Precision Polymerization and Polymers I. Control of Branched Structure of Radical Polymer by Addition-Fragmentation Chain Transfer-Preparation of Star Polymer.

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  • YAMADA Bunichiro
    Material Chemistry Laboratory, Faculty of Engineering, Osaka City University
  • KONOSU Osamu
    Material Chemistry Laboratory, Faculty of Engineering, Osaka City University

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Other Title
  • 精密重合・精密合成高分子Ｉ　　付加開裂型連鎖移動を利用したラジカル重合における分岐構造の制御　星形ポリマーの合成
  • フカ カイレツガタ レンサ イドウ オ リヨウシタ ラジカル ジュウゴウ ニ

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Abstract

Addition-fragmentation chain transfer of methyl 2- (benzylthiomethyl) acrylate was employed for quantitative introduction of 2-carbomethoxy-2-allyl group to the ω-end of polymer. Although the allyl group is feasible to addition of the polymer radical of styrene (St), the polymer radical from methyl methacrylate (MMA) exhibited quite low reactivity. When St was polymerized in the presence of the poly (MMA) bearing the allyl end group, the addition of the poly (St) radical and subsequent coupling of the resulting radical with the poly (St) radical yielded a block copolymer consisting of a poly (MMA) chain and two poly (St) chains without crosslinking. Ethylene bis [2- (benzylthiomethyl) acrylate] as a difunctional chain transfer agent yielded the poly (MMA) bearing two allyl groups to which the poly (St) radical readily added to form branching. The addition to the allylic end group and the subsequent coupling with the poly- (St) radical could lead to a six-armed polymer. The allylic end group was found to react quantitatively in the presence of an excess amount of St monomer relative to the end group, and the homopolymerization of St was not avoidable.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 54 (10), 723-730, 1997

    The Society of Polymer Science, Japan

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