Dispersion Polymerization of Styrene Using Block Copolymers Composed of Polystyrene and Poly(vinyl acetate) as Stabilizers.

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  • ポリスチレンとポリ酢酸ビニルからなるブロック共重合体を安定剤とするスチレンの分散重合
  • ポリスチレン ト ポリ サクサン ビニル カラ ナル ブロック キョウジュウゴ

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Abstract

Using thiolacetic acid as a chain transfer agent in radical polymerization of styrene, polystyrene having a thioacetate group at one end of the chain (PSt-SAc) was obtained. Transesterification reaction of the thioester group with methanol afforded polystyrene having a mercapto group at one end (PSt-SH). Vinyl acetate was polymerized in the presence of PSt-SH, and an A-B type block copolymer (PSt-b-PVAc) was obtained. Dispersion polymerization of styrene was performed in ethanol using the block copolymer (PSt-b-PVAc) thus obtained or a partially hydrolyzed block copolymer [PSt-b-P (VA/VAc) ]. Polystyrene (PSt) particles of 0.3-417 pm average diameter with relatively sharp particle size caused coagulation in the course of polymerization. With an increase in the amount of the block copolymer, particle diameters decreased. After the middle stage of the polymerization the particles grew with the almost constant number of particles.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 50 (4), 279-286, 1993

    The Society of Polymer Science, Japan

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