Materials Literature
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Research efforts conducted in the Chemistry Division of the Oak Ridge National Laboratory on the preparation of polymeric precursors to boron nitride are reviewed. They evolved from the preparation of powders, which contained significant amounts of residual carbon, derived from the pyrolysis of aminoborane polymers to…
The surface emittance of fully oxidized copper is experimentally determined as functions of wavelength between 2-10 /tin, the direction between the normal and grazing angles, and the temperature between 400-700°C. Clean copper surfaces, heated and exposed to air, begin to oxidize immediately. After a sufficient heatin…
Abstract Aluminoxane catalysts and anionic initiators can polymerize 3‐butyrolactone, 3‐BL, to high molecular weight stereoregular polymers. With the racemic monomer, [R,S]‐3‐BL, anionic polymerization with alkali metal complexes can form syndiotactic polymers and aluminoxane catalysts can form either highly isotactic…
The orientation of an object is determined by rotation angle and rotation axis. In the case of randomly oriented nonsymmetric objects, the distribution of rotation axes is uniform. But symmetry destroys uniformity. An orientation of a symmetric object can be represented by different but symmetrically equivalent sets o…
Germanosilicate glasses exhibit a significant photosensitive response which has been linked to the presence of oxygen-deficient germanium point defects in the glass structure. Based on this correlation, a process which produces highly photosensitive thin films without the use of hydrogen exposures, has been developed.…
Abstract Polyoxazolidone composites were prepared from polymeric isocyanate (PAPI 901) and epoxides (Epon 828 and DEN 431) in the presence of an oxazolidone‐forming catalyst, triphenylantimony iodide. The effects of isocyanate to epoxide equivalent ratio, type of epoxide, and amount of fiberglass reinforcement on the…
The paper reports and discusses the results of an experimental and numerical activity, aimed to the characterization of the influence of hydrogen on the mechanical properties of a few high chromium martensitic steels which are candidates for fusion reactor and chemical applications. Experiments were conducted with the…
The effects of oxygen partial pressure on Y123 single-crystal growth, morphology and properties were investigated. YBCO (Y123) single crystals were fabricated using the crystal pulling method under 1 atm oxygen pressure. Compared with crystals fabricated under air atmosphere, it was found that this high oxygen partial…
By the action of a small amount of an acid, 2-phenyl-2-(2-tosyloxyethyl)-1,3-dioxolane decomposed to give p-toluenesulfonic acid resulting in the proliferation of acid molecules. The decomposition manner was stepwise in solution state and autocatalytic in polymer film. The sensitivity of an acid-catalyzed photoimaging…
Two devices for quantifying the basis weight and fiber orientation distribution func tion in nonwoven webs have been developed and studied. The basis weight device measures the attenuation of a light beam by the fabric. The particular device is im plemented, calibrated, and tested at speeds up to 400 m/min. By statist…
The temperature variations of the refractive index and of the linear birefringence have been studied in flux-grown nominally pure and (SBT) single crystals (x = 0.02, 0.08 and 0.17) in the temperature range from 5 to 300 K. Polar domain structures were studied by polarizing microscopy. In SBT (x = 0.17) two phase tran…
Cured silicone modified polyimide (PI) on packaged dice and blanket wafers were dry etched in a ambient under varying conditions in both a production reactive ion etching (RIE) tool in an integrated circuit (IC) clean room environment and in a desktop RIE tool in a laboratory environment. It has been consistently foun…
A description is provided of the anomalous conchiolin deposits which are formed by Pinctada maxima and which are associated with unusual mortalities. Comparisons are made with brown ring disease found in Ruditapes philippinarum and juvenile Crassostrea virginica. In P. maxima, the deposits are not organized into a rin…
Carbon residue after binder burnout was characterized for several nonstoichiometric lead titanate powders. Thermal decomposition of the poly(methyl methacrylate) (PMMA) binder was performed in nitrogen at 600°C. A drastic decrease in carbon retention was obtained in the case of the titanium‐rich samples. The amount of…
Abstract Durch chemischen Transport mit Cl 2 oder TaCl 5 /Cl 2 als Transportmittel wurden ausgehend von entsprechenden Ausgangsbodenkörpern im Temperaturgefälle T 2 → T 1 (z. B. 1000 °C → 980 °C) farblose {braunschwarze}, hexagonale Einkristalle von Th 4 Ta 18 O 53 {U 4 Ta 18 O 53 } mit den Gitterkonstanten a = 6,2554…
The transformation behaviour of Cu-Mn-based high damping alloys aged within a miscibility gap has been studied intensively using transmission electron microscopy (TEM), with particular attention to fine-scale dynamical movements in segregated microstructures, termed ‘flickering’. As ageing proceeds, features appear in…
The equilibrium of an elastic thin plate in contact with a drop of fluid (both surrounded by another fluid), including capillarity (i.e., the thermodynamic properties of the fluid–fluid and solid–fluid surfaces), leads to a variational problem with discontinuities of some derivatives of the elastic displacement of the…
We report x-ray photoemission spectra of poly(methyl methacrylate) (PMMA). XPS spectra were measured with the SSI, SSX-100 model, using monochromated Al Kα x-rays. We present the survey spectrum (binding energy range of 0–1100 eV) and narrow spectra of C 1s and O 1s. The polymer is used as a reference to study the inf…
Changes in the photoluminescence (PL), microstructural morphology and the chemical nature of the surface of porous silicon (PS) when it is attacked with a 1:1 mixture of concentrated hydrofluoric acid and water have been studied. As the PS dissolves, the porous structure is essentially destroyed while the appearance a…
The pyrolysis kinetics of cellulosic uncoated printing and writing paper, which is one of the principal materials contributing to the municipal solid waste (MSW) of Taiwan, was investigated with a thermal gravimetric analysis (TGA) reaction system. The experiments were carried out in a nitrogen environment in the 450–…