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

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タイトル別名
  • Dispersion Polymerization of Styrene Using Block Copolymers Composed of Polystyrene and Poly(vinyl acetate) as Stabilizers.
  • 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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抄録

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.

収録刊行物

  • 高分子論文集

    高分子論文集 50 (4), 279-286, 1993

    公益社団法人 高分子学会

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