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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 5 (1961), S. 104-107 
    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: A tracer study has been made of the polymerization of acrylonitrile in an aqueous solution at 25°C with the use of radioactive K2S352O8 and NaHS35O3 in a redox catalyst system. Persulfate and bisulfite give sulfate and sulfonate endgroups, respectively. The contents of these endgroups in the polymer were determined and the following empirical equation was derived: \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{{[{\rm Sulfonate endgroups]}}}{{[{\rm Sulfate endgroups]}}} = 1 + 0.27\left\{ {\frac{{[{\rm NaHSO}_{\rm 3} ]}}{{[{\rm AN] [K}_{\rm 2} {\rm S}_{\rm 2} {\rm O}_{\rm 8} ]}}} \right\}^{1.5} $ \end{document} Sulfonate is the major endgroup under every condition of polymerization. A tentative discussion of the polymerization initiation reaction in this redox system is given in order to account for the above experimental results.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 36 (1960), S. 102-108 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Styrol wurde in Methylenchlorid mit Mineralsäure, wie Schwefelsäure und Chlorwasserstoff, als Katalysator polymerisiert. Diese beiden Katalysatoren geben bei tiefer Temperatur Polymere von hohem Molekulargewicht. Wasser inhibiert die Polymerisation, was vielleicht der Bildung des H3O+ -Ions zuzuschreiben ist, das keine Polymerisation initiiert. Dies unterscheidet sich von der Polymerisation mit FRIEDEL-CRAFTS Katalysatoren, wo Wasser die Rolle eines Cokatalysators besitzt. Es wird angenommen, daß sich durch die Übertragung des Protons von H3SO4+ oder CH2Cl2H+ auf Styrol ein Carboniumion bildet, das die Polymerisation auslöst.
    Notes: Styrene was polymerized methylene chloride by hydrogen acid catalysts such as sulfuric acid and hydrogen chloride. Both catalysts give polymers of high molecular weight at low temperature. Water inhibits the polymerization, which may be due to the formation of H3O+ incapable of initiating polymerization. It contrasts with the polymerization by FRIEDEL-CRAFTS catalysts, where water behaves as a co-catalyst. It was considered that a carbonium ion may be generated by the transfer of proton from H3SO4+ or CH2Cl2H+ to styrene monomer and the polymerization may proceed by resultant carbonium ion.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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