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  • Chemistry  (40)
  • seismic processing/methodology  (4)
  • STRUCTURAL MECHANICS  (3)
  • 11
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 16 (1990), S. 265-270 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Ti5Ta alloy shows interesting corrosion behaviour and is becoming technologically important, e.g. for chemical plant construction. Welding and further mechanical tests gave good mechanical properties. Therefore, the corrosion of this alloy was studied in comparison with the corrosion of unalloyed Ti and Ta. The samples were corroded for up to 24 days in hot 67.5% nitric acid.The resulting surface layers were investigated with SEM, transmission electron microscopy (TEM), energy dispersive x-ray microanalyses (EDX), AES and sputtered neutral mass spectrometry (SNMS). Under these conditions, the oxide growth seems to be dependent on the orientation of the crystallites at the surface, which was not observed under milder attack. When Ti5Ta samples were immersed for 5 days in boiling HNO3, the oxide layer was ∼300 nm thick and a particular crack pattern developed on some grains during drying in air at room temperature. This was observed only for oxide layers thicker than 300 nm.After corroding Ti5Ta in boiling HNO3 we observed a TaTi atomic ratio of up to 1:1 using ESCA and up to 5 μm thick Ta oxide-rich scales. The selected area diffraction pattern in the TEM indicates that the oxide film may contain mixed Ti/Ta oxides. The extraordinary Ta oxide enrichment, which is due to the selective dissolution process of Ti, is believed to cause the good corrosion resistance of the alloy. It was not observed after heat treatment in air up to 800 °C or after corrosion tests in HNO3 at room temperature.
    Additional Material: 8 Ill.
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  • 12
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 155-162 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A model system was developed to study the influence of the rubber formulation and/or the aging conditions on the adhesion between brass and rubber. The bonding compounds were vulcanized on thin, homogeneous brass layers that had been prepared by sputtering onto special polymeric substrates; some of these compounds were steam-aged under controlled conditions subsequently. After the separation of the polymeric film, combined analytical electron microscopy (transmission electron microscopy/energy dispersive spectroscopy; TEM/EDS) and sputter neutral mass spectrometry (SNMS) analyses were performed. While the TEM/EDS studies offer a detailed insight into the morphological structure of the interphase, the SNMS depth profiles allow a rapid and reliable differentiation between various rubber formulations. With these model samples the beneficial effect of boric acid esters on the adhesion of cobalt-containing bonding compounds, which is observed in a typical short-term adhesion test after steam-aging, can be explained: boric acid esters act with cobalt salts as corrosion inhibitors for brass, preventing the growth of a thick intermediate ZnO/Zn (OH)2 layer that is the starting point for delaminations.
    Additional Material: 7 Ill.
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 149 (1869), S. 70-75 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 14
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 151 (1869), S. 213-215 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The results obtained in investigating the long chain branching of high pressure polyethylene (LDPE) and emulsion polybutadiene (PB-E) are provided. Besides 13C NMR data measured in the low and high field region (with hydrated PB-E) comparative values of molecule contraction in solution are considered. The change of the molecular weight distribution and the relationships between molecular weight and intrinsic viscosity in dependence on conversion in the emulsion polymerization of butadiene was investigated. The data required for determining the contraction factor were obtained by combining gel permeation chromatography and solution viscosity measurements. The differences of the results are discussed with respect to their causes.
    Notes: Es wird über Ergebnisse von Langkettenverzweigungsanalysen am Hochdruckpolyethylen (PE-LD) und Emulsionspolybutadien (PB-E) berichtet. Die Ergebnisse aus der 13C-NMR-Spektroskopie im niederen und hohen Feldbereich (am hydrierten PB-E) werden mit Informationen aus den Untersuchungen zur Molekülkontraktion in Lösung verglichen. Die änderungen der Molmassenverteilung sowie die Zusammenhänge zwischen Molmasse und Grenzviskosität als Funktion des Umsatzes bei der Emulsionspolymerisation des Butadiens wurden untersucht. Die Daten zur Bestimmung des Kontraktionsfaktors g′GPC wurden aus der Kombination von Gelpermeationschromatographie und Viskositätsmessungen erhalten. Die Ursachen für die unterschiedlichen Resultate werden diskutiert.
    Additional Material: 7 Ill.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 864-865 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
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  • 17
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 44 (1972), S. 1309-1312 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden Meßergebnisse der scheinbaren radialen Wärmeleitzahlen mitgeteilt. Ausgehend von differenziellen Wärmebilanzen werden mathematische Zusammenhänge entwickelt, aus denen in Zusammenhang mit den experimentellen Ergebnissen hervorgeht, daß die scheinbare Wärmeleitzahl in radialer Richtung einer gasdurchströmten Schüttung in erster Näherung eine Funktion der Massenstromdichten sowie der spezifischen Wärme des Gases darstellt. Die Wärmeleitzahlen wurden aus an einer Versuchsanlage mit 80 mm lichter Weite und ca. 1800 mm Länge gemessenen Temperatur-Quer- und Längs-Profilen errechnet. Die Versuche wurden für Wärmestrom-richtung von innen nach außen und umgekehrt durchgeführt und die Ergebnisse an einem Rohr mit kleinem Durchmesser überprüft.
    Additional Material: 6 Ill.
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  • 18
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 49 (1961), S. 238-240 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
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  • 19
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 91 (1966), S. 212-230 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2,3,6-Glucose-tricarbanilate prepared by degradation of cellulosetricarbanilate in 1-hydroxy-2-methoxy-ethane in presence of p-toluenesulfonic acid was condensed with phosphorpentoxide in a mixture of chloroform-dimethyl sulfoxide. Light scattering measurements gave degrees of polymerization up to 640. Contrarily to cellulose- and amylosetricarbanilates there was no definite relation between the STAUDINGER-Indices and molecular weights. Also no angular dependence of the scattered light was found. The products therefore are branched. The side chains are bound to the carbanilate groups, for after alkaline saponification of the polyglucosans the degrees of polymerization decrease to about 60. Degradation experiments with α-amylase and cellulase, optical rotation in tetraethylammoniumhydroxide and viscosity measurements of polyglucosans compared with those of different cellodextrins showed clearly that only 1,4-β-glucosidic linkages are present in the synthetic polysaccharides and that the products are not branched.
    Notes: 2,3,6-Glucosetricarbanilat  -  aus Cellulosetricarbanilat durch Alkoholyse in 1-Hydroxy-2-methoxy-äthan in Gegenwart von p-Toluolsulfosäure hergestellt  -  wurde in Chloroform/Dimethylsulfoxid durch Phosphorpentoxid kondensiert. Streulichtmessungen der Polykondensate ergaben Polymerisationsgrade bis 640. Zum Unterschied von Cellulose- und Amylosetricarbanilaten wurde keine eindeutige Beziehung zwischen STAUDINGER-Indices und Molekulargewichten gefunden. Die Streulichtintensität ergab keine Winkelabhängigkeit. Die Produkte müssen daher verzweigt sein. Die Seitenketten sind an die Carbanilatgruppen gebunden, denn nach alkalischer Verseifung lagen die Polymerisationsgrade bei ca. 60. Aus Abbauversuchen mit α-Amylase und Cellulase, Drehwerten in Tetraäthylammoniumhydroxid und vergleichenden Viskositätsmessungen an den Polyglucosanen und verschiendenen Cellodextrinen geht hervor, daß nur 1,4-β-glucosidische Bindungen in den synthetischen Polysacchariden vorliegen und daß die Produkte unverzweigt sind.
    Additional Material: 2 Ill.
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 416 (1975), S. 256-262 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Vibrational Spectra of Trioxodifluoromolybdates(NH4)2MoO3F2 crystallizes in the space group P212121 with a = 6.361(1); b = 7.488(1), c = 11.103(2) Å and Z = 4. According to a threedimensional X-ray structure analysis (596 reflections, R = 0.066) the polymer MoO3F22--ion consists of planar cis-dioxodifluoro units which are linked into an infinite chain by alternating short (1.880 Å) and long (2.007 Å) Mo—O bonds. The vibrational spectra of (NH4)2MoO3F2 and K2MoO3F2. H2O are discussed.
    Notes: (NH4)2MoO3F2 kristallisiert in der Raumgruppe P212121 mit a = 6,361(1) b = 7,488(1), c = 11,103(2) Å und Z = 4. Nach dem Ergebnis einer dreidimensionalen Röntgenstrukturanalyse (596 Reflexe, R = 0,066) liegen im MoO3F22--Ion planare cis-dioxodifluoro- Gruppen vor, die senkrecht dazu über alternierend kurze (1,880 Å) und lange (2,007 Å) Mo-O-Brückenbindungen zu unendlichen Ketten verknüpft sind. Die Schwingungsspektren von (NH4)2MoO3F2 und K2MoO3F2. H2O wurden registriert und zugeordnet.
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