Materials Literature
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Different semiaromatic polyamides (SAPA) have been synthesized by step-growth polymerization of an aliphatic diamine, M (the 2-methyl 1,5-pentanediamine), and isophthalic acid, I, or terephthalic acid, T, or mixtures of these two diacids. The influence of the relative amount of randomly distributed MT units on the vis…
Large-volume usage of textile and carpet fibrous waste may be achieved with a low-cost material that has woodlike properties. Formulations and properties of composites, laminates, and honeycomb sandwich constructions made from carpet and textile fibrous waste in a high-modulus phenol formaldehyde matrix are described.…
Two-photon-excited luminescence (TEL) spectra have been recorded in the blue (400–500 nm) and near-ultraviolet (300–400 nm) ranges for diamond particles with 4 nm average size, which were obtained by detonation synthesis from explosives. The observed TEL bands are attributed, by comparing the obtained spectra with the…
The systems were examined as a cathode for use in solid oxide fuel cells. The electrical conductivity and cathodic polarization on an 8 mol % yttria‐stabilized zirconia (8YSZ) electrolyte had acceptable values for certain compositions. Thermal expansion measurements were taken, showing compatibility of Mn‐rich composi…
The compatibility of poly(ethylene terephthalate) and its copolymer containing isophthalate units with epoxy-modified lignin has been studied. The following methods have been used: DSC, thermogravimetry, IR spectroscopy, contact angle measurements and dielectric properties determination. The optimum compatibility rati…
In this paper, the concept of Environmentally Conscious Ferroelectrics (abbr. as Ecoferroe-lectrics) is emphasized, the evaluation methodology of the preparation, processing, and applications of ferroelectrics on environmental load is proposed, the present researches on Ecoferroelectrics are outlined, and some aspects…
Abstract Vermiculite crystals from Santa Olalla, Spain, were first Na exchanged and then intercalated with monomethylammonium (= NH 3 (CH 3 ) + , MMA) and dimethylammonium (= NH 2 (CH 3 ) 2 + , DMA) molecules, respectively, by immersion in 1 M ammonium-chloride solutions at 65°C for 2–3 wk. MMA-and DMA-exchange with v…
A process for the manufacture of highly inorganically filled starch based fiber reinforced foam composites for food-packaging use is described. Starch, obtained from potato, corn, or other sources, is used as binder to form net shape foam composite substrates under hydrothermal conditions. The starch content is 25 to…
The activation energy of ionic conductivity in a variety of glasses has been studied from a unified point of view. A plot of the activation energy as a function of the cation–anion distance manifests that the glass can be divided into two groups; the examples being chalcogenide and oxide glasses. In the chalcogenide t…
Raman spectroscopy was used as a complementary tool to thermal and x-ray methods in phase equilibrium studies of the NaNO3–KNO3 system. Based on the microscopic structures of the system, the Raman technique confirned the phase diagrams obtained by thermal studies. Structural phase transitions of the R3m solid solution…
Abstract : Non-woven fabrics composed of nanofibers have a large specific surface area and small pore size compared to commercial textiles. These properties make such non-woven fabrics excellent candidates for filter and membrane applications, particularly in the areas of chemical and biological agent defense. Nanofib…
Optimal coil configurations in a split-type superconducting MRI magnet have been investigated, and the feasibility of the compact and high performance magnet is presented. A highly homogeneous magnetic field of about 10 ppm/50 cm diameter spherical volume (DSV) is attainable by eliminating error fields of higher order…
Manitoba Hydro applied directional couplers for on-line partial discharge measurements on selected rotating machines beginning in 1981. With the instrumentation available at that time the measurement was vulnerable to the effects of noise external to the machine. There have been improvements in the available coupling…
Traditionally, the blending composition of a composite yams has been analyzed by human visual inspection, but such a method is time-consuming and inaccurate. In this study, we apply image processing techniques to analyzing cross sections of a PET/ Rayon composite yam, obtaining single fiber positions in the image with…
We have performed both conventional canonical molecular dynamics (MD) and multicanonical MD (MMD) simulations for a single di-block polyampholyte in vacuum to investigate possible structural phase transitions. The conventional canonical MD simulation for temperature T∗ > 0.05 gives reliable results, since these are in…
We investigated the dielectric properties of a new type of polyethylene (PE) polymerized with a single-site catalyst. The new PE has much higher dielectric strength and volume resistivity than both conventional low-density PE and linear low-density PE. The increase in the density is considered to be responsible for th…
An encapsulating layer was deposited on the surface of tetragonal zirconia polycrystals doped with 3 mol% of yttria (3Y‐TZP), to prevent low‐temperature environmental degradation (aging) of the material. The layer, which was composed of silica and zircon, was formed on the surface by exposing the specimens next to a b…
First-principles molecular orbital calculations for ZnO with 3 d transition-metal (TM) impurities ranging from Mn to Cu have been carried out in order to investigate the relationship between TM impurities and oxygen adsorption in ZnO ceramics. Two kinds of model calculations, i.e., the TM impurities with various forma…
Abstract We report a “delayed neutralization” process for the preparation of highly‐ordered aluminosilicate MCM‐41 molecular sieves with high thermal and hydrothermal stability, and sharp pore size distribution. However, the structural order and pore size are dependent on the carbon chain length. In the mixture surfac…
The microstructure of a silicon carbide-carbon solid-solution powder (SiC-C), obtained from a fine powder of silicon and thermal expansive graphite, is investigated by X-ray powder diffraction methods. The microstructure is characterized by Williamson-Hall analysis and the strain-field model suggested by van Berkum et…