Materials Literature
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Electron-induced conductivity measurements were performed on polyethylene terephthalate to compare electron and hole contributions to the radiation-induced conductivity. The electron mobility in this material was found to be ≳102 times that of the holes. This result explains an earlier observation that the radiation-i…
A Pb(Fe, Nb)O 3 −Pb(Fe, W)O 3 −Pb(Zn, Nb)O 3 dielectric ceramic fires at temperatures low enough for 100% silver electrodes to be used in multilayer capacitors made with the ceramic. Good dense Pb(Fe, Nb)O 3 , ceramics were obtained by fast, firing, i.e. by using rapid ramp rates and very short firing times. The densi…
Circular dichroism spectra in the ultraviolet region, similar to the spectrum of the collagen helix, were regenerated when various grades of industrial gelatin were allowed to stand at 5°C in a concentration low enough that they did not form gels. Spectrum generation was decreased by an addition of salt or alcohol and…
Abstract Das thermostabile Polyphenylchinoxalin (PCO) haftet nur ungenügend auf Cupfer. Eine Behandlung der Cupferoberfläche im nichtthermischen Plasma einer Hochfrequenz‐Glimmentladung führte zu erheblichen Verbesserungen der Haftfestigkeit. Als besonders geeignet erwiesen sich die vorsichtige Plasmaoxidation der Cup…
Abstract Poly(phenylene ether)s (PPE) are a class of polymers which contain phenolic monomers attached via an ether linkage. Depending upon the monomer types used in the polymerization, a variety of homopolymers and copolymers can be produced. When compounded with polystyrene, these poly(phenylene ether)s combine to f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarization effects upon adsorptive and catalytic properties. 2. Surface electrical conductivity of nickel(II) oxide deposited on lithium niobate (LiNbO3) and its changes upon gas adsorptionYasunobu Inoue, Kazunori Sato, and Shinichi SuzukiCite this: J. Phys. Chem. 1985, 89…
Abstract The Differential Scanning Calorimeter (DSC) was used to discriminate among 25 commercial high density polyethylenes (HDPE) on the basis of their degree of crystallinity and melting temperature. The area under the melting endotherm correlated directly with density and inversely with creep and thermal expansion…
Abstract : A summary of a critical interpretative literature review on product distributions from HMX and RDX decomposition is presented. Principal products formed include N2O, N2, H2CO, CO, CO2, and NO; these and a number of other products such as HCN, HCOOH, NO2(-), NO3(-), hydroxymethyl formamide, H2, and H2O are t…
Abstract Scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS) have been used to examine the nature and quality of wax‐coated RDX crystals. SEM allows a visual assessment of wax‐coated crystals and comparison of different coating processes. XPS has allowed a semiquantitative determination of th…
Abstract The temperature gradients in a Czochralski‐type crystal growth equipment with induction heating can be advantageously influenced by additionally heating the growing crystal and the crucible bottom during the pulling procedure. An experimental solution is presented for both afterheater and bottom heater couple…
Abstract Polysulfides dissolved in non-aqueous solvents react under anaerobic conditions with nitric oxide to yield solutions of nitrosodisulfides. Through the action of NO upon (PNP) 2 S 12 1 [P = P(C 6 H 5 ) 3 ] in acetone a stable compound PNP · SSNO 2 could be obtained. 2 proved to be identical with a red PNP-salt…
Abstract Experimental methods for determining longitudinal crystal moduli of polymers were evaluated in light of recent proceesing methods that produced macroscopic Young's moduli which exceeded ultimate values as found by the x‐ray diffraction method. The spectroscopic techniques of Raman and coherent inelastic neutr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination chemistry and geometries of some 4,4'-bipyridyl-capped porphyrins. Proton- and ligand-induced switching of conformationsRaymond J. Abraham, Philip Leighton, and Jeremy K. M. SandersCite this: J. Am. Chem. Soc. 1985, 107, 12, 3472–3478Publication Date (Print):Jun…
An X-ray structure analysis has been carried out of the monoclinic variety of the zeolite ferrierite from Altoona, Washington. Crystals of this uncommon variety of ferrierite are typically diamond shaped with (100), (201) and dominant (010) faces. The crystal data are a = 18.886(9), b = 14.182(6), C = 7.470(5)A, P = 9…
Abstract So verschiedene Gebiete wie die Stereochemie und die Materialwissenschaften profitieren von detaillierten Untersuchungen des Einflusses, den maßgeschneiderte Inhibitoren auf Wachstum und Auflösung organischer Kristalle ausüben. Bei organischen Kristallen, die in Gegenwart von wachstumshemmenden Additiven ents…
Abstract When virgin polytetrafluoroethylene is heated at intermediate rates, two melting peaks are observed. As the heating rate is increased, the higher‐temperature peak grows at the expense of the lower‐temperature one without any significant change in the total heat of fusion. It is suggested that the higher‐tempe…
The polarization behavior of various pure zinc, Al-Zn, and Zn-Ni coatings was studied to evaluate electrochemical methods for use in testing the performance of such coatings on sheet steel. Behavior in deaerated chloride solutions was found to simulate more nearly the good performance of pure zinc (galvanized) coating…
Magnetic susceptibility and $^{119}\mathrm{Sn}$ M\"ossbauer studies have been carried out on a new series of rare-earth-containing Heusler alloys having the formula ${\mathrm{Pd}}_{2}$RSn (R=Tb--Yb). The Tm and Yb compounds in this series along with Lu, Sc, and Y compounds are superconducting. The magnetic susceptibil…
Abstract Spherical and platy kaolinite crystals were prepared under several hydrothermal conditions. Spherical kaolinite was produced mainly at high solid/water ratio (1/4) and at low temperatures (150°-200°C). Platy kaolinite predominated in products from experiments with intermediate solid/water ratios (1/256-1/16)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-based sensitizers for the formation of singlet oxygen: new studies of polymeric derivatives of rose bengalJerzy Paczkowski and D. C. NeckersCite this: Macromolecules 1985, 18, 6, 1245–1253Publication Date (Print):June 1, 1985Publication History Published online1 May…