Materials Literature
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The pressure-induced Raman shifts for several internal vibrations of poly(methyl methacrylate) (PMMA) and polycarbonate (PC) were studied over the range 0–35 kbar. The 600 cm−1 C–C–O and 813 cm−1 C–O–CH3 symmetric stretches of PMMA were found to have mode Grüneisen parameters of 0.081±0.002 and 0.047±0.001, respective…
Abstract Bronzefarbenes Di(phthalocyaninato(1−))lanthanidpolybromid, [Ln(Pc − ) 2 ]Br y (Ln = La…(Ce, Pm)…Lu; y > 1,5) wird durch Oxydation von ( n Bu 4 N)[Ln(Pc 2− ) 2 ] mit überschüssigem Brom dargestellt. In den UV‐VIS‐NIR‐Spektren treten die für den Pc − ‐Liganden typischen B‐ und Q 1 ‐Absorptionen bei ≈ 14 kK…
Abstract The new compounds ThCu 1-x PO and ThCuAsO with ZrCuSiAs-type structure were prepared in well crystallized form by chemical vapor transport reactions. Th 2 Ni 3-x P 3 O with a new structure type was obtained by reaction of ThO 2 with the other elemental components in an alumina crucible at high temperatures.…
The crystal and molecular structure of a lanthanum(III) mellitate, La2C12H22O23, has been determined by X-ray structural analysis using a combination of direct and heavy atom methods. The complex crystallizes in the monoclinic space group P21/n with unit-cell dimensions of a = 6.723(4), b = 11.368(5), c = 29.813(4) Å…
Steady thermocapillary flows in cylindrical containers with unit aspect ratio (radius = depth) are studied numerically and by scaling analysis in order to investigate how the velocity and thermal fields are influenced by the method of heating. Two heating modes are considered: heating by a uniform temperature cylindri…
Experimental data from ultrasonic and inelastic neutron scattering measurements are analyzed for different families of Cu-based shape-memory alloys. It is shown that the transition occurs at a value, independent of composition and alloy family, of the ratio between the elastic constants associated with the two shears…
The simple die‐pressing technique has been used to fabricate thick‐layer zirconia/alumina ceramic laminates in the forms of film/substrate and multilayer systems. A “vibration sieve” method is used to achieve uniform layer thickness. In order to suppress surface crack initiation and propagation, the laminates are desi…
A 3.6-kb EcoRI-SalI fragment of Paracoccus denitrificans DNA hybridized with a DNA probe carrying the poly(3-hydroxyalkanoate) (PHA) synthase gene (phaC) of Alcaligenes eutrophus. Nucleotide sequence analysis of this region showed the presence of a 1,872-bp open reading frame (ORF), which corresponded to a polypeptide…
The effect of poly(vinyl alcohol) adsorption on segregation was quantitatively studied by a model experiment of one–dimension drying and simulated by a mathematical model. It was clear that the adsorption of PVA on alumina particle was a slow process, and the adsorbed binder was not desorbed at higher temperature. PVA…
Thin poly(phenylene sulphide) foils were bombarded with fast atomic ions ${(}^{4}$He, $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{32}\mathrm{S}$, $^{79}\mathrm{Br}$, $^{127}\mathrm{I}$) in the energy range between 2.5 to 78 MeV. In order to maintain the same ion track size for all impacting ions, their initial velocity w…
Autologous grafts are superior to their synthetic counter-parts for grafting arteries smaller than 6-mm diameter both in terms of acute thrombogenicity and chronic intimal hyperplasia. Endothelial cell (EC) coating of the blood contacting surface may reduce thrombogenicity of synthetic small diameter vascular prosthes…
The order–disorder transition (ODT) and the ordering kinetics have been studied in two symmetric diblock copolymers of styrene and isoprene and their binary mixtures with rheology. The binary mixtures formed a single microdomain (with lamellar morphology) composed of short and long chains as confirmed by small angle x…
Abstract A theoretical basis for the prediction of the properties of mixtures of virgin and reprocessed polymers is presented. The concept is developed using equations that describe the loss of polymer properties as a function of processing cycles. These equations correspond to properties that are important in charact…
Article The Reaction of Molecular Oxygen with Silver at Technical Catalytic Conditions: Bulk Structural Consequences of a Gas-Solid Interface Reaction was published on February 1, 1996 in the journal Zeitschrift für Physikalische Chemie (volume 197, issue 1-2).
The stress‐strain behavior of a continuous‐fiber‐reinforced ceramic matrix composite has been measured over a wide range of loading rates (0.01 to 500 MPa/s). It was found that the loading rate has a strong effect on almost every feature of the stress‐strain curve: The proportionality stress, the composite strength an…
Abstract A series of twelve mononuclear ortho ‐palladated complexes incorporating a Schiff base and a β‐diketone ligand have been synthesised. These compounds have four nonequivalent terminal chain positions and differ in the number and position(s) of chiral chains [( R )‐2‐methylheptyl] in the structure. A study of t…
Abstract Poly[[2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]-1,4- or 1,2-phenylene]vinylene] was synthesized by polymerizing 4- or 2-bromo-2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]styrene with a palladium catalyst, respectively. They were deprotected and chemically o…
The 351 nm photoelectron spectra of Mo− and MoO− have been measured. The electron affinity of atomic molybdenum is 0.748(2) eV and that of molybdenum monoxide is 1.290(6) eV. The term energies of several MoO electronic states not previously observed are obtained and compared with ab initio predictions. The ground stat…
Abstract Rectangular plates were injection molded from two grades of commercial polypropylene (PP) differing in the molar mass distribution. The mold was mechanically sealed when a desired pressure p i ,max (up to 1560 bar) was reached. Samples were taken from each plate at different distances from the gate and were i…
Conductive polyaniline was synthesized in aqueous 1.0M oxalic acid containing 0.1 M aniline by electrochemical and chemical oxidation and characterized by conductivity, solubility, ultraviolet and infrared spectroscopy, and cyclic voltammetry. The solubility experiments showed that the solubility of oxalic acid-doped…