Materials Literature
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Abstract The notch sensitivity of high‐density polyethylene (HDPE), polypropylene (PP), and polybutylene (PB) was evaluated using uniaxial tensile deformation and fractographic analysis. Each polyolefin was tested at relatively low and high molecular weights (MW). Only the lower MW HDPE was found to be clearly notch‐s…
Manganian adalusites, (Al1-xMnx3+)2(O/SiO4), with 0·012 ≤ x ≤ 0·22 (viridines) were synthesized along the join Al2SiO5– ‘Mn2SiO5’ under the fO2 conditions of the MnO2/Mn2O3 buffer. Their stability, miscibility, and compatibility relations were determined through seeded runs as a function of pressure, temperature, and…
The positron techniques of lifetime and Doppler-broadening were applied to vacancies in graphite. Vacancies were introduced into highly-oriented pyrolytic graphite by irradiation with 2 MeV electrons and fission reactor neutrons. The lifetime of positrons trapped at the vacancies was determined as 245±5 ps. Lifetime s…
Abstract Being byproducts, palm soapstock, palm acid oil and palm fatty acid distillates (PFAD) have a wide range of quality and composition. They also consist of many impurities and minor components. Due to development of refining techniques. PFAD have largely replaced palm acid oil, especially in the producing count…
Abstract Cs 6 Ga 2 Se 6 can be prepared from mixtures of Cs 2 Se and Ga 2 Se 3 . The transparent single crystals of the moisture sensitive compound (m.p. 685 °C) crystallize in the monoclinic system with a = 848.0(5), b = 1364.4(5), c = 1111.5(5) pm, β = 126.22(5)° (T = -150 °C, Z = 2, space group P2 1 /c). The galliu…
The dislocation structure of plastically deformed ZnS crystals has been studied using transmission electron microscopy. It is shown that both total and partial dislocations are simultaneously available in the crystal. The total dislocations are dissociated into Shockley partials.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and molecular stereochemistry of anionic difluoro(meso-tetraphenylporphinato)iron(III), a high-spin six-coordinate iron(III) porphyrinate with an unusually expanded core and a hydrogen-bonded "distal" imidazoleW. Robert Scheidt, Young Ja Lee, Shoko Tamai, and Kei…
Three cells with trigonal, orthorhombic or hexagonal symmetry have been proposed to describe M 7 C 3 carbides. Examinations of heavily faulted chromium, iron, vanadium mixed carbides present in white cast irons and in chromium steels have been performed by means of electron microscopy and diffraction. Electron diffrac…
A structural model, based on Voronoi polyhedral cells partly filled with support and metallic catalyst, is proposed for interpreting the small-angle X-ray scattering of heterogeneous catalysts. The model's properties are described, and the model is applied to porous Al 2 O 3 and Pt/porous Al 2 O 3 . Surface areas calc…
Full spectral details in support of the earlier proposed structure 1a for the antitumor antibiotic ravidomycin are presented together with an account of chemical degradation products. A complete corroboration of structure is provided by cross correlation of 1 H and 13 C nmr for ravidomycin and its diacetate 1b.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular mobilities of individual constituent carbons of solid polyesters above Tg as studied by carbon-13 nuclear magnetic resonance spectroscopyFumitaka Horii, Asako Hirai, Kouichi Murayama, Ryozo Kitamaru, and Toshimitsu SuzukiCite this: Macromolecules 1983, 16, 2, 273–2…
Magnetically induced birefringence measurements were performed in the isotropic phase of methoxybenzylidene butylaniline (MBBA). Over the entire temperature range studied, $\ensuremath{\Delta}n$ was found to be linear in ${H}^{2}$ to fields over 10 T. This result is consistent with the Landau model of the nematic-isot…
Zigzag propagation of deformation microtwins across the domain structure, as observed by electron microscopy in ordered Ni3V alloy, is shown to be due to cross-slip of partial dislocations via the stair-rod mode (Fleischer 1959). Twin bands change direction to preserve the long-range order inside domains. The peculiar…
<div class="htmlview paragraph">Structural ceramic components have been successfully operated in a diesel engine. The pistons, liner, and housing for an opposed piston, two-cycle (valveless) engine were fabricated from sintered alpha SiC. The ceramic engine was tested without any lubrication or cooling in the cy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective ring-opening polymerization of 1,4-anhydro-2,3-di-O-benzyl-α-D-xylopyranose and synthesis of stereoregular (1 → 5)-.alpha.-D-xylofurananToshiyuki Uryu, Junichi Yamanouchi, Shuji Hayashi, Hidehiko Tamaki, and Kei MatsuzakiCite this: Macromolecules 1983, 16, 2, 320–3…
Abstract Copolyimides, their microstructure being determined by the method of synthesis, were prepared by copolycondensation of 4,4′‐oxydiphthalic anhydride (1a) , 4,4′‐carbonyldipthalic anhydride (1b) , or 1,8:4,5‐naphthalenetetracarboxylic anhydride with a mixture of two diamines, hexa‐, octa‐, or dodecamethylene di…
<div class="htmlview paragraph">Monolithic ceramic filters, suitable for reducing particulate emissions to within the 0,2 g/mile emissions limit, are intermittantly loaded and regenerated. A mathematical model was developed in order to describe the processes which take place in the filter during regeneration. Th…
Bond-orientational order in materials that form three-dimensional uniaxial solids is investigated. New phases are found that scatter light strongly, like nematics, but with a quantitatively different anisotropy of scattering. X-ray scattering from these phases would also exhibit novel anisotropy. This type of order ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmog chamber studies of nitrogen oxide (NOx) transformation rate and nitrate precursor relationshipsChester W. SpicerCite this: Environ. Sci. Technol. 1983, 17, 2, 112–120Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue…
An improved cube method was developed for the computation of X-ray scattering curves of macromolecules in solution. For double-helical DNA and RNA molecules the efficiency of this method is shown. The results are compared with curves calculated by effective atomic scattering factor methods. In the small-angle and in t…