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  • 1985-1989  (3)
  • 1955-1959  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Sound absorption and concentration fluctuations in water–propanol mixtures (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1491-1496 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The excess ultrasonic sound absorption in 1-propanol water mixtures has been measured from 45 kHz to 474 MHz and is shown to result from a coupling of the sound wave with the long-wavelength spectrum of the composition fluctuations. The results are shown to be in agreement with the fluctuation theories of Fixman, Romanov and Solovyev, and Kawasaki and the more recent theories of Kroll and Ruhland, and Bhattacharjee and Ferrell. It is further suggested that the large absorption observed in alcohol–water mixtures may be due to the presence of large associated groups, or clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452759
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Electrical resistivity of a polyamide-epoxide copolymer (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 1321-1322 
    Details
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300334
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Electrical resistivity correlations in rigid and plasticized polymers (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 877-883 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Empirical correlations in the literature between room-temperature electrical resistivity and activation energy in various polymers are shown to be equivalent to the compensation law. Assuming that electrical conduction is an ionic process, following the Eyring theory, the compensation law can be expressed as a direct proportionality between activation energy and activation entropy. It is found that plasticizers do not change the ion number density or the ionic jump distance but only the temperature at which energy and entropy effects balance. An approximation of the ion number density is consistent with the idea that the mobile ions result from the dissociation of absorbed water.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240413
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The use of electrical resistivity in the study of the polymerization of thermosetting polymers (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 37 (1959), S. 305-308 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1203713124
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Change in electrical resistivity of some high polymers during isothermal polymerization (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 27 (1958), S. 199-205 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Epoxy, polyester, and styrene isothermal polymerizations have been monitored electrically. Sample resistivity - time records at different temperatures are reported for each class of polymer. These plots suggest that relative rates of reaction could be conveniently obtained if a correlation between extent of polymerization and electrical resistivity were known for the particular resins studied. Qualitative agreement between changes in infrared absorption and changes in volume resistivity as a measure of the extent of polymerization has been obtained.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1202711516
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    Paper (German National Licenses)
    Fulltext
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