Materials Literature
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Recent progress in the development of polymer-based materials for use as electrocatalysts and as amperometric sensors is discussed. Single component and multicomponent polymer based systems are described, and theoretical approaches recently developed to quantify the steady state amperometric current response are discu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrosslinked polymer materials for nonlinear optics. 2. Polyurethanes bearing azobenzene dyesJ. A. F. Boogers, P. T. A. Klaase, J. J. de Vlieger, and A. H. A. TinnemansCite this: Macromolecules 1994, 27, 1, 205–209Publication Date (Print):January 1, 1994Publication History Pu…
Gratings formed by photorefractive and photoisomerization processes in an azo-dye-doped polymer, poly(vinyl carbazole):trinitrofluorenone/Disperse Red I, are investigated by polarization- and field-dependent four-wave mixing experiments. High diffraction efficiencies and long storage times are observed for the photore…
Stable fluorinated vesicles--i.e. vesicles with a hydrophobic and lipophobic fluorinated film within their bilayer membranes--have been obtained from a variety of neutral, zwitterionic or anionic fluorinated amphiphiles, including single chain phosphocholine derivatives, double-chain phospholipids, glycolipids and gly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the glass transition behavior, interaction energies, and hydrogen-bonding strengths of binary poly(p-vinylphenol)/polyether blendsP. Pedrosa, J. A. Pomposo, E. Calahorra, and M. CortazarCite this: Macromolecules 1994, 27, 1, 102–109Publication Date (Print):January 1, 1994…
To describe charge conduction in conducting polymers a dual transmission line with one resistance describing electronic motion in the polymer and a second resistance describing ionic motion in the pores has proved applicable to a number of systems. A further feature of ac impedance plots for these polymers is a high-f…
Actin based motor protein was purified from Chara corallina using high performance liquid chromatography. Sodium dodecyl sulfate gel electrophoresis showed that the molecular weight of the main band was about 230kDa. Although the molecular weight was quite similar to that of the heavy chain of muscle myosin (myosin II…
Abstract
The effects of the addition of interface modifiers on the structure and properties of wood fiber-filled polypropylene (PP) have been studied. Although an increase in the wood fiber loading reduces the overall cost of composites, the mechanical properties of such composites are very poor in the absence of a suitable in…
Hydrotalcites catalyse Baeyer–Villiger oxidation of ketones using a combination oxidant system of molecular oxygen and benzaldehyde to give high yields of lactones and esters at 40 °C.
A comprehensive thermodynamic model of hydrothermal reactions has been developed to predict the optimum conditions for synthesizing perovskite ferroelectric compounds. The model indicates the ranges of reagent concentrations, pH and temperature for which the desired product can be synthesized with the highest possible…
A one-phase system using chloro[tetra(2,6-dichlorophenyl)porphyrinato]manganese(III) catalyst and ammonium acetate cocatalyst epoxidised alkenes by H2O2 with complete conversion in excellent yield and hydroxylated alkanes with yields of 45–87%; for most reactions this system gave better results than a previously descr…
Interfaces between immiscible glassy homopolymers are normally weak as there are few chains which can penetrate far enough into the opposite side of the interface to become entangled there. To overcome this problem a number of strategies for strengthening can be pursued, all of which involve adding a third polymeric c…
A simple, new, systematic method has been developed to evaluate the structural similarity of proteins. Firstly, similar protein fragments of a definable length are detected, combined in pairs and superimposed. The fits are improved until a maximum number of C alpha atoms show a distance below a given threshold value.…
The synthesis of tetra[oligo(ethyleneoxy)]phthalocyanines is described. Preliminary characterization of both thermotropic and lyotropic mesophases obtained from examples of this series are reported.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of poly(styrene-co-acrylate) and poly(vinylcyclohexane-co-acrylate) ionomersJoon Seop Kim, Gaoming Wu, and Adi EisenbergCite this: Macromolecules 1994, 27, 3, 814–824Publication Date (Print):January 1, 1994Publication History Published online1 May 200…
All articles of this category Benzyl esters of 5-unsubstituted pyrrole-2-carboxylic acids were prepared in excellent yields by the base-catalyzed condensation of benzyl isocyanoacetate with α-acetoxynitro compounds, or nitroalkenes,in refluxing tetrahydrofuran. These pyrrolic products are important intermediates in th…
Two new porphyrins bearing several electron-withdrawing β-substituents were obtained in one step, in yields of about 50%, by nitration of meso-tetra(2,6-dichlorophenyl)porphyrin (TDCPPH2) and meso-tetrapentafluorophenylporphyrin (TFPPH2) with HNO3; the iron(III) complex of β-hexanitro-TDCPPH2 was a remarkable catalyst…
The reaction of [NH4]2[MoO2S2], Cul and NEt4Br in the solid state produced [NEt4]4[Cu6Mo2S6O2Br2I4]. Single-crystal X-ray analysis reveals that the cluster anion consists of two nest-shaped fragments interconnected through a Cul2Cu bridge with Cu–I and Cu ⋯ I bond lengths of 2.502 and 2.972 Å respectively. The cluster…
An extremely high tensile strength (σf) of 1340 MPa combined with good bending ductility was obtained as a mixed structure consisting of nanoscale icosahedral (I) particles with a size of about 40 nm surrounded by a thin fcc-Al layer with a thickness of about 2 nm in rapidly solidified Al99−x−yCrxCe1Coy alloys contain…