Materials Literature
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We investigate a nonlinear dynamical system which "remembers" preselected values of a system parameter. The deterministic version of the system can encode many parameter values during a transient period, but in the limit of long times, almost all of them are forgotten. Here we show that a certain type of stochastic no…
This article completes the presentation of a model of photoelectric phenomena taking place in metal–insulator–semiconductor (MIS) structures at low electric fields, which was introduced in Ref. [H. M. Przewlocki, J. Appl. Phys. 78, 2550 (1995)]. A solution and analysis of model’s equations is given for the general cas…
Disordered materials (glasses and amorphous substances, melts, polymers, biological media, etc.) are an important class of objects. Despite the chaos usually associated with their structure, glasses and amorphous substances of various kinds (semiconducting, dielectric, metallic) possess a universal spatial scale lengt…
Abstract Vulcanization of styrene-butadiene rubber, as accelerated by a series of sulfenamides and sulfenimides prepared from various aromatic heterocyclic thiols and various aliphatic amines, was studied using the curemeter under isothermal conditions. Further studies using MOPAC AM1 semiempirical quantum mechanical…
Dielectric spectroscopy (DS) and Thermally Stimulated Current (TSC) are employed to study the dynamics of Poly(VinyliDene Fluoride-TriFluoroEthylene) copolymers. Dielectric spectra reveal the existence of three relaxation processes: the β relaxation or the glass transition relaxation, the secondary γ relaxation presen…
In this report are presented the results of XAS investigations on zinc intercalated V20 s. EXAFS spectra recorded at the Zn k-edge showed differences in the first shell of intercalated Zn 2 as the concentration increased. The interaction of zinc ions with the surrounding V20 s aerogel structure is discussed as well.
In the present paper the effect of crystallization conditions on the melting temperature (Tm ) of chemically cross-linked gelatin is studied by means of differential scanning calorimetry (DSC) and microhardness (H) measurements as extension of our recent findings (Ref. [11]). A rather unusual situation when polymer cr…
In this paper we map the experimental trajectories of two deformable drops in planar extensional flow and compare the experimental results with theoretical calculations for spherical drops. We examine the effects that deformation, initial position, and viscosity ratio have on the interaction of two drops and the neces…
Radical copolymerizations of zinc dimethacrylate and 2-(N-ethylperfluorooctanesulphonamido)ethyl acrylate initiated with di-t-butyl peroxy di-isopropylbenzene were carried out in various amounts of DMF for 10 h at 140 °C in the presence of hydrogenated nitrile-butadiene rubber (HNBR) as a simulation of copolymerizatio…
Abstract A number of macrocyclic diamides have been synthesized from the reaction of a diacid dicarboxylic dichloride with primary diamino compound in the presence of magnesium oxide‐silica gel at room temperature in good yields. Using urea and thiourea as well as diamines to produce the corresponding macrocycles in t…
This fundamental study focuses on the influence of blowing agent on bubble growth during thermoplastic foam extrusion. The extruded molten mixture expands and cools simultaneously when exposed to ambient conditions. The bubble growth is influenced by the concentration-dependent blowing agent diffusion coefficient, tra…
Uniform, ultrafine, microcrystalline, hard, pyroxenic glass‐ceramic materials have been obtained successfully from basalt rock; instead of adding nucleation catalysts, the FeO:Fe 2 O 3 , CaO:Na 2 O, and CaO:MgO ratios have been rectified. This process has been accomplished by deliberately adding the smallest permissib…
Molecular-dynamics simulations for poly(vinyl alcohol) hydrogels have been carried out in a wide temperature range 150-400 K to examine effects of polymer chains on structure and dynamics of supercooled water in hydrogels. A fragile-strong character of water under perturbations of polymer chains is examined. Polymer c…
particularly interesting.
The mechanical properties viz., tensile strength, elongation at break, tear strength and fatigue life of epoxidized natural rubber (ENR 25) was studied using a semi-efficient vulcanization system. Carbon black and calcium carbonate were chosen as the fillers with loading up to 60 phr. SMR L grade natural rubber was us…
Successful measurement of electrochemical noise (EN) signals requires that a number of preconditions be fulfilled. In particular, fundamental understanding of the dynamics of the corrosion system concerned must be combined with an appreciation of the way in which the measurements are made. Broader acceptance of the te…
In order to investigate the co-firing feasibility of a double-layer ceria-zirconia electrolyte for low-temperature Solid Oxide Fuel Cells (SOFCs), interdiffusion phenomena between yttria-stabilized zirconia (YSZ) and cerium-gadolinium oxide (CGO) were studied in the temperature range 1200°C to 1500°C with the aid of S…
In situ development of La‐ß‐Al 2 O 3 (LBA) platelets in alpha‐Al 2 O 3 was studied as a function of the preparation method: a conventional solid‐state reaction of commercial Al 2 O 3 powder and La(NO 3 ) 3 as well as a sol‐gel method starting with boehmite and the same La 2 O 3 precursor. In both cases, homogeneous di…
Abstract Polypropylene(PP) and polyamide6(PA6) were extruded with a single screw extruder. It was found that when PA6 was in the dispersed phase, it could deform and fibrillate in the PP matrix in the shear force field generated by the rotating screw. Dynamic mechanical analysis and mechanical tests showed that the me…
The first synthesis of chitin derivatives with well-defined block copolymer side chains, i. e., chitin-graft-[poly(2-methyl-2-oxazoline)-block-poly(2-phenyl-2-oxazoline)] (5), chitin-graft-[poly(2-methyl-2-oxazoline)-block-poly(2-butyl-2-oxazoline)] (6), and chitin-graft-[poly(2-methyl-2-oxazoline)-block-poly(2-tert-b…