Radical Polymerization of Styrene in the Presence of Bis (isopropyl xanthogen)

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  • ビスイソプロピルキサントゲンの存在下におけるスチレンのラジカル重合
  • ビスイソプロピルキサントゲン ノ ソンザイカ ニ オケル スチレン ノ ラジカ

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Abstract

Radical polymerization of styrene (St) in the presence of bis (isopropyl xanthogen), CH3CH (CH3) -OC (S) -SS-C (S) O-CH (CH3) CH3 (BX), was carried out in benzene at 70°C. The number of the xanthate (X) end groups per polymer molecule (Na/2) decreased with increasing conversion except the case of high feed ratio of [BX] 0/ [St] 0. The chain transfer constant was determined to be 4.43 by measuring both the number-average degree of polymerization and the sulfur content extrapolated to zero conversion. Hydrolyses of the X end groups in polymers with ethanolic potassium hydroxide or morpholine in nitrogen atmosphere proceeded smoothly and completely. However, it was found that the hydrolyzed polymers contained only about 70% of the theoretical amount of mercapto end groups, and they had molecular weights which corresponded to the consumed amount of the mercapto groups. Copolymerizations of St with divinyl benzene in the presence of BX proceeded to a high conversion without gelation under suitable conditions. The (Na/2) values of copolymers were considerably higher than those of the homopolymers and by oxidation the hydrolyzed copolymers were converted to insoluble copolymers.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 34 (2), 97-102, 1977

    The Society of Polymer Science, Japan

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