structures are co…
Inductive-write and magnetoresistive (MR)-read dual-element heads of very narrow trackwidths and narrow gaps have been designed, fabricated, and recording-tested on thin-film media of high coercivity and squareness. Results show excellent writability at modest write currents of 50 mA, large readback amplitudes with go…
Gadopentetate dimeglumine is an intravenous contrast medium used in magnetic resonance imaging. To determine its safety, the authors summarized data concerning adverse reactions, laboratory parameters, and other assessments for 1,068 adult patients who received gadopentetate dimeglumine in United States clinical trial…
A new search strategy is presented to obtain initial phases for single-crystal diffraction data by molecular replacement. It consists of carrying out 'Patterson refinements' of a large number of the highest peaks of a rotation function. The target function for Patterson refinement is proportional to the negative corre…
In order to examine the Srolovitz’s theory of attractive interaction between dislocations and dispersed particles, an Al-3.1 at% Mg-1.3 vol% Be alloy having a combined effect of dispersion- and solution-hardenings was subjected to creep tests and transmission electron microscopic observation. The creep test was conduc…
Abstract Molecular interactions such as especially hydrogen bondings are considered to play a key role in polymer compatibility. In this study binary blends produced by extrusion of a MDI based segmented polyesterurethane (TPU) together with styrene‐acrylonitrile and acrylonitrile‐butadiene‐styrene copolymers, respect…
Abstract The equilibrium swelling behavior of heterogeneous systems consisting of a consisting of a continuous network phase and a dispersed lamellar, spherical, or cylindrical phase is described using a thermodynamic model. The case of swelling of both phases but to different extents is described. The equilibrium vol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the residence lifetimes of water molecules in the inner coordination sphere of paramagnetic metalloporphyrins and their adducts with poly(α-amino acids)Kenneth E. Kellar, Suree M. Spaltro, and Natalie FosterCite this: Macromolecules 1990, 23, 2, 428–431Publi…
The key physical design parameter for flexible buried non-pressure pipe is Pipe Stiffness. The ever broadening recognition of the inherent chemical resistance of polyvinyl chloride (PVC) pipe has led to a wide range of possible new applications. The effect of environment on PVC and other plastic pipe is typically meas…
The focal conditions for diffraction grating systems that employ holographic and varied line-space gratings are shown to be formally identical. An example is given in which the recording geometry of a holographic grating is derived that provides the same imaging (to lowest order) as a ruled grating whose grooves, whil…