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  • Chemistry  (2)
  • Hiburnacula temperatures
  • PROPULSION SYSTEMS
  • 1960-1964  (2)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Stereospecificity and electric polarization in high polymers (1960)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 42 (1960), S. 151-157 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The electric polarization of a polymer is shown to depend upon the steric order along the chain. This is in accord with the previously observed electric polarization behavior of diastereomers. Solution measurements of the molar polarization of polymethyl methacrylates in benzene gave values of 32 ± 0.5 cc./mole for syndiotactic, and 41 ± 0.5 cc./mole for isotactic material, with atactic polymer showing intermediate values. It is believed therefore that the polarizability method can form a means of differentiating and interpreting the behavior of polar stereospecific polymers.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1960.1204213917
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  • 2
    Electronic Resource
    Electronic Resource
    Resistivity studies on polymer semiconductors (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 2207-2212 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Eighteen polyacene polymers were synthesized, and their resistivities were found to be of the order of 104-105 ohm-cm. The resistivity of these polymer semiconductors was found to be sensitive to changes in the conditions of synthesis, changes in the structure of the polymers, and variations of pressure and temperature during experimentation. The forbidden energy gap for these polymers was about 0.5 e.v. Although the formalism of the simple intrinsic semiconductor band model was not strictly applicable to the data on these polymers, such a treatment was found instructive.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010641
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    Paper (German National Licenses)
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