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  • 11
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 1 (1950), S. 76-81 
    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
    Additional Material: 3 Ill.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 1 (1950), S. 297-299 
    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
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 2 (1951), S. 212-221 
    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: Wetting of metals by waterIn the following own experiments and such of other authors are discussed concerning the balances of wetting of air, water and metal,  -  the explanation of which has hardly been tried so far  - , as they appear to be of importance for the basic research of the corrosion of metals. In view of the fact that their methodic has haidty been used in corrosion research, only the basic trials are demonstrated.Prior to the careful measurings of Bartell and Cardwell only more informative researches on the wetting of metals by water were made by older authors. This article, therefore, starts from the experiments on gold and silver made by Bartell and Cardwell. Own observations on mercury follow, which admit certain qualitative statements on account of the knowledge of the respective surface tension of liquid mercury. As regards other metals, among which platinum shows particularly remarkable results, only preliminary qualitative results can be discussed. They lead to some consequences concerning the question of the sort of combining power of oxygen of air to the surfaces of metals.A survey is given on the indirectly gained values of the surface tension of solid metals. These values yield together with the heats of adsorption obtained on metal catalysers a comparative measure for the different adsorption power on metal surfaces.The conclusions from the observed rivalry between the wetting by water and the adsorption of air are compared with the results of various authors on the adsorption of gases or aequous mediums on metal surfaces. Finally a hypothesis is proposed for the traceadhesion of water (Wasscr-Haftspur-Erscheinung).
    Notes: Im folgenden werden fremde und eigene Untersuchungen über Benetzungsgleichgewichte des Stofftrios: Luft, Wasser, Metall, deren Ausdeutung bisher kaum versucht wurde, zusammenfassend diskutiert, da sie für die Grundlagenforschung der Metallkorrosion von Bedeutung sein dürften. Mit Rücksicht darauf, daß ihre Methodik in der Korrosionsforschung bisher kaum Anwendung fand, werden zunächst die Verfahrens-Grund-Lagen dargelegt.Vor den sorgfältigen Messungen von Bartell und Cardwell wurden nur seitens älterer Autoren mehr orientierende Untersuchungen über die Benetzung von Metallen durch Wasser veröffentlicht. Deshalb wird von den Untersuchungen Bartells und Cardwells an Gold und Silber ausgegangen. Hieran schließen sich eigene Beobachtungen an Quecksilber, welche dank der Kenntnis der in Frage kommenden Grenzflächentensionen des flüssigen Quecksilbers gleichfalls noch gewisse quantitative Aussagen ermöglichen. Uber andere Metalle, von denen Platin besonders bemerkenswerte Erscheinungen lieferte, können nur vorläufige, qualitative Ergebnisse besprochen werden; auch ergeben sich einige Folgerungen zur Frage der Bindungsart von Luftsauerstoff an Metalloberflächen.Nach einem Überblick über indirekt erschlossene Werte der Oberflächentension fester Metalle, die neben den an Metallkatalysatoren erschlossenen Adsorptionswärmen ein Vergleichsmaß für die unterschiedliche „Adsorptionskraft“ von Metalloberflächen ergibt, werden dic Schlußfolgerungen aus der zu beobachtenden Konkurrenz von Wasserbenetzung und Luftadsorption mit Ergebnissen verschiedener Autoren über Adsorption an Metallflächen aus gasförmigem oder wäßrigem Medium verglichen. Schließlich wird für die vom Verfasser früher beschriebene Wasserhaftspurerscheinung eine Hypothese vorgeschlagen.
    Additional Material: 2 Ill.
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  • 14
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 5 (1950), S. 709-718 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Ill.
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  • 15
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 6 (1951), S. 7-11 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: (1) A technique has been described for the short-path distillation of substances from rubber. It has been found that sulfur, TMTM, TMTD, ZnDMDC, phenyl-beta-naphthylamine, and palmitic acid are recoverable by this procedure. (2) The conversion of zinc compounds such as zinc oxide and zinc palmitate to ZnDMDC in rubber by treatment first with CS2 and then with dimethylamine has been studied. (3) The volatilization of zinc from vulcanizates after conversion to ZnDMDC has been shown to occur without devulcanization.
    Additional Material: 1 Ill.
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  • 16
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 6 (1951), S. 13-20 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: (1) The reaction of rubber with zinc palmitate was found to liberate palmitic acid at low pressures, thus revealing that rubber is acidic. (2) The reaction of zinc oxide with palmitic acid in toluene solution was enhanced by the presence of water. (3) The small increase in the nitrogen content of rubber caused by its reaction with TMTD was equivalent to the palmitic acid liberated by the zinc palmitate reaction. (4) The use of TMTD as a reagent for organic acids has been studied and found to convert carboxyl groups into dimethylamide groups. This result suggests that the acidic nature of rubber is due to carboxyl groups in the rubber molecule, a suggestion which is compatible with the nearly complete removal of zinc from the TMTD vulcanizate by the zinc removal technique.
    Additional Material: 2 Ill.
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  • 17
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 6 (1951), S. 39-44 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A brief discussion of the importance of the transfer step and its effect in the pyrolysis of polyethylene is given. In this case the removal, by molecular distillation, of smaller species from the reacting mixture modifies the kinetics. The molecular weight decreases less rapidly and tends to a limiting value depending on the maximum size of the evaporating molecules. The number distribution of the latter is, in a first approximation, independent of their size. The pertinent expressions are presented and the general solution of the rate equations which can be used to obtain higher approximations is given.
    Additional Material: 1 Ill.
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  • 18
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 6 (1951), S. 177-187 
    ISSN: 0022-3832
    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
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The rheological properties of polystyrene have been studied between 90 and 240°C. as a function of molecular weight. Three different methods have been used to obtain the data: rotational viscometer, extrusion-type capillary viscometer, and tensile creep measurements. It has been shown that the nonrecoverable (viscous) deformation is a function of molecular weight whereas the recoverable deformations are, within the investigated molecular weight range, practically independent of chain length. An explanation of this observation is suggested, based on the assumption of a labile network structure, which explains also the effect of “previous history” on the recoverable deformations. The temperature dependence of the recoverable and nonrecoverable deformations is shown to be very similar. Experimental evidence is presented to show that the dependence of the viscosity on shear stress (or rate of shear) is not a simple power relationship but is of the sigmoidal type. It is shown that the creep or compliance function a few degrees below the second-order transition point does not depend on the weight- or number average molecular weight.
    Additional Material: 16 Ill.
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  • 20
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Two new principles are discussed by which polymerization may be initiated electrolytically. One of these methods, the continuous electrolytic formation of the activator in a redox activation polymerization system, under various conditions, has been used successfully in the polymerization of acrylonitrile, but not of isoprene or styrene. The second method, based on the formation of free radicals in the electrolytic reduction of perdioxy compounds, has been tested under a limited number of conditions without significant success. Emulsion systems also have been employed in this research and the results are discussed.
    Additional Material: 8 Ill.
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