Materials Literature
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Abstract Blends of an aromatic polyethersulfone (commercial name Victrex) and a polyimide (commercial name Matrimid 5218), the condensation product of 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride and 5(6)‐amino‐1‐(4′‐aminophenyl)‐1,3,3′‐trimethylindane, were studied by differential scanning calorimetry, dynamic…
Low-energy electron diffraction (LEED) is a well established technique for evaluation of the surface atom arrangement. The information is derived from the elastically scattered electrons. Usually the thermal diffuse background between diffraction spots is assumed to be constant and subtracted as a constant. For spot p…
Analyses of unprotected loss-of-flow accidents for medium-size cores of current liquid-metal fast breeder reactors have shown that the accident proceeds into a transition phase where further meltdown is accompanied by recriticalities and secondary excursions. Assuming very pessimistic conditions concerning fuel discha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures in solution and in the solid state of the complexes of lanthanum(III) with 1,10-phenanthroline. X-ray crystallographic and proton, carbon-13, oxygen-17 and lanthanum-139 solution NMR studiesMonique Frechette, Ian R. Butler, Rosemary Hynes, and Christian DetellierC…
An extensive statistical accelerated aging experiment, involving a total of 180 unfilled type epoxy specimens, has been conducted to determine the number of voltage surges required to initiate electrical trees under various magnitudes, surge repetition rates, and polarity conditions. The specimens were tested one at a…
Two groups of weft-knitted fabrics, single and double knits, were selected to represent typical summer T-shirts and winter sportswear such as sweaters and other knit tops. Two kinds of analyses were performed: subjective overall handle and primary sensory factors were evaluated using a 99 point polar-word scale, and p…
The local rise of lattice temperature in n-MOSFETs is analyzed by the energy shift of the silicon optical phonon using Raman spectroscopy with submicrometer spatial resolution. When operating the devices in saturation, a source-drain temperature asymmetry is observed corresponding to the heat dissipation profile that…
Surfaces of implantable and blood contact-devices accumulate adsorbed and denatured proteins. This anomalous layer of proteins may help trigger unwanted events such as activation of coagulation systems and, perhaps, chronic inflammation. Because, in many experimental systems, the purposeful coating of surfaces with al…
Terphenyls with two lateral ortho-fluoro-substituents have proved to be excellent host materials for ferroelectric (SC∗) mixtures. The compounds reported here are biphenyls with the same arrangement of lateral substituents but with a trans-4-alkylcyclohexylethyl moiety as one of the terminal substituents. Such three r…
A method to determine the thermal diffusivity in thin films, based on the measurement and analysis of thermal waves induced by a modulated infrared laser, is demonstrated. A nearly exact mathematical description, independent of the film geometry and including surface heat losses, is presented. It is shown that the in-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA quantitative scale for the oxidizing strength of oxidative fluorinatorsKarl O. Christe and David A. DixonCite this: J. Am. Chem. Soc. 1992, 114, 8, 2978–2985Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992ht…
In this work recycled polyolefins from municipal solid wastes, composed of 95% polyethylene (PE) and 5% polypropylene (PP), are reinforced with chemico thermomechanical pulp fiber, and the resulting material is formed by compression and in jection molding. Tensile properties are presented as function of fiber concentr…
A common feature of stable quasicrystals, high-${\mathit{T}}_{\mathit{C}}$ ferroelectrics, and high-${\mathit{T}}_{\mathit{c}}$ superconductors is that their unusual physical properties are correlated with characteristic crystal stuctures that are often vicinal to structural instabilities. We describe a statistically…
Subcritical crack growth of macroscopic cracks in two Al 2 O 3 ceramics is investigated with single‐edge‐notched bending specimens under constant load. The resulting v ‐ K I ‐curves are in complete contrast to the behavior of natural cracks. In spite of the monotonic increase of the externally applied stress intensity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular origin of supramolecular self-assembling in statistical copolymersChristopher Hilger, Martin Draeger, and Reimund StadlerCite this: Macromolecules 1992, 25, 9, 2498–2501Publication Date (Print):April 27, 1992Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of the galloaluminate GaO4Al12(OH)24(H2O)127+ polyoxocation by MAS NMR and infrared spectroscopies and powder x-ray diffractionSusan M. Bradley, Ronald A. Kydd, and Colin A. FyfeCite this: Inorg. Chem. 1992, 31, 7, 1181–1185Publication Date (Print):April 1,…
Electrochemically prepared poly(3‐methylthiophene) films on both platinum and 430 stainless steel (430SS) rotating disk electrodes (RDEs) were characterized for various galvanostatic electropolymerization conditions. Both applied current density and rotation rate affected subsequent redox capacity, polarization and se…
Collagenous peptides containing the Ehrlich chromogen (EC) were selectively isolated from a tryptic digest of bovine tendon by coupling to a diazotized polyacrylamide support. The isolated p-phenol-azo-EC peptides were purified and characterized by amino acid and sequence analyses. EC occurred in stoichiometric amount…
Model experiments have been conducted on a series of alumina samples in which the microstructures have been tailored to conform to the classical configuratins depicted in the models of final‐stage sintering. Simultaneous measurements of sintered density, grain size, pore number density, and pore size distribution were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA simple, efficient route to a .mu.6-oxo-centered hexanuclear iron(III) alkoxide complex: preparation and structure of Na2Fe6O(OCH3)18.cntdot.6CH3OHKaspar Hegetschweiler, Helmut W. Schmalle, Hans M. Streit, Volker Gramlich, Hans Ulrich Hund, and Isidor ErniCite this: Inorg.…