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  • Polymer and Materials Science  (36)
  • unknown  (11)
  • Aircraft Stability and Control  (2)
  • GENERAL
  • 1955-1959  (39)
  • 1945-1949  (11)
  • 1956  (39)
  • 1949  (11)
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  • 1955-1959  (39)
  • 1945-1949  (11)
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  • 1
    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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  • 2
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 705-708 
    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: The results of the corrosion tests of cathodically protected iron specimens in aired and not aired soils were published in article I. This paper is a report on further corrosion tests on cathodically protected iron specimens in soils which have been carried out to explain the influence of the soil water to soil air ratio. The corrosion of the protected specimens decreased when the soil had reached its water saturation limit as it should have been expected. On basis of these investigations you could get quantitative and reliable datas of the effectiveness of the cathodic protection on the corrosion of the cathodic protection on the corrosion of the protected metal in dependence of the soil water to soil air ratio which characterizes the aggressiveness of soils. The results of these investigations could be used also to put up general corrosion charts for materials to be protected by cathodic protection.
    Notes: Nachdem über die Ergebnisse der mit kathodisch geschützten Eisenproben in belüfteten und unbelüfteten Böden durchgeführten Korrosionsversuche bereits berichtet wurde (Mitteilung I), wird in der vorliegenden Arbeit über weitere Korrosionsversuche berichtet, die mit kathodisch geschütztem Eisen im Erdreich zur Klärung des Einflusses des W-Bd-Verhältnisses durchgeführt wurden. Wie zu erwarten war, wurde der Angriff der geschützten Probe verringert, wenn der Boden die Sättigungsgrenze an Wasser erreicht hatte. Auf Grund der durchgeführten Versuche können quantitative, zuverlässige Aussagen über die Wirkung des kathodischen Schutzes auf den Korrosionsablauf des geschützten Metalls in Abhängigkeit vom W-Bd-Verhältniswert, der für die Aggressivität des Bodens maßgebend ist, gemacht und zur Aufstellung allgemeiner Korrosionsschemen für einen kathodisch zu schützenden Werkstoff herangezogen werden.
    Additional Material: 7 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 7 (1956), S. 138-139 
    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: The Coefficient of Temperature and the Heat of Activation of the Corrosion-Reaction of Iron in SoilThe corrosion of soft iron in different soils can be described in dependance of the soil water to soil air ratio by means of the coefficients of temperature and the heats of activation of these corrosion reactions of the iron.The mean coeffizient of temperature in soils containing 20 per cent of water was about 1,92 and in water saturated soils it was about 1.7. The heats of activation of the corrosion of iron in water saturated soils (clay, loan, river sand, infusoria) amount to 9-10 kcal, in those containing 20 per cent of water 12-18 kcal.
    Notes: Es wird gezeigt, daß man die Korrosion von Weicheisen in verschiedenen Böden in Abhängigkeit vom „Bodenwasser-Boden-luft-Verhältniß an Hand der Temperatur-koeffizienten und Aktivierungsenergien der Korrosions-Reaktionen des Eisens verfolgen kann.Der mittlere Temperaturkoeffizient betrug in Böden mit einem Wassergehalt von 20% etwa 1,92 und in mit Wasser gesättigten Böden etwa, 1,7. Die AKtivierungsenergien der Eisenkorrosion in mit Wasser gesättigten Böden (Ton, Lehm, Flußsand, Infusoria) betrugen 9 bis 10 kcal und in solchen mit 20% Wasser 12 bis 18 kcal.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 4 (1949), S. 408-408 
    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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  • 6
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Cracking on the surface of vulcanizates exposed to ozone under strain has been studied quantitatively. Butyl rubber vulcanizates were used to allow ready variation of polymer unsaturation. A relaxed sample under tension when exposed to ozone undergoes a work change manifested by increased length and decreased stress as cracking occurs. The change in work is considered related to generation of new surface in the form of cracks. Cracking is found to be primarily a surface phenomenon and in this wise permeation of the ozone into the sample assumes an important role in this phenomenon since it defines the “depth of the surface.” Polymer structure as it affects permeation appears as important as chemical inertness in controlling ozone cracking. The amount of cracking judged by change of work measured in these experiments is related linearly to the time squared. The rate of cracking is related linearly to ozone concentration squared over the range 0.03-0.20 volume per cent in air. The rate and type of cracking is dependent on extension. The analysis of this relation is complicated by relaxation effects. The state of relaxation of a sample under tension has a profound effect on the rate of ozone cracking. This effect is discussed in terms of distribution of strain of the network chains. Although cracking requires a stored energy to produce new surface, the chemical action of ozone proceeds in the absence of strain. Whether the effects of polymer degradation under conditions of zero strain become large enough to be measurable depends on the rate of permeation of ozonized air into the specimen.Vulcanization has an important bearing on ozone cracking in Butyl rubber. This is probably due to a significant decreases in the percentage of unreacted double bonds and also to a local densification of the network in the region of the double bond involved in a crosslink. Cracking is particularly sensitive to the onset of reversion. This sensitivity may arise because state of reversion may be a gradient, greatest on the surface and least at the center of the sample.
    Additional Material: 7 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 19 (1956), S. 215-218 
    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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  • 8
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A Brice-Phoenix light-scattering photometer was modified for use at elevated temperatures by enclosing the cylindrical cell filled with solvent in a tightly fitting copper block wrapped with heating wire. Heat input was controlled by a regulated Powerstat. Temperature was measured by a copper-Constantan thermocouple and maintained at 125 ± 2°C. This regulation was considered adequate for use with solutions of polyethykene in 1-chloronaphthalene. Solutions were placed in scattering cells which were shaped like Erlenmeyer flasks and could be easily removed and replaced in the bath of 1-chloronaphthalene. Commercial polyethylenes from four sources were studied with this instrument and surprisingly large dissymmetries in scattering were encountered in these samples. These dissymmetries sometimes led to correction factors greater than 6 on molecular weights measured at 90° [P-1 (90°) 〉 6]. Another surprising and significant finding was that polyethylenes from different sources has strikingly different light-scattering properties. In general, the results obtained lend support to the recent theories of Roedel and Beasley on the mechanism of “long-chain” branching and its influence on molecular-weight distribution. Samples were found to vary in their distribution ratio (weight-average molecular weight/apparent number-average molecular weight) from 2.5 to 70. According to the Beasley theory this last figure would indicate as many as 140 “long-chain” branches per weight-average molecule.
    Additional Material: 7 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 22 (1956), S. 455-462 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of chain branching on the dynamic mechanical properties of polyethylene within the temperature region 80 to 380°K. has been studied using an apparatus which drives rod-like specimens in their transverse modes. The results for three types of polyethylene having 3.2, 1.6, and less than 0.1 branches per 100 carbon atoms of the main chain are compared and discussed. Experimental results indicate that all of the three main dispersion regions (α, β, γ) characteristic of polyethylene are affected to some extent by branching. The β region, starting near 230°K., decreases with decreased branching, and for polyethylene which has negligible branching it is almost entirely absent. This suggests a direct relation between the number of branch points and the size and shape of this peak. The γ dispersion region near 170°K. appears sharper and shifted to higher temperatures with decreased branching, this being attributed to a narrowing of the relaxation times associated with the movement of a small number of CH2 units. The α dispersion region near 370°K. is also shifted to higher temperatures with decreased branching in accord with the shift of melting temperature with degree of crystallinity.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 18 (1956), S. 406-413 
    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 Me-ester of 9,11-octadecadienoic acid reacts in 1.2 and 1.4-position with moleculare oxygen to give relatively low molecular oxygen-copolymers. These polymeric peroxides produce autocatalyzing effects in the authoxidation reaction. They are rather resistent and can be stored without showing formation of aldehydes. The reaction of perbenzoic acid with external and internal double bounde standing in α-position to peroxy groups was studied at the examples of allyl-tert.-butyl peroxide and cyclohexenylmethyl peroxide.
    Notes: 9,11-Octadecadiensäuremethylester reagiert mit molekularem Sauerstoff in 1,2- und 1,4-Stellung unter Bildung von relative niedermolekularen Sauerstoff-Copolymerisation. Diese polymeren Peroxyde sind bei der Authoxydation autokatalytisch wirksam. Sie sind recht beständig; die buldung von Aldehyden wurde dei der Aufbewahrung nicht beobachtet. Die Reaktion von end- und von kettenständigen Doppelbindungen, die in Nachbarschaft zu Peroxygruppen stechen, mit Perbenzoesäure wird am Beispiel des Allyl-tert.-Butyl- und des Cyclohexenylmethylperoxyds untersucht.
    Additional Material: 3 Ill.
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