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  • 1
    Electronic Resource
    Electronic Resource
    Crystal Structure, Morphology, and Phase Transitions in Aromatic Polyimide Oligomers. 1. Poly(4,4'-oxydiphenylene pyromellitimide) (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 989-996 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00082a016
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  • 2
    Electronic Resource
    Electronic Resource
    Stability Analysis of Local Thinned Shallow Spherical Roof of Oil Storage Tank (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 1463-1470 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The analytical evaluation and finite element methods are used to analyze the criticalstability of the shallow spherical roof of oil storage tank with an axial symmetrical corrosion region.At first, the nonlinear finite element method is adopted to calculate the global critical load of thestorage tank roof, and the local corrosion region is equivalent to a circular corrosion pit with uniformdepth. The results show that the tank wall and inner pressure of the stored oil have slight effects on thestability of the roof. To build the formula of local critical load of the tank roof, the circular corrosionpit is separated from the whole roof and treated as a shallow spherical shell which is elasticallysupported on the rest part of the roof. The equivalent support stiffness is obtained by the deformationcompatibility at the edge of the corrosion pit. The resulted nonlinear stability equation is solved witha modified iteration method to determine the local critical load. The local critical load for anin-service corroded oil tank roof is analyzed by the proposed approach and the results are comparedwith those calculated by the conventional nonlinear finite element method with good agreement andthe geometrical parameter of the corrosion region corresponding to the minimal critical load is 9.5
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.1463.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Cathodic Reduction Processes of SiO〈sub〉2〈/sub〉 Impurity in Magnesium Electrolysis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 439-442 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The cathodic reduction of SiO2 in KCl-CaCl2-NaCl-MgCl2 melt was studied usingtungsten wires as working electrodes. The results of cyclic voltammetry[removed info]square wave voltammetryand chronopotentiometry showed that the cathodic deposition of silicon is a quasi-reversiblediffusion-controlled reaction, followed by a four electrons transfer step. The results of current reversalchronopotentiometry and thermodynamic data showed that both the silicon deposition and the sidereaction between SiO2 and magnesium result in the loss of magnesium and low current efficiency. A35.2% current efficiency was obtained with the content of SiO2 0.2% at 700 [removed info]
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.439.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Thin Yttrium-Stabilized Zirconia Electrolyte Solid Oxide Fuel Cells by Centrifugal Casting (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A centrifugal casting technique was developed for depositing thin 8-mol%-yttrium-stabilized zirconia (YSZ) electrolyte layers on porous NiO-YSZ anode substrates. After the bilayers were cosintered at 1400°C, dense pinhole-free YSZ coatings with thicknesses of ∼25 μm were obtained, while the Ni-YSZ retained porosity. After La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-Ce0.9Gd0.1O1.95 (GDC) or La0.8Sr0.2MnO3 (LSM)-YSZ cathodes were deposited, single SOFCs produced near-theoretical open-circuit voltages and power densities of ∼1 W/cm2 at 800°C. Impedance spectra measured during cell tests showed that polarization resistances accounted for ∼70%–80% of the total cell resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00588.x
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  • 5
    Electronic Resource
    Electronic Resource
    A study on selected properties of La1−xSrxCoO3 and its application in sealed CO2 lasers (1997)
    Springer
    Journal of materials science 32 (1997), S. 203-206 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Samples in the composition series La1−xSrxCoO3 with x=0–0.8 were synthesized, and their crystal structures, conductivities and catalytic activities were studied. When x〈0.6, they have a rhombohedrally distorted perovskite structure. When x=0.3–0.5, their conductivities at room temperature are of the order of 103S m-1. When the temperature is higher than 250°C, the catalytic activities of La1−xSrxCoO3 were very high which reaches a maximum for the sample at x=0.3. Cylindrical samples were made from La1−xSrxCoO3 x=0.3 and used as a cathode in sealed CO2 lasers. Compared to the traditional Ag–Cu alloy cathode, the performance of La0.7Sr0.3CoO3 is better. The maximum output of a 1.0 m length laser tube using the new cathode is 53.1 Wm-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018508123039
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of UV-Irradiation on Anodized Films Formed on Titanium in 0.1M H〈sub〉2〈/sub〉SO〈sub〉4〈/sub〉 Solution (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 208-211 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The titanium anodizations in 0.1 M sulfuric acid solution at different treated potentials andthe effects of UV-irradiation on the anodized films were investigated by spectroscopic ellipsometry(SE), atomic force microscopy (AFM) and scanning tunneling microscopy (STM). The resultsshowed that the thickness of anodized films decreased in air within 280 min over 500 mV vs.Ag/AgCl. The features of parameters tanΨ and cosΔ in SE were in accord with the polarization curveand the thickness of anodized films, respectively. UV-irradiation could greatly decrease the thicknessof the anodized films and provably assisted the reconstruction of anodized titanium films from anamorphous and porous structure to a compact structure. Regardless of UV-irradiation, the cosΔ andtanΨ were still in good agreements with the thickness of anodized films and the polarization curve,respectively. It was also found that UV-irradiation could decrease the surface roughness and make awider atomically flat terrace on the anodized titanium surface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.208.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal structure, morphology, and phase transitions in aromatic polyimide oligomers. 3. Poly(1,4-phenyleneoxy-1,3-phenylene pyromellitimide) (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 2705-2713 
    Details
    ISSN: 0887-6266
    Keywords: crystal unit cell ; morphology ; polyimide ; structure ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An aromatic polyimide oligomer, poly(1,4-phenyleneoxy-1,3-phenylene pyromellitimide) (PMDA-3,4'-ODA), was synthesized from pyromellitic dianhydride (PMDA) and 3,4'-oxydianiline (3,4'-ODA) via a melt-polymerization method. This method permits growth of PMDA-3,4'-ODA lamellar crystals and the crystal structure can be studied via electron diffraction (ED) and wide-angle x-ray diffraction (WAXD) experiments. Our structure analysis indicates that this polyimide possesses a two-chain orthorhombic crystal lattice with dimensions of a = 0.848, b = 0.562, and c = 3.365 nm. It has also been found that poly(amic acid) precursors with little imidization possess the same ab lateral lattice packing, but statistical departure from the ordered packing along the c-direction. Upon increasing the degree of imidization through annealing at elevated temperatures, the order along the c-axis was progressively enhanced. Increasing the annealing temperature caused the dimensions of the a- and the b-axes to expand while the crystal correlation lengths decreased laterally. Simultaneously the dimension of the c-axis shrinks with an increase of the crystal correlation length along the chain direction. Crystal morphological study via transmission electron microscopy (TEM) indicates a mainly lamellar crystal texture with different thicknesses depending upon the polymerization conditions. The end lamellar surface is usually smooth. After annealing at elevated temperatures, the lamellar end surfaces become rough, which may be due to chain motion along the c-axis. The annealed PMDA-3,4'-ODA lamellar crystals still show a large amount of defects. © 1994 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090321616
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  • 8
    Electronic Resource
    Electronic Resource
    Surface functionalization of polymer latex particles. I. Catalytic oxidation of poly(methylstyrene) latex particles in the presence of an anionic surfactant (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 1863-1872 
    Details
    ISSN: 0887-624X
    Keywords: poly(methylstyrene) ; catalytic oxidation ; functionalized latex particles ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A facile synthesis of functionalized poly[3(4)-methylstyrene] (PMS) latex particles containing aldehyde and carboxylic acid groups was achieved via an emulsion polymerization of 3(4)-methylstyrene in the presence of sodium dodecyl sulfonate, followed by an in-situ oxidation catalyzed by copper(II) chloride and t-butyl hydroperoxide (t-BuOOH) in the presence of t-butyl alcohol (t-BuOH). The structure of the anionic surfactant, metal catalyst, organic solvent, oxidant, and their concentrations strongly affected the rate of oxidation and the stability of the emulsion. The average size of the polymer latex particles was found to increase after oxidation, and the polymer was slightly crosslinked. A free-radical mechanism is proposed involving metal-catalyzed decomposition of t-BuOOH and benzylic oxidation. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 1863-1872, 1997
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Surface functionalization of polymer latex particles. II. Catalytic oxidation of poly(methylstyrene) latexes in the presence of cetyltrimethylammonium bromide (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3585-3593 
    Details
    ISSN: 0887-624X
    Keywords: poly(methylstyrene) ; catalytic oxidation ; functional latex particles ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Surface-functionalized cationic poly(methylstyrene) (PMS) latex particles containing aldehyde and carboxylic acid groups were successfully achieved via an emulsion polymerization of 3(4)-methylstyrene in the presence of cetyltrimethylammonium bromide, followed by an in-situ oxidation catalyzed by copper chloride and tert-butyl hydroperoxide (t-BuOOH). Factors such as the type of metal catalyst, oxidant, and their concentration strongly affected the rate of oxidation. Step addition of t-BuOOH resulted in both a higher degree of oxidation and a more uniform distribution of particle size of the functionalized PMS as compared to the batch addition method. The effect of organic solvent was found to be insignificant, and the oxidation could still proceed in its absence. The particle sizes increased significantly during the oxidation but could be controlled by using crosslinked PMS latexes. Finally, the versatility of this oxidation process was demonstrated by oxidation of the polymer with a solid loading as high as 28%. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3585-3593, 1997
    Additional Material: 6 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Thin film melt polymerized single crystals of poly(p-oxybenzoate) (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 81-104 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The morphology of poly(p-oxybenzoate) polymerized from p-acetoxybenzoic acid (pABA) in constrained thin films at temperatures between 130°C and 315°C for various times is described. Polymerization below the melting point of the monomer, 196°C, occurs by a sublimationrecrystallization-melting process, with polymerization occuring in the melt. Lamellar crystals, often bilayered, are found that are ca. 100 Å thick as well as single disclination domains. Electron diffraction patterns indicate the presence of either phase I or II in a given crystal, with the unit cell for phase II being proposed; the molecular axes are normal to the lamellae. Polymerization above 200°C results in holes in the lamellae; it is suggested that polymerization also is in the form of lamellae followed by the hole formation as further reaction occurs in the crystalline state, initial “crystal” growth at all temperatures is in the liquid crystalline state.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950107
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