Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence studies of the conformational changes of poly(methacrylic acid) with pHA. F. Olea and J. K. ThomasCite this: Macromolecules 1989, 22, 3, 1165–1169Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and reactivity of a monomeric pentamethylcyclopentadienyliridium(III) imido complexDavid S. Glueck, Frederick J. Hollander, and Robert G. BergmanCite this: J. Am. Chem. Soc. 1989, 111, 7, 2719–2721Publication Date (Print):March 1, 1989Publication Histor…
The genus Sellaphora Mereschkowsky is resurrected to include those naviculoid diatoms with an H-shaped plastid containing an invaginated pyrenoid; a particular, characteristic series of conformational and positional changes in the plastid and nucleus during the cell cycle; gametangia that produce one gamete apiece and…
A model describing the dependence of the protonation level and the oxidation potential of polyaniline as a function of pH of equilibration and oxidation state has been derived. It is assumed that amine and imine sites do not function independently. Predictions are compared with previous experimental data.
The results of a study of the dielectric properties of a room-temperature ferroelectric liquid crystal in the frequency range from 5 Hz to 13 MHz are presented here. Measurements of complex electric permittivity versus temperature have been taken on aligned samples of different thicknesses with the electric measuring…
The paper presents the major steps of a mathematical procedure that permits the simulation of Electron Channeling Pattern @CP) maps of any mineral species for which unit-cell constants, the atomic species and their equivalent positions are known. The basis of calculation is the Bragg equation, the structure factor d a…
The optical properties of holographic kinoforms are described. It is shown that paraxial designs are not adequate for f/Nos. less than F/10. A nonparaxial design is introduced that retains the high diffraction efficiency of the paraxial designs, yet also produces an unaberrated diffracted wavefront for the design wave…
In order to investigate the factors affecting the interaction of polyurethanes and blood, a series of poly(tetramethylene oxide)-based polyurethane block copolymers was synthesized with systematically varying levels of ion incorporation in the hard segment block. A bimolecular nucleophilic substitution reaction was us…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface organometallic chemistry in the chemical vapor deposition of aluminum films using triisobutylaluminum: .beta.-hydride and .beta.-alkyl elimination reactions of surface alkyl intermediatesBrian E. Bent, Ralph G. Nuzzo, and Lawrence H. DuboisCite this: J. Am. Chem. Soc…
Cu x S thin films with a wide range of sheet resistances (r Square Operator ) and optical transmittance (T%), indicating different composition x, have been obtained from chemical baths constituted from copper(II) chloride, triethanolamine and thiourea at appropriate pH (10-12). Depending on the deposition parameters,…
P(VDF-TrFE) copolymers with approximately 30 mol% of TrFE content exhibit above room temperature a ferroelectric transition of first order type with a large thermal hysteresis. We present recent investigations of the ferroelectric phase and of the phase transition using several techniques: second harmonic generation o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe biosynthesis and characterization of poly(β-hydroxyalkanoates) produced by Pseudomonas oleovoransRichard A. Gross, Christopher DeMello, Robert W. Lenz, Helmut Brandl, and R. Clinton FullerCite this: Macromolecules 1989, 22, 3, 1106–1115Publication Date (Print):March 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompatibilizing effect of block copolymers added to the polymer/polymer interfaceSpiros H. Anastasiadis, Irena Gancarz, and Jeffrey T. KobersteinCite this: Macromolecules 1989, 22, 3, 1449–1453Publication Date (Print):March 1, 1989Publication History Published online1 May 20…
Abstract Most of the industrial plastics used up to now consist of flexible macromolecules in which the repeat units are joined together in a nonlinear fashion by rotating bonds. Stiff‐chain polymers, which in the ideal case have a rodlike shape, have received much less attention. The reason for this is that such poly…
Redox titration results and electronic spectral evidence show that the oxidation state of the “emeraldine” base form of polyaniline can vary depending on whether its synthesis is performed in the presence or absence of air. Chemical doping of leucoemeraldine, the completely reduced form of polyaniline, to selected oxi…
Most solids begin to melt at temperatures well below the bulk transition, by forming surface layers of liquid a few molecules thick. Although it is difficult to detect by direct observation, the phenomenon known as surface melting is believed to play important roles in many technical and natural processes, including t…
Extractos de los artículos publicados en el n.° 398 de "Informes de la Construcción", número especial dedicado a conmemorar el 40 aniversario de la revista.
This work presents the methodological procedure done on the analysis of ancient mortars from two middle-age castles, the one of Camargo (Vlll century) and the Torrejón at Las Henestrosas (XIII century), both in Cantabria. The analysis pretends to get complementary information to the previous one obtained from the arch…