Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A study has been conducted to determine the frictional characteristics of several fabrics used in apparel. The objective was to generate fabric frictional data to help in developing automated assemblies for fabrics. The results revealed that the coefficients of static and dynamic friction between fabrics decreased as…
Das bekannte, äußerst reaktive [18]Annulen 1 und das hypothetische Isomer 2 sollten sich durch CH 2 ‐ und CHCH‐Gruppen als innere bzw. äußere Brücken stabilisieren lassen. Die entsprechenden Kohlenwasserstoffe 3 bzw. 4 sind nicht bekannt, obwohl sie als Bindeglieder zwischen den nicht‐natürlichen Annulenen und dem Po…
Abstract The clay-mineralogical assemblages of Purbeckian carbonate sediments of the Swiss and French Jura Mountains are often composed of illite and interstratified illite-smectite. These illitic minerals occur mainly in thin layers of green marls which show evidence of subaerial exposure and mark the top of shallowi…
Abstract A kinetic model for the free‐radical‐initiated molecular weight degradation of polypropylene was further developed. The model has a single variable parameter, the initiator efficiency, f. Assumptions were detailed, new comparisons with experimental data presented, and model sensitivity to the value of f evalu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation of a bis-oxo-bridged manganese(III)manganese(IV) intermediate by regulated air oxidation. Synthesis, structure, and properties of dioxobis[tris(aminoethyl)amine]dimanganese(5+) trifluoromethylsulfonateKarl S. Hagen, William H. Armstrong, and Hakon HopeCite this: In…
We present a density-functional theory for the growth of equilibrium nematic and smectic-A wetting layers near free surfaces. In the nematic case our theory predicts complete wetting, with the integrated order parameter diverging logarithmically as one approaches the ordering temperature from the isotropic phase. When…
Abstract Four periods of loess deposition in the Lower Mississippi Valley can be identified on the basis of geochemical and mineralogical criteria, radiocarbon dating, and thermoluminescence dating. These are designated Loess Units 1,2,3, and 4 in order of increasing age. Carbonate‐rich Unit 1 loess comprises more tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSize effects on the .alpha.-.beta. transformation of phthalocyanine crystalsFumio IwatsuCite this: J. Phys. Chem. 1988, 92, 6, 1678–1681Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1 March 1988https://pubs.acs.org/doi/…
A sol-gel process for low-temperature preparation of BaTiO{sub 3} powders is described. Chemical polymerization between barium acetate and titanium(IV) isopropoxide leads to the formation of barium titanate gels. After suitable drying and calcination treatments, the barium titanate gels were converted to BaTiO{sub 3}…
Abstract Polypropylene was degraded by injection of a free‐radical initiator during extrusion. Molecular weight distribution, molecular weight averages, and melt flow index were measured to see the effect of initiator concentration (0.00 to 0.04 wt%), temperature (200 and 220°C), and screw rpm (31 and 44). Initiator c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular photochemical electron transfer. 4. Singlet and triplet mechanisms of electron transfer in a covalently linked porphyrin-amide-quinone moleculeJohn A. Schmidt, Alan R. McIntosh, Alan C. Weedon, James R. Bolton, John S. Connolly, John K. Hurley, and Michael R.…
Evidence of a first-order smectic-A--smectic-${C}^{\mathrm{*}}$ (SmA-Sm${C}^{\mathrm{*}}$) transition is presented. Detailed x-ray studies on 4-(3-methyl-2-chloropentanoyloxy)4'-heptyloxybiphenyl show that the SmA-Sm${C}^{\mathrm{*}}$ transition in this material is characterized by a discontinuous jump in the layer sp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCollapse of poly(ethylene oxide) monolayersDaniel J. Kuzmenka and Steve GranickCite this: Macromolecules 1988, 21, 3, 779–782Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1 March 1988https://pubs.acs.org/doi/10.1021/ma0…
Hysteresis loops and remanent polarization below Tt -70 °C suggest that a ferroelectric phase can be induced in PMN crystals by an electric field parallel to [110], [111], and [001]. This could be corroborated, however, only for the two former cases by optical investigations and X-ray analysis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of aromatic polyamides from N,N'-bis(trimethylsilyl)-substituted aromatic diamines and aromatic diacid chloridesYoshiyuki Oishi, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1988, 21, 3, 547–550Publication Date (Print):March 1, 1988Publication History…
An adiabatic scanning calorimeter has been used to study the thermal behavior of the liquid-crystal cholesteryl nonanoate in a temperature range covering all phase transitions involving the three different blue phases occurring in this substance. Results for the temperature dependence of the enthalpy and the heat capa…
The crystal structure and the magnetic properties are determined for several novel ternary intermetallic compounds of the type RFe/sub 10/T/sub 2/, where R represents Ti, V, Cr, Mo, W, or Si. All these compounds show a strong ferromagnetic behavior, with Curie temperatures in the range 350 K to 600 K. The magnetic and…
The synthesis of a new series of heterocyclic mesogens, the trans-4-alkyloxy-4'-stilbazoles (CnH2n+1OC6H4CH=CHC5H4N), is described and the phase behaviour is reported for all homologues between methyloxy (C1) and dodecyloxy (C12). For n < 3, the compounds are non-mesomorphic; monotropic smectic phases are observed for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonolayer of polystyrene monomolecular particles on a water surface studied by Langmuir-type film balance and transmission electron microscopyJiro KumakiCite this: Macromolecules 1988, 21, 3, 749–755Publication Date (Print):March 1, 1988Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopy of transition region speciesPhilip R. BrooksCite this: Chem. Rev. 1988, 88, 2, 407–428Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1 March 1988https://pubs.acs.org/doi/10.1021/cr00084a004https://doi.org/10…