Retardation Effect Induced by Pyridine in the Radical Copolymerization of Styrene and Liquid Sulfur Dioxide

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概要

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• We have found that the radical copolymerization of styrene and liquid sulfur dioxide (liq. SO<SUB>2</SUB>) is retarded when a basic solvent such as pyridine is used; we also investigated the mechanism of the retardation induced by pyridine. The polymerization in pyridine was most strongly retarded when the styrene mole fraction in the feed, [St]<SUB>0</SUB>/ ([St]<SUB>0</SUB>+[SO<SUB>2</SUB>]<SUB>0</SUB>), was small (below about 0.2) and when the pyridine mole fraction in pyridine-liq.SO<SUB>2</SUB>, [Py]<SUB>0</SUB>/ ([Py]<SUB>0</SUB>+[SO<SUB>2</SUB>]<SUB>0</SUB>, was 0.4–0.5. Moreover, from the results in the reaction of the phenylsulfonyl radical (the model radical for the propagating sulfonyl radical) in pyridine or in a pyridine - liq. SO<SUB>2</SUB> mixture, it may be concluded that the end unit of the polymer has the pyridinium sulfonate structure (–SO<SUB>3</SUB><SUP>−</SUP>HPy<SUP>+</SUP>) and that the retardation may occur by means of the reaction of the propagating sulfonyl radical with the pyridine-SO<SUB>2</SUB> complex.

• 公益社団法人 日本化学会の論文

著者

• Tokura Niichiro

  Chemical Research Institute of Non-aqueous Solutions Tohoku University

• Matsuda Minoru

  Chemical Research Institute of Non-aqueous Solutions, Tohoku University

• IINO MASASHI

  Chemical Engineering Laboratory, Tokyo Metropolitan University

• Enomoto Tsutomu

  Chemical Research Institute of Non-Aqueous Solutions, Tohoku University

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