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Abstract Dynamic or quasi‐elastic light scattering (LS) from polymers in solution arises from concentration fluctuations. With the aid of modern photomultipliers these can be followed as a function of time. A proper evaluation allows to study the center of mass motion and the dynamics of individual chains. The relevan…
The Gram-Charlier temperature factor formalism has been applied to a set of accurate low-temperature data on bis(pyridine)(meso-tetraphenylporphinato)iron(II), and to a theoretical set of static structure factors on the hexaaquairon(II) ion. The refinements are compared with the multipole treatment for atomic aspheric…
Glasses have been formed in the binary system PbO–Ga 2 O 3 within the compositional range extending from 60 to 80 mol% PbO. These glasses exhibit infrared cutoff values near 7.75 μm. The glasses are orange‐red as a result of a cutoff in visible transmission near 500 nm. The glass transformation temperature decreases w…
Anion polarizations have been introduced in a molecular dynamics simulation of a complexing ionic liquid MAX4 similar to tetrachloroaluminates. The influence of the polarizability on the structure of the melt has been deduced from the radial distribution functions, the numbers of nearest and next nearest neighbor pair…
α‐Al 2 O 3 ‐seeded, boehmite‐derived γ‐Al 2 O 3 was transformed in the presence of V 2 O 5 , resulting in a 205°C decrease in the α‐Al 2 O 3 transformation temperature and a 74% reduction in the apparent activation energy for the γ‐ to α‐Al 2 O 3 transformation at temperatures greater than 850°C. These changes are att…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal and cooperative Jahn-Teller distortions of nickel(2+) and copper (2+) in tetrahedral coordinationDirk Reinen, M. Atanasov, G. Nikolov, and Friedhelm SteffensCite this: Inorg. Chem. 1988, 27, 10, 1678–1686Publication Date (Print):May 1, 1988Publication History Published…
Abstract 12-Heteropoly acids exhibited high performance for selective oxidation of cyclopentene to glutaraldehyde with hydrogen peroxide. Especially, heteropoly acids with mixed addenda atoms of Mo and W, H3PMo12−xWxO40(x=1–9), showed excellent results.
The potentiodynamic behavior of polycrystalline nickel disk electrodes in the potential range of the active to passive transition was investigated in still and stirred sulfuric acid solutions containing potassium sulfate in the 0.4 ⩽ p H ⩽ 5.7 range. Voltammetric data derived with a nickel rotating disk electrode allo…
Oxycarbide glasses in the Mg‐Al‐Si‐O‐C system were produced at initial carbon levels of 0.0, 0.5, 1.0, 1.5, 2.0, and 2.5 wt%. Carbon was incorporated into the glass melts by means of SiC additions. The glasses were melted between 1750° and 1800°C under nitrogen atmospheres. The limit of carbon incorporation was reache…
Electrochemical doping‐undoping kinetics of electropolymerized polypyrrole (PPy) and the charge‐discharge characteristics of battery were found to show an interesting dependency on the kind of anions used for the preparation of PPy film. The relationship between the doping charge (anodization charge estimated from cyc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic mechanical studies on the crystal dispersion using ultradrawn polyethylene filmsMasaru Matsuo, Chie Sawatari, and Tomoko OhhataCite this: Macromolecules 1988, 21, 5, 1317–1324Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published…
The glucose permease (IIGlc/IIIGlc complex) of the bacterial phosphotransferase system mediates sugar transport across the cytoplasmic membrane concomitant with sugar phosphorylation. It contains 3 cysteine residues, of which Cys-204 and Cys-326 are localized in the hydrophobic part and Cys-421 in the hydrophilic part…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of metalloporphyrins and viologens at zeolite Y-modified electrodes: evidence for electron trapping by monomolecular porphyrin layersZhuyin Li, Chong Mou Wang, Lalchan Persaud, and Thomas E. MalloukCite this: J. Phys. Chem. 1988, 92, 9, 2592–2597Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock copolymers at interfaces. 1. Micelle formationMark R. Munch and Alice P. GastCite this: Macromolecules 1988, 21, 5, 1360–1366Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://pubs.acs.org/doi/10.1021/m…
We have studied the reactions occurring for the deposition of chromium onto pyromellitic dianhydride-4,4′-oxydianiline (PMDA-ODA) polyimide for a wide range of metal coverages, using x-ray photoelectron spectroscopy as well as solution studies of model compounds. A multistep, coverage-dependent mechanism is proposed w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLattice models for bulk polymers at interfacesDoros N. TheodorouCite this: Macromolecules 1988, 21, 5, 1391–1400Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://pubs.acs.org/doi/10.1021/ma00183a035https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and thermodynamics of bulk homopolymer solid interfaces: a site lattice model approachDoros N. TheodorouCite this: Macromolecules 1988, 21, 5, 1400–1410Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel triple-cubane type organometallic oxide clusters: [MCp*MoO4]4.nH2O (M = Rh and Ir; Cp* = C5Me5; n = 2 for Rh and 0 for Ir)Yoshihito. Hayashi, Koshiro. Toriumi, and Kiyoshi. IsobeCite this: J. Am. Chem. Soc. 1988, 110, 11, 3666–3668Publication Date (Print):May 1, 1988Pu…
Abstract A new method for the synthesis of compact, multifunctional star‐shaped polystyrenes was designed. A plurifunctional metalorganic initiator is obtained upon reaction of potassium naphthalene with commercial divinylbenzene. The resulting polymeric “core” exhibits a number of metalorganic sites. In a subsequent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a series of polyimides derived from 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]bis[1,3-isobenzofurandione]G. Ronald Husk, Patrick E. Cassidy, and Karen L. GebertCite this: Macromolecules 1988, 21, 5, 1234–1238Publication Date (Print…