Iron trichloride-phosphine adducts with tetrahedral geometry and their reaction with ethanol. Structure and magnetic properties of [PH(tert-Bu)3]2[Fe2(.mu.-OEt)2Cl6]
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A novel, facile technique for deacetylating chitin
Abstract The use of water‐miscible organic solvents such as 2‐propanol, 2‐methyl‐2‐propanol and acetone in the alkaline deacetylation of chitin was examined. Using such diluents enables adequate deacetylation to be obtained with much smaller volumes of alkali, typically 1,5 cm 3 50 wt.‐% aq. NaOH per 1 g of chitin, al…
INTERACTIONS OF ORGANIC SOLVENTS WITH POLYURETHANE
Polyurethane elastomers [1] are linear block copolymers of the type in which one of the two blocks is typically a polyether or a polyester diol with a molar mass between 300 to 6000. These blocks comprise the soft segments because at the service temperature they exist in a rubbery or a viscous state and impart elastom…
The molecular structure of low-density polyethylene. 1. Long-chain branching and solution properties
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe molecular structure of low-density polyethylene. 1. Long-chain branching and solution propertiesE. Nordmeier, U. Lanver, and M. D. LechnerCite this: Macromolecules 1990, 23, 4, 1072–1076Publication Date (Print):February 1, 1990Publication History Published online1 May 20…
Semiconductor photophysics. 5. Charge carrier trapping in ultrasmall silver iodide particles and kinetics of formation of silver atom clusters
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor photophysics. 5. Charge carrier trapping in ultrasmall silver iodide particles and kinetics of formation of silver atom clustersO. I. Micic, M. Meglic, D. Lawless, D. K. Sharma, and N. SerponeCite this: Langmuir 1990, 6, 2, 487–492Publication Date (Print):Febru…
Variation of displacement parameters in structure refinements of low albite
New X-ray diffraction measurements of a well-ordered Roc Tourn6 low albite (space group Cl) were refined in a variety of models. In addition, structural data for other low albites obtained from room-temperature X-ray and neutron diffraction refinements were retrieved from the literature. Comparison of refined structur…
Oxidative polymerization of diphenyl disulfides with quinones: formation of ultrapure poly(p-phenylene sulfide)s
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidative polymerization of diphenyl disulfides with quinones: formation of ultrapure poly(p-phenylene sulfide)sEishun Tsuchida, Kimihisa Yamamoto, Mitsutoshi Jikei, and Hiroyuki NishideCite this: Macromolecules 1990, 23, 4, 930–934Publication Date (Print):February 1, 1990Pu…
Preparation of Silicon Carbide/Aluminum Nitride Ceramics Using Organometallic Precursors
Solid solutions of 2H ‐SiC/AlN can be prepared at temperatures less than 1600°C by rapid pyrolysis (“hot drop”) of mixtures of [(Me 3 Si) 0.80 ((CH 2 =CH)MeSi) 1.0 (MeHSi) 0.35 ] n (VPS) or [MeHSiCH 2 ] n (MPCS) with [R 2 AlNH 2 ] 3 , where R=Et, i ‐Bu or simply by slow pyrolysis of the precursor mixture in the case o…
Low-frequency relaxation modes and structural disorder inKTa1−xNbxO3
A light-scattering study of the low-frequency excitations in single crystals of cubic and tetragonal ${\mathrm{KTa}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Nb}}_{\mathrm{x}}$${\mathrm{O}}_{3}$ (x=0.26 and 0.28) has been carried out by employing a technique which uses an Iodine filter to remove elastically scat…
Shape Selective Epoxidation of Alkenes Catalyzed by Titanosilicate
Abstract Epoxidation of 1- and 2-hexenes with H2O2 was catalyzed by titanosilicate whereas cyclohexene failed to be oxidized by this catalyst system. This shape selectivity was ascribed to the molecular sieving action of titanosilicate. The rates for epoxidation of linear alkenes decreased with increasing the chain le…
Effect of flexoelectric coupling on helix distortions in cholesteric liquid crystals
The static and dynamic properties of the flexoelectric effect in cholesteric liquid crystals are presented. The application of an external electric field, below the critical strength for helix unwinding, perpendicular to the cholesteric helix, results in a linear electro-optic effect. The experimental results are in g…
Development of the SESAME Metallic Fuel Performance Code
A simple fuel performance code, SESAME, has been developed to analyze the steady-state irradiation behavior of metallic fuels. Important characteristics of metallic fuels such as fission product gas release, swelling, material redistribution, bonding sodium infiltration, and axial elongation are studied. Simple models…
Voltammetric behavior of perborate on prussian‐blue‐modified carbon paste electrodes
Abstract The voltammetric behavior of the catalytic reduction of perborate at carbon paste electrodes modified with Prussian blue is compared with that of hydrogen peroxide. Good linearity is observed between the voltammetric current and the concentration from 1 to 100 ppm H 2 O 2 as perborate. The influence of the pa…
Polarization mechanisms of morphotropic phase boundary lead barium niobate (PBN) compositions
Investigations of the polarization mechanisms in tungsten bronze relaxor ferroelectrics, Pb1–xBaxNb2O6 (PBN[(1−x) %]), in particular, of the morphotropic phase boundary compositions have been carried out for both ceramics and bulk crystals by means of electrical, thermal, optical, and electron-microscopic methods. Rel…
Synthesis and electrochemistry of pterins coordinated to tetraammineruthenium(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and electrochemistry of pterins coordinated to tetraammineruthenium(II)Angel Abelleira, Roy D. Galang, and Michael J. ClarkeCite this: Inorg. Chem. 1990, 29, 4, 633–639Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published…
The Effect of Dissolved CO2 and O2 on the Corrosion of Iron
Reports concerning the effects of dissolved carbon dioxide on the corrosion of iron have ranged from “no effect” to a catalytic mechanism for the observed corrosion processes. Pedagogical references indicate that dissolved carbon dioxide is benign towards iron corrosion. Contrary to this, our results suggest that carb…
Equation of state for persistent-flexible liquid-crystal polymers. Comparison with poly(γ-benzyl-L-glutamate) in dimethylformamide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquation of state for persistent-flexible liquid-crystal polymers. Comparison with poly(γ-benzyl-L-glutamate) in dimethylformamideReinhard HentschkeCite this: Macromolecules 1990, 23, 4, 1192–1196Publication Date (Print):February 1, 1990Publication History Published online1…
Carbon-13 NMR study of radiation-induced crosslinking of linear polyethylene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR study of radiation-induced crosslinking of linear polyethyleneFumitaka Horii, Qingren Zhu, Ryozo Kitamaru, and Hitoshi YamaokaCite this: Macromolecules 1990, 23, 4, 977–981Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Pu…
The bistability of the surface-stabilized ferroelectric liquid-crystal effect in electrically reoriented chevron structures
Low-frequency electric field treatment irreversibly changes the chevron structure of a surface-stabilized ferroelectric liquid-crystal sample: the angle between the smectic layers and the surface normal decreases. As a result different textures appear, and a pronounced effect on the switching behavior is observed. The…
Morphological, Chemical, and Isotopic Evidence for an Early Diagenetic Evolution of Detrital Smectite in Marine Sediments
Abstract Mineralogical (XRD), morphological (transmission electron microscopy), chemical (major, rare-earth elements, and scanning-transmission electron microscopy), and isotope (Sr, O, H) measurements were made of marine detrital smectite from shales to study their reactions during early diagenesis. Albian, Aptian, a…