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Abstract A new highly phenylated heterocyclic diamine, 3,4‐bis(4‐aminophenyl)‐2,5‐diphenylfuran, was synthesized in three steps from 4–‐nitrodeoxybenzoin. The low temperature solution polycondensation of the diamine with various aromatic diacid chlorides afforded tetraphenylfuran‐containing aromatic polyamides with in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface tension of poly[(3,3,4,4,5,5,6,6,6-nonafluorohexyl)methylsiloxane]Hideki Kobayashi and Michael J. OwenCite this: Macromolecules 1990, 23, 23, 4929–4933Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November…
Abstract Samples of new and weathered utility lumber pressure-treated with chromated copper arsenate (CCA) were tested for leaching of copper, chromium and arsenic by submersion in leaching baths of various pH levels. Accumulation of metals was monitored in leachate at pH 3.5, 4.5, 5.5, 7.0 and 8.5 over a period of 40…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDNA-metal binding by antitumor-active metallocene dichlorides from inductively coupled plasma spectroscopy analysis: titanocene dichloride forms DNA-Cp2Ti or DNA-CpTi adducts depending on pHMark L. McLaughlin, John M. Cronan Jr., Tamara R. Schaller, and Ronald D. SnellingCit…
A technique for measuring stress (positive and negative) with a lateral spatial extent of approximately 2 μm is introduced. The technique, implemented using a Raman microprobe, is demonstrated with measurements of the frequency shift of the sharp, R‐luminescence lines (2Ā and Ē to 4 A 2 radiative transitions) in, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermally stimulated current and dielectric studies of poly(aryl ether ketone ketone)Bryan B. Sauer, Peter Avakian, Howard W. Starkweather Jr., and Ben S. HsiaoCite this: Macromolecules 1990, 23, 24, 5119–5126Publication Date (Print):November 1, 1990Publication History Publi…
Abstract A series of rigid rod amide monomers based on 2,2′‐disubstituted‐4,4′‐diaminobiphenyl were prepared and characterized by DSC and hot stage polarized light microscopy. The monomers were endcapped with maleimide, nadimide, and methylnadimide functionalities. With one exception, all of the materials could be the…
Through close control over green‐state powder processing, pure alumina ceramics of 0.5‐μm grain size were obtained by sintering at 1250°C. The static grain growth of this material was modest at temperatures below 1300°C. However, dynamic grain growth occurred rapidly during superplastic deformation. Therefore, althoug…
Abstract Trotz der enormen praktischen Bedeutung der heterogenen Katalyse blieb die Forschung auf diesem Gebiet lange Zeit stark von der Empirie geprägt. Dank der rapiden Entwicklung oberflächenphysikalischer Methoden lassen sich aber nunmehr die Elementarschritte im atomaren Bereich erfassen und ihre zugrundeliegende…
Abstract The phase morphology of intensively melt mixed and injection moulded bisphenol‐A polycarbonate (PC)/styrene‐acrylonitrile copolymer (SAN) blends changes on annealing above the glass‐transition temperature ( T g ) of both components. For the selected PC and SAN resins, the phase morphology of the 60/40 PC/SAN…
We propose a pathway leading from erythrose-4-phosphate and glutamate to nitrogen 1 and carbons 5,5', and 6 of the pyridoxine ring. This pathway, which parallels the phosphorylated pathway of serine biosynthesis, is predicted on the homology between PdxB and SerA, the structural similarity between serine and 4-hydroxy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray crystal structures of the 1,3,2-benzodithiazolyl dimer and 1,3,2-benzodithiazolium chloride sulfur dioxide solvate: comparison of the molecular and electronic structures of the 10-.pi.-electron C6H4S2N+ cation and the C6H4S2N.bul. radical and dimer and a study of the v…
Polarized neutron diffraction essentially measures discrete spatial 3D Fourier components of the magnetization density inside a single crystal, which is known to obey symmetry requirements. Due to restricted and noisy data sets, the standard analysis, which involves the computation of the inverse Fourier transform of…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Nino Grizzuti, Silvana Cavella, Paolo Cicarelli; Transient and steady‐state rheology of a liquid…
The formation of a vitreous silica surface in the presence of water vapor is investigated through the molecular dynamics simulation technique. Three-body potentials are employed to describe the interatomic interactions. The structure of the reconstructed surface is analyzed with respect to the concentration and type o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkali metal recognition induced isomerization of spiropyransMasahiko Inouye, Masaru Ueno, Teijiro Kitao, and Kikuo TsuchiyaCite this: J. Am. Chem. Soc. 1990, 112, 24, 8977–8979Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published i…
Based on thermodynamic principles a theory for equilibrium interfacial segregation is proposed for perovskite materials, and this theory is applied to BaTiO 3 . An approach developed by Frenkel and refined by Kliewer and Koehler is extended to undoped ternary oxide materials such as BaTiO 3 . The approach uses regular…
Abstract The influence of composition on phase size in immiscible polymer blends is examined both experimentally and theoretically. It was found for eight noncompatibilized blends, of widely varying particle size morphology, that a master curve of phase size versus log‐relative composition could be obtained by shiftin…
A number of Pseudomonas species have been identified which accumulate a polyhydroxyalkanoate containing mainly 3-hydroxydecanoate monomers from sodium gluconate as the sole carbon source. One of these, Pseudomonas sp. strain NCIMB 40135, was further investigated and shown to accumulate such a polyhydroxyalkanoate from…
Experiments simulating carbonate diagenesis have been performed using natural oolitic and skeletal sediments in seawater at temperatures of 183-186 °C and hydrostatic pressures of 6-10 MPa. During the experiments both equant and granular/columnar calcite cements were precipitated. Equant cements developed when both nu…