Materials Literature
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Abstract Stainless steels have a great variety of potential applications in the petroleum industry, mainly as an alternative to carbon steel in corrosive environments. Within a number of media that can cause corrosion problems with these materials, only chloride solutions and hydrogen sulfide are of importance in oilf…
When a textile material absorbs a liquid, its color appears deeper than that when it is dry because of the difference in reflectance. The difference in the diffuse reflection between the air and the liquid leads to a difference in color depth between the dry and wet conditions. Using this observation, it is possible t…
The first part of this work deals with the effect of ageing (artificial weathering) on an intumescent flame-retarded ammonium polyphosphate (APP)/polyamide-6 (PA-6)/polypropylene (PP) blend. The study of the fire properties using the cone calorimeter shows a decrease in the performance caused by the artificial weather…
Abstract The oxidative addition of bis(dibenzylideneacetone)platinum(0) to meso ‐bromo‐5,15‐diarylporphyrins in the presence of PPh 3 has been shown to be an effective way of synthesising η 1 ‐organoplatinum porphyrins in high yields. This methodology has been extended to synthesise various palladio‐ and platinioporph…
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.…