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  • Polymer and Materials Science  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 35 (1984), S. 7-15 
    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: ESCA Untersuchungen an Stählen, gebeizt in HCl mit und ohne InhibitorzusatzEs wird berichtet über ESCA Untersuchungen (Electron Spectroscopy for Chemical Analysis) an kalt gewalzten ST 13 Stahlproben, gebeizt in HCl-Lösung mit und ohne Inhibitor-Zusatz (Dibutylthioharnstoff, DBTU). Die Ergebnisse zeigen, daß das DBTU-Molekül dissoziativ an der Metalloberfläche chemisorbiert wird. Das häufig benutzte Inhibitionsmodell, daß die Metalloberfläche durch die Inhibitormoleküle vollständig bedeckt wird und damit das Metall vor dem Angriff durch die Säure geschützt wird, kann für den Inhibitor DBTU durch unsere ESCA-Experimente nicht bestätigt werden. Die Ergebnisse sind in Übereinstimmung mit anderen Beobachtungen über die Chemisorption schwefelhaltiger Moleküle an Eisen-Oberflächen.
    Notes: ESCA experiments (Electron Spectroscopy for Chemical Analysis) on cold rolled ST 13 steel samples, etched in HCl solutions without and with inhibitor additives (dibutylthiourea, DBTU) are reported.These data showed, that DBTU is dissociatively chemisorbed at the metal surface. The frequently used assumption that the metal surface is covered by the inhibitor molecules preventing the direct attack of the acid cannot be confirmed by our ESCA results, at least for the inhibitor DBTU. The results are in agreement with previous findings on the chemisorption of sulphurous molecules on iron surfaces.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1132-1133 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 215-225 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Acetylation of phenol-formaldehyde (PF) wood adhesives afforded derivatives which could be characterized by proton magnetic resonance (PMR) spectroscopy. Through use of the chemical shift and integral parameters, relative comparisons were made for the degree of polymerization of resins prepared with different molar ratios. Additionally, PMR studies of these acetylated derivatives provided a means of determining methylol content and number of aromatic protons remaining, and to some extent gave an estimate of molar formaldehyde-to-phenol ratio. Experiments conducted with Ca(OH)2 and NaOH as catalysts showed the latter to be the more effective catalyst for PF systems.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 1973-1985 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Comparisons were made of differential scanning-calorimetric (DSC) thermograms of both liquid and powdered commercial phenol-formaldehyde resins. By a combination of the results from analyses under a variety of conditions, such as ambient pressure, high pressure, using freeze-dried samples, and also by direct observation of the resin-curing process in wood-veneer assemblies, the curing reactions of phenol-formaldehyde resins were found to differ for resol and novolac systems. At a heating rate of 10°C/min, the resol resin showed endothermic curing reactions at temperatures of about 150°C, while the novolac-type resin showed an exothermic peak maximum at about 160°C. Results are presented to show how DSC can be used to differentiate between a resol and novolac system.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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