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  • Physics  (3)
  • 1975-1979  (3)
  • 1976  (3)
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  • 1975-1979  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Physicomechanical properties of grafted polymers obtained by radiation-induced polymerization by radical and ionic mechanisms (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 1825-1828 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The radiation-induced grafting of acrylonitrile, 4-vinylpyridine, and styrene was carried out by both radical and ionic mechanisms. Grafted polymers with equal percentages of graft were obtained by the radical and ionic propagation of the grafted chains. The molecular weight of homopolymers has been determined. The thermomechanical properties of the graft polymers were investigated. The yield temperatures for the graft polymers obtained by ionic propagation of the grafted chains is higher than that of graft polymers obtained by a radical mechanism. This is attributed to the higher molecular weight of the grafted chains obtained by the radiation-induced grafting by the ionic mechanism. The radiation-induced grafting of polyacrylonitrile increases significantly the thermal stability of polyethylene. The differential thermal analysis shows no marked differences in properties of the polymers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170140802
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of crystalline polyelectrolytic complexes on matrix polymerization (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 2351-2356 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zwitterionic matrix stepwise polymerization of 4-vinylpyridine (VP) using isotactic poly(acrylic acid) (i-PAA) as a template results in formation of crystalline polycomplexes consisting of i-PAA and of ionene (I): Depending on the concentration of VP and i-PAA, the two types of crystalline polycomplexes can be prepared. The complex containing long ionene sequences with n ≫ 2 is formed when [VP]0 = [i-PAA]0 ≥ 0.05M. At [VP]0 = [i-PAA]0 ≤ 0.01M, the complex formed evidently contains the ionene dimer (n = 2). The x-ray structures of the crystalline complexes are identical with those obtained by mixing of i-PAA and the corresponding dimer and polymer presynthesized in the absence of the template. The matrix polymerization of VP in the presence of syndiotactic and atactic PAA at the same conditions results in formation of amorphous polycomplexes.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170141002
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  • 3
    Electronic Resource
    Electronic Resource
    The nature of active centers of a polymeric catalase analog (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 2595-2605 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The decomposition of hydrogen peroxide by a polymer complex of Fe3+ and poly(acrylic acid) partially amidated by diethylenetriamine has been studied. The molecular mechanism of catalysis is discussed. The rate constant of the reaction is k = 6.9 × 107 exp {-2.300/RT}. Decomposition of hydrogen peroxide proceeds via activation by the diethylenetriamine which is a cofactor.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170141101
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