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- W1494392887 abstract "Bisulfite initiates aqueous polymerization of certain vinyl monomers such as methyl methacrylate, ethyl methacrylate, methacrylic acid and styrene but it fails in case of acrylonitrile, vinyl acetate, methylacrylate, and acrylic acid under identical conditions. The mechanism of initiation has been discussed. Catalyst exponent of this initiator with respect to methyl methacrylate is near about 0.5. Quantitative determination of endgroup by dye techniques of the polymers obtained show that about 2 sulfonate (-SO3H) endgroups are present per chain in almost all cases. No sulphate endgroup (-OSO3H) is ever found. In case of very low initiator concentration ( < 0.005 mole/1.), some hydroxyl endgroups are also found in general but the total (sulfonate and hydroxyl combined) amounts to about 2 per polymer chain. Die Polymerisation einiger Vinylmonomerer wie z. B. Methylmethacrylat, Äthylmethacrylat, Methacrylsäure und Styrol wird in wäßriger Phase durch Bisulfit ausgelöst. Bei anderen Vinylverbindungen, wie. z. B. Acrylnitril, Vinylacetat, Methylacrylat und Acrylsäure tritt unter den gleichen Bedingungen Jedoch Keine Polymerisation ein. Der Mechanismus der Startreaktion wird diskutiert. In bezug auf die Bisulfit-Konzentration verläuft die Polymerisation des Methylmethacrylats nahezu nach der 0,5 ten Ordnung. Die quantitative Endgruppenbestimmung mittels einer kolorimetrischen Technik ergab einen Gehalt von etwa 2 Sulfonat-Endgruppen (-SO3H) pro Makromolekül. Sulfat-Endgruppen (-OSO3H) wurden nicht gefunden. Bei sehr geringen Initiatorkonzentrationen ( < 0,005 mol/l) wurden einige Hydroxylgruppen gefunden; jedoch ergab sich auch in diesen Fällen die Summe von Sulfonat- und Hydroxylendgruppen zu 2 pro Makromolekül." @default.
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- W1494392887 date "1964-12-15" @default.
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- W1494392887 doi "https://doi.org/10.1002/macp.1964.020800118" @default.
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