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  • 1965-1969  (1)
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 112 (1968), S. 40-48 
    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: Die kationische Polymerisation von Formaldehyd bei tiefer Temperatur wurde untersucht. Bei der Polymerisation in Alkanen mit LEWIS- oder BRÖNSTED-Säuren, J2, JCl, JCl3, JBr, SO2 sowie binären Systemen aus SO2 und den vorstehenden Verbindungen entstehen hochmolekulare Polyoxymethylene mit reduzierten Viskositäten über l dl/g. Der Polymerisationsgrad hängt von den Polymerisationsbedingungen, vor allem vom Lösungsmittel und der Polymerisationstemperatur, sowie vom Zusatz übertragender Zusätze wie Wasser, Ameisensäure, Methanol und Methylformiat ab.
    Notes: Cationic polymerization of monomeric formaldehyde has been studied at low temperature. It was found that high molecular weight polyoxymethylene with the reduced viscosity higher than 1.0 dl/g was readily obtained when the polymerization of formaldehyde was carried out in saturated hydrocarbons in the presence of LEWIS acids, BRÖNSTED acids, I2, ICl ICl3, IBr, sulfur dioxide and binary systems of sulfur dioxide with these compounds at considerably low temperature. The degree of polymerization was effected by the polymerization conditions, especially solvent, polymerization temperature and addition of chain transfer agents such as water, formic acid, methanol or methyl formate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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