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  • Polymer and Materials Science  (2)
  • Wiley-Blackwell  (2)
  • Institute of Physics
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  • Wiley-Blackwell  (2)
  • Institute of Physics
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 5 (1954), S. 1-5 
    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 Development of Thick Coats of Chemically-resistant PaintsThe article describes the behavior of 30 different chemically-resistant paints in industrial atmospheres in which hydrochloric acid was present in six different concentrations. The paints were of five different bases, viz.: vinylresin, chlorinated rubber, siccative oils, chloro-hydrocarbon and neoprene. The relation between the durability of the paint and the thickness of the coat was specially investigated. It was proved that it was not possible to obtain lasting protective coat on steel surfaces when the total thickness of the film was less than 5 mils = 0.125 mm. This was particularly evident in the various corrosive hydrochloric in the film or to an insufficient thickness of the film on irregularities of the steel surface (corners, edges, crevices, welds, etc.). The normal paints in use in industry, when applied in three coats, only furnish a film of a average thickness of 3.5 mils. When a film thickness of more than 5 mils is applied, the continuity of the surface is complete and sufficient, even over surface irregularities. In the case of thicknesses greater than 5 mils, the durability and life of the paint is dependent upon the basic resistance of the materials used in the manufacture thereof.
    Notes: Berichtet wird über das Verhalten von 30 Anstrichstoffen auf der Basis von Vinylharz, Chlorkautschuk, trocknenden Ölen, Chlorkohlenwasserstoff und Neopren in Industrieatmosphäre mit einem Gehalt an Salzsäure in 6 verschiedenen Konzentrationen. Dabei wird vor allem die Abhängigkeit der Anstrichhaltbarkeit von der angewandten Gesamtschichtdicke untersucht. Es wird der Nachweis geführt, daß unterhalb einer Filmdicke von insgesamt 5 mils = 0,125 mm, insbesondere in der aggressiven Salzsäureatmosphäre, ein dauerhafter Schutzanstrich auf Stahluntergrund nicht zu erzielen, ist, da in diesem Falle Filmdiskontinuitäten zurückbleiben oder der Anstrich über Unregelmäßigkeiten (Ecken, Kanten, Vertiefungen, Schweißnähten) der Unterlage nur eine ungenügende Filmdicke aufweist. Handelsübliche Industriefarben liefern im Dreischichtsystem nur eine mittlere Filmdicke von 3,5 mils. Bei Filmdicken über 5 mils ist die Kontinuität des Überzugs dagegen auch über Oberflächenunregelmäßigkeiten vollständig und ausreichend. Bei Dicken oberhalb dieser Grenze ist das Verhalten nur von der Resistenz des Systems abhängig.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 16 (1955), S. 131-142 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Essential features of the crystallization of unoriented high polymers from the molten and supercooled liquid conditions are outlined to provide a background for a proposed structure and mechanism of growth of spherulites. Homogeneous and heterogeneous nucleation mechanisms of crystallite growth are discussed. Spherulites are recognized as crudely oriented spheroidal aggregates of crystallites and their attached amorphous regions. It is proposed that a spherulite originates from a single nucleus and that growth proceeds thence in a statistically radical fashion until all crystallizable domains are utilized or until growth is arrested due to increasing viscosity of the medium. It is assumed that crystallite growth occurs by lateral accretion of suitable oriented molecular segments and that nucleation proceeds from one crystallite to another by means of fine streamers of crystalline order (protofibrils) which may grow either by longitudinal extension along fringes or by lateral aggregation of very short segments. The predominant shapes of the crystallites are believed to determine the structure and optical properties of the spherulite. A roughly conical arrangement of crystallites around a spherulite radius is preferred to a helical one.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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