Materials Literature
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Abstract The reactions occurring during melt‐mixing of poly(ethylene terephthalate) and bisphenol‐A polycarbonate have been reconsidered. Certain evidence leads us to conclude that two reactions, usually disregarded in the literature, occur, which have to be considered in the general scheme along with the already desc…
Diffusion experiments using polystyrene (PS) molecules of three different topologies, linear, ring, and microgel, were performed. Tracer diffusion of linear PS in ring matrices was found to be nearly identical to that in linear matrices, a surprising result in view of current theories for matrix-dependent tracer diffu…
Adsorption and electron stimulated processes of NH3 on rutile TiO2(110) have been studied by means of x-ray photoemission spectroscopy (XPS) and low-energy ion scattering (LEIS). Defects, mostly surface oxygen vacancies, can be produced easily on TiO2 surfaces by thermal treatment or by rare gas ion sputtering. We hav…
Tyrosine phosphorylation of 42-kDa mitogen-activated protein kinase (p42mapk) occurs during expression of the recombinant protein in Escherichia coli, as well as during in vitro phosphorylation of the protein purified from this source. Structural analyses were performed to identify the site(s) of tyrosine phosphorylat…
Four methods for partial discharge (PD) detection in gas-insulated substations were considered. Laboratory tests were carried out to determine the efficiency of these methods to detect defects and to discriminate among different defect types. The sensitivity of the methods is compared and the applicability of the meth…
We report on experiments to determine the feasibility of using refractory transition metal carbides as stable field emission cathodes. Applications of such cathodes could include radiation immune microcircuitry, radio frequency (rf) vacuum microelectronic amplifiers, flat panel displays, e-beam lithography, and other…
It has been argued that, in systems that have disorder too large to be described by a Gaussian, x-ray-absorption fine-structure (XAFS) spectroscopy alone cannot define the radial distribution function (RDF) because of the lack of low-k data. We show that the low-k data can, under certain conditions, be reconstructed u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZero field splitting and exchange interactions in bis(cyclopentadienyl)titanium(III) dinuclear compounds with short metal-metal distances: synthesis, x-ray structure, and EPR spectroscopy of methoxo- and ethoxo-bridged dimersEdmond Samuel, John Frank Harrod, Didier Gourier,…
The biocompatibility of radiofrequency plasma polymerized films (less than 100 nm thick) deposited on biomedical polymer supports has been characterized by in vitro and in vivo methods. The polymer interface materials covered a wide range of elemental composition and surface properties, and were prepared from N-vinyl-…
ABSTRACT The average size and shape of a polymer coil confined in a slit between two parallel plates depends on the distance L between the plates. On the basis of numerical results, four different regimes can be distingubhed. For large values of L the coil is essentially unconfined. For intermediate values the coil or…
An iterative correction process, recently incorporated into the National Research Council of Canada Fourier-transform thin-film synthesis program, is applied to the design of wideband antireflection coatings. This type of problem is different from those solved in the past by this method. It cannot be handled in a prac…
A Longoni-Chini cluster, [Ptl5(C0),l2-, was prepared on MgO powder by a surfacemediated synthesis from Na2PtCb\nin the presence of CO. The formation of [Pt15(CO)30]2a-n d its decarbonylation at 120 'C under vacuum were characterized\nby infrared and X-ray absorption spectroscopies. The decarbonylated cluster had an av…
Boron doped zinc oxide films were deposited by atmospheric pressure chemical vapor deposition in a laminar flow reactor from diethyl zinc, tert‐butanol, and diborane in the temperature range from 300 to 420°C. When the deposition temperature was above 320°C, both doped and undoped films have highly oriented crystallit…
A recently proposed microplane model, which describes not only cracking but also general nonlinear triaxial response, is extended to cyclic loading and the rate effect, and is implemented in a three‐dimensional finite element code. The material properties are characterized separately on planes of various orientations…
Contrasting the flow response of aqueous dispersions of colloidally stable polymer particles with dispersions controlled only by hydrodynamic interactions, we find that the hydrodynamic interactions are still a major factor, but colloid chemical forces can modify the response in important ways. For example, at solids…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonequilibrium liquid-liquid phase separation in crystallizable polymer solutionsHwan K. Lee, Allan S. Myerson, and Kalle LevonCite this: Macromolecules 1992, 25, 15, 4002–4010Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAspects of the solution chemistry of trans-diammineplatinum(II) complexesTrevor G. Appleton, Alicia J. Bailey, Kevin J. Barnham, and John R. HallCite this: Inorg. Chem. 1992, 31, 14, 3077–3082Publication Date (Print):July 1, 1992Publication History Published online1 May 2002…
A characterization of rubbed polystyrene (PS) film in terms of the optical retardation measurement as a function of the rubbing strength (RS) has been made, and the alignment capability of the rubbed PS films for a nematic liquid crystal (5CB) has been investigated by measuring anchoring strength and its temperature d…
A density-modification procedure for phase extension and refinement is described which replaces all density less than one-fifth of the height of a light-atom peak by zero. Its effectiveness is demonstrated by applications to a small and a medium-size protein structure. With high-resolution data, for the small protein,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of cyclic liquid crystalline oligomers based on 1-(4-hydroxy-4'-biphenylyl)-2-(4-hydroxyphenyl)butane and 1,10-dibromodecaneV. Percec, M. Kawasumi, P. L. Rinaldi, and V. E. LitmanCite this: Macromolecules 1992, 25, 15, 3851–3861Publication Date…