Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDendritic Catalysts: Reactivity and Mechanism of the Dendritic Bis(oxazoline)metal Complex Catalyzed Diels−Alder Reaction†Chi Ching Mak and Hak-Fun ChowView Author Information Department of Chemistry, University Science Centre, Chin…
Abstract A critical overview of different synthetic approaches to poly( p ‐xylylene)s (PPXs) is coupled with perspectives on particular structure–property relationships and challenging applications. An attempt is made to emphasize the potential of different synthetic approaches to PPXs focused on different application…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTTunable Redox and Optical Properties Using Transition Metal-Complexed PolythiophenesJerry L. Reddinger and John R. ReynoldsView Author Information Center for Macromolecular Science and Engineering, Department of Chemistry, Universit…
One-dimensional Fibonacci-class quasilattices are proposed and studied, which are constructed by the substitution rules B\ensuremath{\rightarrow}${\mathrm{B}}^{\mathrm{n}\mathrm{\ensuremath{-}}1}$ A, A\ensuremath{\rightarrow}${\mathrm{B}}^{\mathrm{n}\mathrm{\ensuremath{-}}1}$ AB. We have proved that this class of bina…
An approach to material strain tolerance, which basically makes it possible to lower the elastic modulus while retaining strength, was experimentally confirmed using as an example a porous silicon nitride composed of oriented anisotropic grains and pores. The porous structure consisting of tightly tangled rodlike grai…
Cadmium sulfide nanoparticles have been synthesized using mercaptoethanol as a capping agent. A refined analysis of the powder X-ray diffraction by Debye function analysis shows that the as synthesized material consists of both ∼50 wt % hexagonal wurtzite-type nanoparticles of about 2 nm and larger cubic sphalerite-ty…
Charge injection and generation in nematic liquid crystal (NLC) cells have been studied by measuring the steady state currents and capacitances of NLC cells. The steady state current is attributable to the charge injection from the electrode at the lower applied dc voltages, while the steady state current is due to th…
The goal of this investigation was to optimize the synthesis of silazane-based polymers for processing fibre-reinforced ceramic matrix composites (CMCs). Liquid oligomeric silazanes were synthesized by ammonolysis of chlorosilanes and characterized spectroscopi- cally (FTIR, NMR) as well as by elemental analysis. The…
In order to develop “stealth” injectable PEG-coated poly(alkyl cyanoacrylate) (PACA) nanoparticles, a novel poly(MePEG cyanoacrylate- co -alkyl cyanoacrylate) copolymer has been synthetized in a simple way by condensing MePEG cyanoacetate esters with formaldehyde in the presence of dimethylamine. This approach allowed…
Abstract Morphology and oxygen barrier properties of LDPE/EVOH blends have been studied. Laminar dispersion of ethylene‐vinyl alcohol copolymer (EVOH) with high oxygen barrier properties was obtained in the matrix of low density polyethylene (LDPE) when extruded through an annular blown film die. Various laminar morph…
The singlet excited state behavior of tetrakis(4- N -methylpyridyl)porphine (T4MPyP) in the presence of the four mononucleotides of DNA in aqueous solution has been examined. Addition of the nucleotides of adenine, thymine, or cytosine to a solution containing T4MPyP results in an increase in the fluorescence intensit…
The ferroelectric domain structure and its evolution with external stress in free-standing polycrystalline ${\mathrm{PbTiO}}_{3}$ very thin films (VTF's) (thickness t200 nm) and thicker films (t>200 nm), have been studied by in situ transmission electron microscopy. It is found that the domain structure of a VTF an…
We describe the design, fabrication, and performance of high-efficiency transmission gratings fabricated in bulk fused silica for use in high-power ultraviolet laser systems. The gratings exhibit a diffraction efficiency of 94% in order m=-1 and a damage threshold greater than 13>J/cm( 2) for 3-ns pulses at 351 nm. Mo…
A new variation of poly(ortho ester)s prepared by the addition of diols to the diketene acetal 3,9-diethylidene-2,4,8,10-tetraoxaspiro[5.5]undecane is described. In this variation, a short segment of a glycolic acid dimer is built into the polymer backbone. Such a material does not require the addition of acidic excip…
Abstract The clay fraction of a Spodosol and its parent rock in the Apennine mountains of central Italy were studied by powder X-raydiffraction (XRD) and infrared (IR) spectroscopy, to evaluate the possibility of transformation of chlorite into low-charge expandable minerals. Results indicated that the main phyllosili…
Abstract The melting behavior and the isothermal crystallization kinetics of linear and randomly branched poly(butylene terephthalate) System. name: poly(tetramethylene terephthalate). (PBT) samples were investigated by differential scanning calorimetry. The multiple endotherms typical of linear PBT were observed also…
Other| February 01, 1997 Determination of the content and distribution of fixed ammonium in illite-smectite by X-ray diffraction: Application to North Sea illite-smectite Victor A. Drits; Victor A. Drits Russian Academy of Sciences, Institute of Geology, Moscow, Russian Federation Search for other works by this author…
The problem of interaction of a drop with a solid boundary is formulated in the framework of a recently developed theory of the three-phase contact line motion and analyzed in the case of finite Bond and small capillary and Weber numbers. Evolution of the free-surface shape in a quasi-static regime of the drop spreadi…
A synthetic scheme was developed to prepare cationically polymerizable octafunctional monomers with silsesquioxane (T8) cores. Epoxy and 1-propenoxy functional groups were attached to the core by the hydrosilation of T with an appropriate precursor. The steric constraints and the requirements for the hydrosilation rea…
One-electron oxidation of nickel(II) 5,10,15,20-tetraaryl-2-aza-21-carbaporphyrin ((CTPP)Ni II ) and nickel(II) 2-methyl-5,10,15,20-tetraaryl-2-aza-21-carbaporphyrin ((MeCTPP)Ni II ) resulted in formation of rare organonickel(III) derivatives. The half-wave potential for the first oxidation of (CTPP)Ni II and (MeCTPP)…