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  • 1
    Electronic Resource
    Electronic Resource
    Durch die Chelatkomplexe von Übergangsmetallen ausgelöste radikalische Reaktionen. 14. Mitt. Cu(II)-2-Aminoäthanolat, ein selektiver Initiator für die Polymerisation von Vinylmonomeren (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 715-715 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01784506
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Eigenschaften von Elektrolyt-Filmen bei der atmosphärischen Korrosion (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 16-21 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Properties of electrolyte films formed through atmospheric corrosionAn investigation has been carried out into the composition of the electrolyte films which are formed on non-metallic materials (glass) as well as on metals (Cu, Zn, Fe) in an atmosphere containing SO2. Fresh as well as pre-corroded specimen were used. It was found that the SO2 absorbed in the solution is very rapidly oxidized into SO42- if the electrolyte film contains dissolved particles of the corrosion products. With 1 to 55 ppm SO2 in the atmosphere, the change in the pH value of the electrolyte is but small and does not vary with the SO2 partial pressure.
    Notes: Die Zusammensetzung der auf nichtmetallischen Materialien (Glas) sowie auf Metallen (Cu, Zn, Fe) an SO2-haltiger Atmosphäre entstehenden Elektrolytfilme wurde untersucht, wobei sowohl frische als auch vorkorrodierte Proben verwendet wurden. Dabei stellte sich heraus, daß das in der Lösung aufgenommene SO2 sehr rasch zu SO42- oxydiert wird, wenn der Elektrolytfilm gelöste Anteile aus den Korrosionsprodukten enthält. Der pH-Wert des Elektrolyten ändert sich bei 1 bis 55 ppm SO2 in der Atmosphäre nur wenig und nicht entsprechend dem SO2-Partialdruck.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19700210104
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  • 3
    Electronic Resource
    Electronic Resource
    Eine universelle Einrichtung für die Prüfung der atmosphärischen Korrosion von Metallen und Schutzüberzügen (1975)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 118-123 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Universal accelerated weathering cabinet for weathering tests of metals and protective coatingsThe authors have developed a accelerated weathering cabinet with visual observation of specimens during the test. The temperature can be controlled between 0 and 50°C by a current of warm air and a thermostat, while a humidification device enables the relative humidity to be controlled between 50 and 95%. Aggressive additions such as sulphur dioxide, aerosols, salt spray etc. are added through a spray system. Sulphur dioxide concentrations can be controlled between 0.1 and 10 ppm and 1 to 100 ppm respectively.
    Notes: Die Verfasser haben einen Klimaprüfschrank entwickelt, der die visuelle Beobachtung der Proben während er Versuche ermöglicht. Mit Hilfe eines Thermostatsystems kann die Temperatur durch einen Luftstrom Zwischen 0 und 50°C reguliert werden; ein Befeuchtungsgerät gestattet die Einstellung der relativen Feuchtigkeit im Bereich 50 bis 95%. Der Zusatz von aggressive Medien, insbesondere Schwefeldioxid, Aerosolen, Salzsprühnebel usw. erfolgt durch eine Sprühvorrichtung; der Schwefeldioxidgehalt kann dabei zwischen 0,1 und 10 ppm sowie 1 und 100 ppm eingestellt werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19750260205
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  • 4
    Electronic Resource
    Electronic Resource
    Atmosphärische Korrosion des Eisens bei periodischer Befeuchtung (1973)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 684-691 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Atmospheric corrosion of iron with periodic moisteningPeriodic moistening has a considerable bearing on the model of the corrosion of iron. The frequency of condensation is much more important than the duration of the existence of a condensed layer. Immediately upon condensation a steep increase of the corrosion rate is found. These periods of condensation thus control the rate and the intensity of the attack. The results of measurements concerning the dependence on time, and of radiochemical experiments (concerning the behaviour of sulphate ions) allow the conclusion that condensation intervenes in the reaction system and affects the availability of sulphate ions at the interphase as well as the function of water. In this context the difference between adsorbed and condensed aqueous layers should be taken into consideration. It is suggested to develop a numerical index allowing the duration of accelerated corrosion to be determined in terms of the frequency of condensations.
    Notes: Periodische Befeuchtungen beeinflussen das Modell der Eisenkorrosion beträchtlich. Dabei ist die Häufigkeit der Kondensationen wesentlich einflußreicher als die Dauer der Existenz einer kondensierten Schicht. Unmittelbar nach der Kondensation ist ein starker Anstieg der Korrosionsgeschwindigkeit festzustellen. Diese Kondensationsperioden bestimmen daher die Geschwindigkeit und die Stärke des Angriffs. Auf der Grundlage der Messungen über die Zeitabhängigkeit und auf der Basis von radiochemischen Untersuchungen (über das Verhalten der Sulfationen) kann man schließen, daß die Kondensation in das Reaktionssystem eingreift, und zwar hinsichtlich der Verfügbarkeit der Sulfationen an der Grenzfläche und hinsichtlich der Funktion des Wassers. Dabei ist auch der Unterschied zwischen adsorbierten und kondensierten Wasserschichten zu berücksichtigen. Es wird vorgeschlagen, eine Indexzahl zu entwickeln, welche die Bestimmung der Dauer der beschleunigten Korrosion in Abhängigkeit von der Häufigkeit der Kondensation ermöglicht.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19730240803
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  • 5
    Electronic Resource
    Electronic Resource
    Metal compounds in free-radical processes. III. Polymerization of acrylonitrile initiated by copper (II) nitrate in presence or absence of triphenylphosphineFor Part II, see Horanská and Bartoň.1 (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 2273-2282 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bulk polymerization of acrylonitrile (AN) initiated by copper (II) nitrate, Cu(II), in the absence of light has been studied. The rate of the AN polymerization may be expressed in the Cu(II) concentration range from 5 × 10-4 to 1 × 10-1 mole 1.-1 by the equation, Rp = k5[Cu(II)]0.68, where k5 = KAN[AN]/(1 + KAN[AN]). From the spectrophotometric measurements the values of 0.70 l./mole and 0.08 l, mole were obtained for the equilibrium constant at 20 and 60°C, respectively, KAN = [C]/[AN]-[Cu(II)], corresponding to the formation of the complex C from acrylonitrile and copper (II) nitrate. An addition of triphenylphosphine (C6H5)3P into the polymerization system reduces Rp, and no polymerization takes place at all provided [(C6H5)3P]/[Cu-(II)] ≧ 5. The retardation effect of (C6H5)3P on the polymerization of AN initiated by Cu(II) is attributed to a competitive reaction of Cu(II) with (C6H5)3P in which Cu(II) is reduced and the product of this reduction CuNO3·2(C6H5)3P is inactive with respect to the polymerization of AN.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170121009
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  • 6
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    Durch die Chelatkomplexe von Übergangsmetallen ausgelöste radikalische Reaktionen. 14. Mitt. Cu(II)-2-Aminoäthanolat, ein selektiver Initiator für die Polymerisation von Vinylmonomeren (1978)
    Springer
    Details
    Publication Date: 1978-07-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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