Materials Literature
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The kinetics of the thermal decomposition of poly(vinyl chloride) (PVC) was studied by a conventional thermogravimetric technique under various heating rates in a flowing nitrogen. The kinetic model that accounts for the ef fects of scission of the polymeric chain at any time was proposed to describe the thermal decom…
Heat capacities of ${\mathrm{La}}_{2}{\mathrm{NiO}}_{4+\ensuremath{\delta}}$ crystals were measured in the temperature range 14--400 K and composition range $0.047<~\ensuremath{\delta}<~0.116$ with an adiabatic calorimeter. Heat capacity anomalies were observed in the range 230--300 K due to positional order-dis…
Cordierite‐based dielectric thick films deposited by screen‐printing on a Cu 2 O‐Cu‐96% alumina substrate were investigated with regard to microstructural characteristics, densification, and crystallization. Compared to direct deposition of the cordierite layer on metal Cu, the use of the Cu 2 O layer as a diffusion b…
has illustrated the power of crystallography in dening the three-dimensional structures of complex macromolecular assemblies. Such assemblies, usually involving several components, appear to regulate most cellular processes, including membrane receptor responses, redox processes, cell signalling, the cell cycle, DNA r…
Single crystals of rare earth orthovanadates, doped with active elements, have been obtained for the first time by a hydrothermal method. In spite of the fact that these rare earth vanadates have high melting points (> 1800 degrees C) and very low solubility, the authors have obtained these rare earth orthovanadates u…
Abstract The alignment photocontrol of liquid crystalline polymer films was achieved by a thin film of a polymethacrylate with p-cyanoazobenzene side chains as a command layer, which was exposed to linearly polarized light in advance.
Binary melt-blended mixtures of two aryl ether ketone polymers (i.e., a new poly(aryl ether ketone) (code name PK99) and poly(ether ether ketone) (PEEK), have been studied. Polymer miscibility in glassy amorphous (or melt) domains has been demonstrated for the binary blend comprising of two aryl-ether-ketone-type semi…
ABSTRACT A new Line Intersection (LI) procedure for determining sterilization value (F o ) and quality or nutrient retention (cook value: C o ) was developed using the original Equivalent Point Method (O‐EPM). Analysis of 30 conventional and 5 simulated thermal curves showed excellent agreement between F o values dete…
Both the energy losses of π electron plasmon and valence electron plasmon in polycrystalline graphite have been measured by reflected electron energy loss spectroscopy (REELS). It was found that when crystallites are smaller than 10 nm, the π plasmon energy is lower than the value estimated from the valence plasmon en…
This brief report (i) presents equations that govern the balance of tangential forces in interfaces between isotropic viscous fluids and nematic liquid crystals, and (ii) establishes the physical origin of nematic Marangoni flows. It is shown that surface gradients in the orientation dependent surface free energy give…
Grain-boundary impurity diffusion of Au along the incoherent twin boundary in a diffusion-bonded Cu bicrystal has been studied by the serial sectioning technique. The measured penetration profiles had a rather atypical shape which we interpreted in terms of structural multiplicity of the grain-boundary structure. A me…
Correlation between the shape of Raman, photoluminescence (PL) and Electron Spin Resonance (ESR) signals in CVD diamond films was examined for both undoped and nitrogen-doped films. No correlation was observed between the shift of the diamond Raman line and its linewidth, even for the films produced under essentially…
The phase assemblage formation resulting from hydration of a tetracalcium aluminoferrite (ferrite) powder (4CaO·Al 2 O 3 ·Fe 2 O 3 ) was investigated by isothermal calorimetry, X ray diffraction analyses and scanning electron microscopy (SEM). Hydration of the ferrite powder was carried out isothermally at 50°C in 1·0…
Mixed radioactive and chemical wastes stored in tanks across the DOE complex generate hydrogen, ammonia, nitrous oxide, and nitrogen by a complex series of radiolytic and thermolytic reactions. Flammable conditions may result when these gases accumulate in the dome space of the waste tanks. A phenomenological model wa…
The transformation of X‐phase SiAlON (a composition of approximately Si 3 Al 6 O 12 N 2 ) to 3/2 mullite (3Al 2 O 3 ·2SiO 2 ) plus vitreous silica (SiO 2 ) at temperatures >1200°C has been studied in polycrystalline ceramics via transmission electron microscopy. The transformation of X‐phase SiAlON to mullite is ob…
Used Galvinoxyl as catalyst, the phase transfer catalyzed method of oxidation of primary amines to symmetrical azobenzenes with a saturated solution of potassium ferricyanide in 2N aqueous potassium hydroxide and dichloromethane is described for the first time in this paper. The reaction has intimate relation with Ham…
HFC-365mfc and HFC-245fa are now well documented as promising blowing agents, and their production will come on stream in a few years. However, none has the same ideal boiling point as CFC-11 or HCFC-141b. Blends may offer the best compromise to customize the different end-use requirements. Two different directions fo…
Density and viscosity of poly(ethylene glycol) nonylphenyl ether (PEG-NPE) saturated with supercritical carbon dioxide (SC CO2), as well as the interfacial tension in the PEG-NPE-SC CO2 system, were evaluated for the temperature range of 323 K to 343 K and pressures of 10.0 to 25.5 MPa. Remarkable polymer swelling as…
The interface between thin films of polystyrene (PS) and polyparamethylstyrene (PpMS) was investigated in the presence of the diblock copolymer P(S-b-pMS). The use of neutron reflectivity and 15N nuclear reaction analysis in combination with suitable deuteration of the components provides information on the interface…
A high-speed photographic film record of a Taylor impact experiment was analysed to determine the strain, strain rate and stress. The stress was calculated on the basis of an interpretive analysis by Taylor involving the motion of a plastic wave in the material. The data on drawn OFE copper produced stresses from 300…