Materials Literature
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The kinetic theory developed in [1] for solutions of nonhomogeneous nematic liquid crystalline polymers (LCPs) of spheroidal molecular configurations is extended to account for the translational diffusion and the related spatial density variation. The new theory augments the effect of the density variation to the inte…
This paper reports on the results of investigations into the influence of variations in the chemical composition of the aromatic core of cyano-containing molecules of liquid crystals on their dielectric properties in the frequency range 1–2000 MHz. It is shown that the dispersion of the longitudinal permittivity is ad…
An integrated Mach-Zehnder interferometer made of electro- optic (EO) polymers with a dimension of 331.2 cm was fabricated as a wideband rf receive antenna. When an electric field is applied to the interferometer arm(s) made of EO material, a phase delay is generated that results in a net imbalance in the interferomet…
Investigations of thermotropic phase transitions performed on organocyclosiloxanes [PhSi(O)OSiR]6, where R is Me3, Me2(CH2Cl) or Me2(CH≃CH2), have revealed that all these hexamers are mesomorphic compounds. The hexamers exhibit uncommon polymesomorphic behaviour forming two quite different mesomorphic structures. The…
Abstract This paper focuses on experimental observations of poly(vinyl chloride) (PVC) degradation during injection molding. Degradation of poly(vinyl chloride) has been extensively studied. These studies have been performed in quiescent systems with very little or no strain applied to the sample. However, during proc…
The mechanical behaviour of long discontinuous glass fibre (LGF) reinforced polypropylene (PP) composites filled with talc or calcium carbonate fillers was studied. Sample specimens were processed by injection moulding, after which tensile and impact properties were analysed. In addition, scanning electron microscopy…
Condensation of octa(aminophenyl)silsesquioxane with 4-(trifluorovinyloxy)benzoyl chloride affords new fluoroolefin functionalized silsesquioxanes in good yield. The new octa-trifluorovinyl functionalized monomer undergoes thermal copolymerization with established trifluorovinyl aryl ether terminated perfluorocyclobut…
Structural phase transitions and molecular motions in (CH3NH3)2CoCl4, (C5H5NH)2ZnCl4, and [(CH3)3CNH3]2ZnCl4 were investigated by differential scanning calorimetry (DSC) between about 130 K and the melting points. All of the compounds showed at least one structural phase transition over the temperature region investig…
Abstract The reversible switching of uptake and release of the proteins lysozyme (LYZ, IEP = 11.1) and human serum albumin (HSA, IEP = 4.8) at the surface attached polyelectrolyte multilayer (PEM) consisting of poly(ethylene‐imine) (PEI) and poly(acrylic acid) (PAC) is shown. Protein adsorption could be switched by pH…
A numerical procedure for calculating the equilibrium thickness distribution of a thin layer of deuterium and tritium on the inner surface of an indirect drive target sphere (~2.0 mm in diameter) is described. Starting with an assumed uniform thickness layer and with specified thermal boundary conditions, the temperat…
Abstract This paper presents results of a study of melt‐processed immiscible polymer blends of high impact polystyrene (HIPS), liquid crystalline polymer (LCP) and carbon black (CB). Relationships between composition, electrical resistivity and morphology of the blends produced by Brabender mixing followed by compress…
Simple predictions are made for the change of the crystal orientation during plastic deformation of body-centred cubic metal crystals with tensile axes on a {110} plane. Three alternatives can be clearly distinguished: screw dislocation may slip on {112} planes only, on {110} planes only, or on both types of planes. A…
The existing analyses on extraordinary optical transmission through apertures on a metal screen have been carried out assuming perfect conductivity or by examining arrays of closely spaced holes with subwavelength dimensions. We present an electromagnetic analysis of a single hole (modeled by use of an array of distan…
Abstract An autoclave hypercritical drying procedure has been used to prepare precursors of MgO from Mg(OCH3)2. This material was prepared with a specific surface area of 1200 m2 g 1. The dehydrated materials consisted of much smaller crystallites than conventionally prepared MgO and were free of OCH3 groups. The prec…
Abstract Stable polypyrrole dispersions were prepared by chemical oxidative polymerization of pyrrole in an aqueous medium containing different anionic salts ‐ sodium benzoate, potassium hydrogen phthalate and sodium hydrogen succinate. Results of the elemental analysis and FT‐IR spectroscopy confirmed that the anioni…
The characteristics (phase composition, grain shape, grain size distribution, and specific surface area) of Ce 0.78 Gd 0.22 O 2-δ nanopowders produced by exposing the target to pulsed CO 2 laser radiation are reported. Reasons for a threefold increase in the output of the experimental powder-preparation unit (up to 60…
The effect o f low-temperature plasma treatment on the surface mod ificati on of cotton and polyester fabri cs has been in vestigated. T he experimental results show tlwt the method is useful in improv ing the wettability o f cotton and po lyester fabrics. The surface resistivity of cotton and polyester is dramaticall…
Various types of zinc oxide (ZnO) nanocrystais were synthesized by physical vaporization of zinc powders without the presence of catalysts and a subsequent exposure to air at a high temperature. These crystals were found to be composed of ZnO nanowires, sheets, and tetrapods. They were observed to crystallize as wurtz…
The study of the chemical composition of borate glasses obtained in graphite ampoules under pressures of 3 -7 GPa and at temperatures above 1700 K have shown the presence of a considerable (5-10 at.%) amount of calcium that enters the glass, most likely, from the pressure-transmitting medium.As a result, the physical…
Devido ao baixo custo de produção e excelente biodegradabilidade, o amido constitui-se em matéria-prima promissora para a produção de plásticos biodegradáveis. No entanto, a grande hidrofilicidade dos filmes à base de amido representa uma séria limitação tecnológica à sua comercialização, uma vez que as propriedades d…