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  • 1985-1989  (2)
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  • 1
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Untersuchungen zur Kinetik der radikalischen Polymerisation von N,N-Dimethyl-N,N-diallylamnloniumchlorid ([MI] = 2 bis 5 mol/l, T = 6O°C) bei niedrigen Umsätzen ergaben eine Reaktionsordnung bezüglich der Initiator-konzentration von 0,5 (Ammoniumpersulfat 5 · 104 bis 5 · 103, mol/l) sowie das Fehlen einer degradativen Ketten-übertragung zum Monomer. Nachgewiesen wurde ferner ein wesentlicher Einfluß der Viskosität der Ausgangsmonomerlösungen auf die Geschwindigkeitskonstante des bimolekularen Ketteirabbruchs sowie ein starker nichtlinearer Airstieg der Polymerisationsgeschwindigkeit mit Erhöhung der Monomerkonzentration.
    Notes: Radical polymerization kinetic of N,N-dimethyl-N,N-diallylammoniumchloride was investigated in concentrated aqueous solutions ([MI] = 2 to 5 mol/l, 60°C ) a t low conversions. It was shown that under choosen conditions there was no degradation transfer to monomer reactions in this case and polymerization had square order on persulfate ammonium concentration ([PSA] = 5 · 104 to 5 · 103 mol/l). The viscosity of the initial monomer solution influences greatly the bimolecular termination constant, which leads to sharp and nonlinear increase of the rate of polymerization with increasing monomer concentration.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Some monomer derivatives of chloral and oligoesters of different structure are described. With these monomers and oligomers were obtained polyarylates and block copolysulfonarylates by means of acceptor catalyzed polycondensation. The polymers can be used as construction materials and insulating films. The physico-chemical properties of the polyesters are studied.
    Notes: Einige monomere Chloralderivate und Oligoester unterschiedlicher Struktur werden beschrieben. Auf der Basis dieser Monomere und Oligomere wurden durch acceptorkatalysierte Polykondensation Polyarylate und Block-Copolysulfonarylate erhalten, die als Konstruktions- und Isolationswerkstoff eingesetzt werden können. Die physiko-chemischen Eigenschaften dieser Polyester wurden untersucht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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