Materials Literature
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Abstract Method of polyolefin surface activation via covalent grafting of polyperoxide nanolayer by free radical mechanism has been presented. The features of such the nanolayer formation under the thermoprocessing conditions, i.e.: formation of 3D crosslinked network in polyperoxide bulk; and its grafting with comple…
We report on the optical and structural properties of a series of ZnO1−xSx films deposited by radio-frequency sputtering on float glass and sapphire substrates. In the range 0 < x < 0.4 we find that the films have wurtzite symmetry and the lattice constant varies linearly on the composition as confirmed by photoelectr…
Abstract Summary: Poly(ethylene glycol) (PEG) networks were synthesized by γ‐irradiation. The crystalline behavior of PEG was investigated by differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction (WAXD). It was shown that the crystallinity of PEG is dramatically lower in the cross‐linked networks th…
The transformation of the director configuration upon changing boundary conditions from planar to homeotropic for bipolar nematic droplets dispersed in a polymeric matrix was studied. The characteristic textural patterns are presented for droplets with different concentrations of homeotropic surfactants, and their ori…
Power capacitors (PC) may be impaired by the presence of harmonic components. An adequate evaluation of the degradation process imposed by harmonics on a PC should take into account the long-term mechanisms of degradation of PC and the possible additional stresses imposed by the harmonics. This paper presents the degr…
Abstract The dynamic rheological properties of uncured dispersions of silica in liquid polyisoprene are measured and are used to assess filler-filler networking. An increase in the dynamic storage modulus ( G ′) is observed with decreasing polyisoprene molecular weight and with increasing silica concentration. For suf…
The effect of plasma fluorination on the band gap, 2p core-level energy, and the dielectric behavior of porous silicon (PS) prepared under constant conditions has been examined using Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, photoluminescence, and reflection. It has been found that wit…
Amorphous silver, copper, gold, and iron films of a thickness between 6 and 350 nm are grown on polymeric substrates by vacuum evaporation. The nanostructure of the films is investigated. The dependence of the conductivity on the film thickness is obtained, and a correlation between the surface morphology and the cond…
Abstract Cellulose acetate has been utilized in a variety of separation and purification processes. In membrane separation, cellulosics, in particular cellulose acetate, have played important roles. Hemodialysis and desalination are the established fields where acetate membranes have been applied. Recently, a new appl…
Nanograined BaTiO 3 ceramics prepared from 40‐nm‐size BaTiO 3 nanopowders exhibited the cubic as well as the tetragonal phase, while nanograined BaTiO 3 ceramics prepared from BaTiO 3 nanopowders coated with Mn had only the tetragonal phase. The dielectric constant of the latter was 10 times larger than that of the fo…
Abstract Three methods were used to synthesize a series of the title compounds. The ketones absorb in the visible region, and upon protonation (pH<6) they are converted to hydroxy‐substituted heptamethine cyanines that show an intense absorption in the near‐infrared region (>700 nm). The conversion is reversible…
Abstract The uniaxial tensile characteristics of blends of an ethylene‐vinyl alcohol copolymer (EVOH‐32 mol% ethylene) with an amorphous PA and/or a nylon‐containing ionomer, used as barrier layer in multilayer food packaging structures, was assessed in this paper. The stress‐strain behavior of these materials at elev…
Abstract A vertical‐alignment (VA) cell of nematic liquid crystals (LCs) was prepared using photoirradiated thin films of a poly(methacrylate) with mesogenic moieties of 4‐trifluoromethoxyazobenzene as the side chains. Optical anisotropy was generated by oblique irradiation of the azobenzene‐containing polymer films w…
High strain actuation can be obtained from crystallographically textured piezoelectric ceramics. Single crystal piezoelectrics demonstrate high strain because crystal orientation can be controlled - the perfect lattice simplifies crystal orientation. Single crystals actuate better than typical ceramics, but are expens…
In this paper, a regression model was constructed to optimize the relationships between the void fraction of foamed HDPE/wood-flour composites, the processing conditions (extruder’s die temperature and screw speed rate), and the formulation compositions [chemical foaming agent (CFA) concentration and the moisture cont…
The effect of the conditions of synthesis and of the substrate material on the metal-semiconductor phase transition in thin vanadium dioxide films prepared using laser ablation has been studied. The broadening of the hysteresis loop is shown to be due to a decrease in the size of the crystal grains making up the film.…
Abstract A divanadium-substituted derivative of 12-tungstosulfate(VI), [S(V2W10)O40]4− was prepared as the tetrabutylammonium (n-Bu4N+) salt by heating a 50 mM (M = mol dm−3) W(VI)–20 mM V(V)–0.5 M H2SO4–50% (v/v) CH3CN system at 70 °C for 24 h. The [S(V2W10)O40]4− anion was transformed spontaneously into a monovanadi…
Crack healing in silicon carbide was investigated by introducing cracks into specimens and subsequently heat‐treating the specimens. It was observed that cracks were healed, dramatically increasing the strength, by being filled with amorphous silica produced by the oxidation of silicon carbide. It was shown that the r…
Abstract Thermochemically partially devulcanized ground tire rubber (GTR D ) was revulcanized in compositions with different virgin rubbers. Two different devulcanizing groups (mixture of softeners) with and without processing oil have been used for GTR treatment. As virgin rubbers methylstyrene/butadiene (SBR), isopr…
We studied the optimal cell retardation value that shows the maximal transmittance in a fringe-field-driven homogeneously aligned (HA) nematic liquid crystal (LC) cell. When the LC with positive dielectric anisotropy is used, the transmittance is much higher than that of an in-plane-field-driven HA cell. The unexpecte…