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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 7 (1951), S. 62-69 
    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: The ultraviolet absorption spectra of fractionated cellulose acetate of varying degrees of polymerisation were measured. In the region between 3000 and 3700 Ä the absorption coefficients were found nearly linear to the wave-length of the light absorbed.The change of the absorption coefficient with increasing wave-length is nearly the same for different degrees of polymerisation.
    Notes: Es wurde das UV-Absorptionsspektrum gereinigter Celluloseacetatfraktionen verschiedenen Polymerisationsgrades bestimmt. Im Bereich von 3000 bis etwa 3700 ÄE nimmt der Absorptionskoeffizient ungefähr linear mit der Wellenlänge des eingestrahlten Lichtes ab.Die Änderung des Absorptionskoeffizienten ist bei Fraktionen verschiedenen Polymerisationsgrades für gleiche Änderungen der Wellenlänge etwa gleich groß.
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 1 (1950), S. 481-487 
    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: 8 Ill.
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  • 3
    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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  • 4
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 8 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 7 (1951), S. 537-541 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymeric phthalyl peroxide was used as an initiator for the polymerization of styrene at 60°C. The peroxide is initially partially insoluble in the monomer, but decomposes and becomes soluble during the course of the polymerization. The intrinsic viscosity of the polymer formed increases with increasing conversion and at about 65-70% conversion becomes higher than would arise from a monoradical-initiated polymerization proceeding at the same rate.
    Additional Material: 1 Tab.
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  • 6
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 7 (1951), S. 658-658 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
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  • 8
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The rates of initiation Ri of polymer chains in styrene and methyl methacrylate have been measured for four different catalysts. The results for styrene at 60°C are: Ri = 1.28 × 10-5[azo]; Ri = 2.96 × 10-6[Bz2O2]; Ri = 6.12 × 10-7[CHP]; Ri = 9.96 × 10-5[BHP]. Azo, Bz2O2, CHP, and BHP refer to 2-azobisisobutyronitrile, benzoyl peroxide, cumene hydroperoxide, and tert-butyl hydroperoxide, respectively. Rates are expressed in moles per liter per second. The corresponding results for methyl methacrylate at 60° are: Ri = 1.42 × 10-5[azo]; Ri = 6.62 × 10-6[Bz2O2]; Ri = 3.92 × 10-7[CHP]; Ri = 7.30 × 10-8[BHP]. Catalyst efficiencies for azo and Bz2O2 are shown to be nearly unity in both monomers. Chain transfer constants were calculated for all catalysts in both monomers. Photopolymerization was shown to proceed via chains growing in one direction only. The polymerizations were all carried out in the pure monomers (bulk polymerization) with exclusion of oxygen and other inhibitors.
    Additional Material: 6 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 543-553 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A discussion of the principles for the extension of the time scale for elastoviscous data by use of experimental information obtained at various temperatures is presented. A quantity k is defined such that stress relaxation curves at all temperatures are identical if plotted versus time divided by k(T). This function k(T) is compared with the function a(T) used by Ferry and by Fox and Flory for other viscoelastic data. In particular, k(T) for polyisobutylene is found to be identical (within experimental error) with a(T) obtained by Fox and Flory from viscosity measurements.The complete composite relaxation curve Er,T(t) for polyisobutylene is constructed from data of Brown and Tobolsky and Andrews and Tobolsky. Er,T(t) is shown to have three regions: a “rubbery region,” and a “glassy region.” This conclusion is reinforced by comparison with data on polymethylmethacrylate. The “rubbery region” is molecular weight dependent, whereas the “transition region” is molecular weight independent and independent of the presence of a small concentration of cross links.Simple empirical functions are given for Er,T(t) and the corresponding distributions of relaxation times are also presented.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 9 (1952), S. 575-579 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
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