Materials Literature
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Abstract The anionic polymerization of L‐lactide was studied with four potential initiators of different basicity: potassium benzoate, potassium phenoxide, potassium tert ‐butoxide and butyllithium. Regardless of the solvent, only the two most basic initiators proved to be reactive enough to initiate and maintain the…
The DOPA-rich polyphenolic protein secreted by the marine mussel Mytilus edulis establishes key chemical linkages in a water-resistant adhesive. Molecular cloning of the gene for this remarkable protein reveals its primary structure as one of the most repetitive proteins identified in the animal kingdom. Expression an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInternal reforming development for solid oxide fuel cellsAnthony L. Lee, R. F. Zabransky, and W. J. HuberCite this: Ind. Eng. Chem. Res. 1990, 29, 5, 766–773Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://…
Polyimides can undergo reversible electrochemical reduction/oxidation reactions. The electroactive centers have been identified as involving the aromatic‐carbonyl π‐system of the imide functional groups. The aromatic structure and substitution on the imide moiety affects the redox potentials. The reduced (radical‐anio…
When an inline sputtering system is used to make conductive transparent ITO film by the direct current (dc) magnetron sputtering method, it was found that the partial gas pressure of H2O affected the properties of deposited films. When the substrate temperature is at or below 200 °C, the control of H2O partial gas pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThiol surface complexation on growing cadmium sulfide clustersV. Swayambunathan, David Hayes, Klaus H. Schmidt, Y. X. Liao, and Dan MeiselCite this: J. Am. Chem. Soc. 1990, 112, 10, 3831–3837Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethane activation on unsupported platinum clustersD. J. Trevor, D. M. Cox, and A. KaldorCite this: J. Am. Chem. Soc. 1990, 112, 10, 3742–3749Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pubs.acs.org/do…
Thirty-three porphyrins or metalloporphyrins corresponding to the general formula [meso-[N-methyl-4(or 3 or 2)-pyridiniumyl]n(aryl)4-nporphyrin]M (M = H2, CuII, or ClFeIII), with n = 2-4, have been synthesized and characterized by UV-visible and 1H NMR spectroscopy and mass spectrometry. These porphyrins differ not on…
The conjugate reflectivity of colloidal gold has been measured for four samples containing particles with mean sizes of 5, 10, 15, and 30 nm. The response times of the samples indicate a size dependence, but the conjugate signal strength was found to be only weakly dependent on particle size. Calculations of the local…
Three different types of iron oxo‐hydroxo colloids with well‐defined sizes and chemistries have been synthesized by hydrolysis of Fe(III) in acidic and alkaline medium as well as by oxidative hydrolysis of Fe(II), resulting in solutions of β ‐FeOOH (30 nm), a hexanuclear complex (HN; 2 nm), and a polynuclear oxidation…
By reacting CuSatnOH (CuSatnOH = [N-(3-aminopropyl)salicylaldiminatoh]y droxocopper(I1)) with rare-earth hexafluoroacetylacetonates (hfac), complexes of general formula Ln(hfac)$uSatnOH (Ln = Gd, Dy) were obtained. The crystal structure of the dysprosium derivative was determined through X-ray diffraction at room temp…
Abstract Blends of polyethylene (PE) and polyamide (PA) were prepared by a melt mixing process. The dependence of the number average size A n of the dispersed phase on hydrodynamic conditions not only of shear rate but also temperature, inter‐facial tension, viscosity of the blends (WU's treatment), and dispersed phas…
Abstract 1,2-Bis(benzo[b]thiophen-3-yl)ethene derivatives, which possess thermally irreversible and fatigue resistant photochromic properties, were synthesized, cis-1,2-Dicyano-1,2-bis(2-methylbenzo[b]thiophen-3-yl)ethene 1a and 2,3-bis(2-methylbenzo[b]thiophen-3-yl)maleic anhydride 2a underwent reversible photocycliz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAsymmetric hydroxylation, epoxidation, and sulfoxidation catalyzed by vaulted binaphthyl metalloporphyrinsJohn T. Groves and Peter ViskiCite this: J. Org. Chem. 1990, 55, 11, 3628–3634Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published…
The specular reflectivity of neutrons has been used to characterize quantitatively the microphase separated morphology of symmetric, diblock copolymers of polystyrene (PS), and polymethylmethacrylate (PMMA), as a function of the total molecular weight of the copolymer where either block is perdeuterated. It is shown t…
Effects of various substituents including chromophores on the second harmonic generation (SHG) of Cyanovinylheteroaromatics were examined. The molecular polarizability was calculated by the PPP MO method to correlate SHG responsiveness with chemical structures. 3-[(2-cyano-2-ethoxycarbonyl)ethenyl]indole 8b exhibited…
The vibronic absorption bands with zero-phonon lines at 1·40, 1·883, and 2·51 eV, the broad absorption band with a maximum near 1·4eV and the series of absorption lines near 3·1 eV, the vibronic luminescence bands with zero-phonon lines at 1·40eV and 2·56 eV, all associated with nickel-related optical centres in synth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural transformation of non-oxide chalcogenide glasses. The short-range order of lithium sulfide (Li2S)-phosphorus pentasulfide (P2S5) glasses studied by quantitative phosphorus-31, lithium-6, and lithium-7 high-resolution solid-state NMRHellmut Eckert, Zhengming Zhang,…
We review the development of a strain rate and temperature dependent plasticity model for finite deformation. In particular we address both the method of determining the parameters of the model and the engineering meaning of the parameters in terms of uniaxial stress-strain curves. The ability of the model to predict…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen quenching of electronically excited hexanuclear molybdenum and tungsten halide clustersJulie A. Jackson, Claudia. Turro, Mark D. Newsham, and Daniel G. NoceraCite this: J. Phys. Chem. 1990, 94, 11, 4500–4507Publication Date (Print):May 1, 1990Publication History Publi…