Materials Literature
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New 1,4-naphthyl and 2,6-naphthyl-containing polyarylates having inherent viscosities up to 1.28 dL/g were synthesized by the high-temperature solution polycondensation from the acid chloride of 1,4-bis(4-carboxyphenoxy)naphthyl or 2,6-bis(4-carboxyphenoxy)naphthyl and various bisphenols. Most of the resulting polyary…
A direct comparison of the magnetic structures of a surface layer and of the bulk of Ba-M-type hexagonal ferrites with iron ions partially replaced by Sc diamagnetic ions (BaFe 12− x Sc x O 19 ) has been made by simultaneous Mössbauer spectroscopy with detection of gamma rays, characteristic x-ray emission, and electr…
We studied the dependence of optical constants and microstructures of (GeTe) x (Sb 2 Te 3 ) 1- x films on composition to determine the optimal composition of phase change recording materials. The maximal differences in optical constants between crystalline and amorphous phases and the minimal crystalline grain sizes o…
Electrophoretic deposition of low voltage phosphors was successfully carried out on patterned indium–tin–oxide glass in order to develop prototype full color field emission display devices. The optimized suspension consisted of 2–3 μm size color phosphors in isopropyl alcohol, and mixed La(NO3)2 and Al(NO3)2 salts for…
An analytical model for a Skull melting set-up is presented, which describes the power absorption in the melt and the losses in the inductor coil and the cold crucible. A strong dependence of the relative size of these quantities on the applied frequency has been found. Above a characteristic frequency, where the skin…
The glass transition of polyacrylonitrile (PAN), unlike that of many amorphous and semi-crystalline polymers, ' is a source of considerable puzzlement. By DMA, it has been shown that there are two tan 8 peaks at 100°C and -150°C in unoriented PAN, while in oriented fibres, there is only a single peak at -100°C. Some a…
In water-cooled nuclear reactors, measures to decrease the radiation fields due to the deposition of 60Co on out-of-core components are important to control occupational doses of radiation and to reduce costs. In this respect, dosing of minor amounts of certain metal ions to the primary coolant can be effective. The b…
Three borate minerals—inderite, kernite, and ulexite—have been studied by Raman microscopy in the region between 4000 and 100 cm −1 . The spectra are very complex due to the presence of four possible boron clusters in either trigonal or tetrahedral coordination. All three minerals contain clusters containing one or mo…
With excitation by the light of the wavelengths longer than 320 nm, fluorescence spectra of polyethylene terephthalate (PET) films had somewhat different shapes from those excited below 300 nm through the intrinsic absorption of PET molecules. Also, in the measurements taken with a polarizer in front of the receiving…
A new cross-linking algorithm, NETSIM, is described which enables the study of continuously spatially distributed (off-lattice) polymer networks and reveals some topological features possibly associated with the enhanced mechanical properties seen in certain bimodal elastomer networks. These features are identified ba…
We report new data on the electrooptic behaviour of the semiconductor ferroelectric crystal Sn2P2S6 in the temparature region 295-390 K. At the room temperature the magnitude of the effective longitudinal electro-optic coefficient is about 50 pm/V, much larger than the value reported previously. Corresponding half-wav…
Determination of a set of processing parameters for a given material type is a complex process, and much work has been done using the framework developed in the last century by Darcy. While this model, assuming Newtonian flow through a granular (essentially a smoothed, porous) medium, has produced useful flow front pr…
The liquid crystalline material octylcyanobiphenyl was studied in the form of bridges spanning the space between two solid supports in an immiscible water bath. In the nematic phase the bridge collapses above a certain length-to-diameter ratio, consistent with the behaviour of ordinary Newtonian liquid bridges. The sm…
Low-temperature high-magnetic-field far-infrared spectroscopy and electron-spin-resonance measurements have been performed on single crystals of the cubic perovskite ${\mathrm{KNiF}}_{3}.$ We found the absorption at $48.7\ifmmode\pm\else\textpm\fi{}0.3 {\mathrm{cm}}^{\ensuremath{-}1}$ observed by Richards [P. L. Richa…
This paper studied the structure and properties of highly filled polyethylene/magnesium hydroxide composite. A third additive component was introduced to alter interfacial adhesion. Scanning electronic microscopy proved that the filler particles were totally surrounded by additive material. Interfacial adhesion played…
Abstract X-ray diffraction (XRD), infra red (IR) spectroscopy, gloss goniophotometry and stylus profilometry were used to investigate the alignment of kaolinite applied as a thin coating on a polyester film substrate. The principles and applicability of the analytical methods are reviewed and discussed in the context…
Abstract 1 H NMR relaxation data provide insight into the effects of carbon black fillers on the structure of polymer networks in products based on natural rubber so that accepted ideas concerning the interaction between elastomeric networks and active filling materials are confirmed. A new 1 H NMR relaxation experime…
Abstract Natural rubber was deproteinized with a proteolytic enzyme and surfactant to reduce nitrogen content less than 0.02%. The deproteinized rubber was further purified by acetone-extraction followed by transesterification with sodium methoxide. The density of rubber decreased and the thermal expansion coefficient…
Through combining an experimental investigation on the isothermal nanocrystallization thermodynamics of bulk amorphous selenium and a theoretical analysis, an easy and reliable way to derive the lower grain-size limit of polycrystalline materials was proposed. The grain-size limit for the polycrystalline selenium was…
Adsorption behavior of two grades of poly(ethylene glycol) (PEG) was measured on silica and alumina in the presence of other organic and inorganic additives commonly used in ceramic processing. A fractional factorial designed experiment showed that the level of adsorption was significantly influenced by the powder or…