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  • 1
    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: Formaldehyde-S-vinylmercaptales were synthesized by dehydratisation of the analogous β-hydroxyathyl compounds. The monomers were polymerized by radical (AIBN) and cationic initiators (BF3). In the case of the radically induced polymerization the degree of polymerization (P̄ ∼ 100) was nearly independent of the initiator concentration. This can be explained by the high reactivity of the -S-CH2-S- group towards radicals. Acylperoxides did not initiate the polymerization of the vinylmercaptales, but they were consumed by an induced peroxide-decomposition by the mercaptales. Due to sulfonium-salt formation the cationic polymerization yielded oligomeric products only.
    Notes: Formaldehyd-S-vinylmercaptale wurden durch Dehydratisieren aus den entsprechenden β-Hydroxyäthylmercaptalen dargestellt. Die Monomeren konnten radikalisch (mit AIBN) und kationisch (mit BF3-ätherat) polymerisiert werden. Die für die radikalische Polymerisation ermittelten Polymerisationsgrade (P̄ ∼ 100) sind durch die Reaktionsfähigkeit der -S-CH2-S-Gruppe gegenüber Radikalen von der Initiatorkonzentration weitgehend unabhängig. Acylperoxide konnten als Initiatoren nicht verwendet werden, da die Mercaptalgruppe einen induzierten Peroxidzerfall bedingt. Die kationische Polymerisation gab über Sulfoniumsalze oligomere Produkte.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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