Materials Literature
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Ferroelectric properties for the copolymers of acrylonitrile and allylcyanide were investigated in a temperature range of 20°C to 180°C. The copolymers containing a certain fraction (35 mol%) of allylcyanide showed a dielectric anomaly with the peak due to the structural change of paracrystal around 120°C, which is ab…
Abstract Es wird ein neuer Nickel‐Chrom‐Molybdän‐Werkstoff, Nicrofer 5923 hMo, Leigierung 59 (Werkstoff‐Nr. 2.4605) vorgestellt, der für härteste Korrosionsbeanspruchungen entwickelt wurde, wie sie in der Chemischen Industrie und in heutigen Umweltschutzsystemen auftreten. Diese Legierung, die im wesentlichen aus 59%…
Abstract The existing models of the foaming process in reaction injection molding are inadequate for predicting the bubble‐size distribution, which influences many properties of interest. This work attempts to develop a model for the bubble‐size distribution under conditions of free rise. The population balance equati…
A study has been done of the effect of neutral salts (NaCl and CaCl2) on the mechanism of type I collagen triple helix folding and unfolding in concentrated acetic acid solutions (2-8.8 M). It is shown that in these conditions, thermoabsorption and secondary structure change in heated solutions proceed in two consecut…
Abstract Brittle failure, a significant design issue for plastic components subject to impact loads, is especially catastrophic when the material is normally ductile. Such behavior is not adequately understood relative to the micromechanisms, controlling parameters, and design consequences in plastics. Previous work h…
Galvanic corrosion between dissimilar materials was investigated using laboratory simulations of oil/gas production environments. Galvanic corrosion of materials used in production equipment (4130, 9 Cr, 13 Cr, 2205, 718, 825, NIC 32, NIC 42, SM 2550, Beta-C Ti, C-276, 925) was studied in corrosive environments, which…
The study examines the effect which the composition of hot‐pressed electroconductive ceramics has on their structure, mechanical properties, and oxidation behavior, for ceramics of the type AIN–Al 2 O 3 –42 wt% TiN, differing in the AIN/Al 2 O 3 ratio. The results are physico‐mechanical property data, including densit…
A series of cellobiose octaalkanoates, Cel-II-n (n is the carbon number of the alkyl chain), with n = 7–14 were prepared and their mesogenic properties examined by differential scanning calorimetry, optical polarizing microscopy and X-ray diffraction. All of these compounds form enantiotropic discotic columnar phases,…
Having generated and identified a carbon thirteen NMR signal arising exclusively from PC chains the PC/PS interface, we can now perform NMR relaxation experiments to characterize the microscopic dynamics of these chains. A difference pulse sequence is used which includes a period for carbon dephasing under the influen…
Abstract In the copper deposit of Salobo 3A (Brazil), nontronite-like clay samples were found at the bottom of the weathering blanket. Samples were fractionated first by sedimentation and then by a HGMS method. From XRD data, it was found that the samples are essentially smectite with kaolinite in very small quantitie…
Cation order among the octahedral sites of three polycristalline 29 Si-enriched garnet s on the enstatite-pyrope join has been examined. These samples were synthsized at 17.7GPa and 2000°C. All three samples yielded 29 Si NMR peaks in the chemical shift range of -68 to -90ppm, caused by 4 Si and between -195.6 and -19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntiplasticization and abrasion resistance of polycarbonates in the charge-transport layer of an organic photoconductorR. E. Cais, M. Nozomi, M. Kawai, and A. MiyakeCite this: Macromolecules 1992, 25, 18, 4588–4596Publication Date (Print):August 1, 1992Publication History Pu…
Abstract Hydrothermal tobelitic phyllosilicates modeled as ISII (R3) ordering with a minimum of 2–3% and a maximum of 6–8% interstratified smectite occur in veins and as replacement of fossils in hydrothermally altered black shale. These heavy metal-rich phyllosilicate veins formed during a Mesozoic-aged, regional-sca…
The electromigration reliability of Cu interconnects has been studied under DC, pulse-DC, and bipolar current stressing conditions. Electroless plating was used to selectively deposit Cu in oxide trenches by using Pd silicide as a catalytic layer at the bottom of the trenches to initiate copper deposition. The DC and…
Polycondensation or step-growth polymerization systems differ from addition polymerization systems in that polymer growth occurs not just from monomer addition but from polymer-polymer reactions. Also, the reactions occurring during polycondensation often cause the production of a small molecule byproduct called a con…
Data from time-resolved optical emission spectroscopy (TROES) are presented from experiments on plasma modulation in a typical parallel-plate reactor used for the deposition of amorphous-silicon-based materials. The SiH 4 -H 2 , GeH 4 , SiF 4 and SiF 4 -H 2 systems have been investigated by varying the modulation para…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and x-ray characterization of the neutral organometallic gold cluster [Au10(C6F5)4(PPh3)5]Antonio Laguna, Mariano Laguna, M. Concepcion Gimeno, and Peter G. JonesCite this: Organometallics 1992, 11, 8, 2759–2760Publication Date (Print):August 1, 1992Publication His…
Abstract This paper aims at characterizing the morphology, texture, and microstructure of three hydrated kaolin rich clays (f < 0.2 μ m) from volcanic soils. These clays represent a weathering sequence in which CEC, halloysite content with respect to kaolinite, as well as smectite content in the halloysite-smectite…
A new approach based on the partial coherent theory of light is introduced to predict the radiative properties of a thin film. General expressions obtained for the normal reflectance and transmittance of a thin film not only degenerate into the limiting results of the wave and the geometric optics in the coherent and…
Crystal data for polymorph I are:Pn2I1a, a=14.474, b=21.953, c=8.203 A, T=294K, R=0.047. The structure of polymorph II space groupe Pbca was reported earlier. A phase transition occuring at 422-423 K has been detected.