Branching Copolymer Synthesis from Divinylbenzene-containing Olefinic Terpolymer

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Other Title
  • ジビニルベンゼンユニットを含有するオレフィン系共重合体を用いた分岐型共重合体の合成
  • ジビニルベンゼンユニットを含有するオレフィン系共重合体を用いた分岐型重合体の合成
  • ジビニルベンゼンユニット オ ガンユウ スル オレフィンケイ キョウジュウゴウタイ オ モチイタ ブンキガタ ジュウゴウタイ ノ ゴウセイ

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Description

The ethylene (Et) - styrene (St) - divinylbenzene (DVB) terpolymer was synthesized from Et, St, and small amount of DVB using rac-isopropylidenebis(4,5-benzindenyl) zirconium dichloride/MAO coordination polymerization catalyst system. The terpolymer obtained highly keeps a pendant aromatic vinyl group from self cross-linking, which is considered to be a useful building block for the branching copolymer synthesis.<br>The branching copolymers are synthesized from the Et-St-DVB terpolymer and styrene using anionic polymerization. The resulting copolymers showed uniformnano-scale phase separated structure corresponding to the main chain Et-St copolymer phase as soft segment and side chain polystyrene (PS) phase as hard segment. Mechanical strength and transparency increase with DVB content from 0.05 to 0.11 mol% of the Et-St-DVB terpolymers employed, with keeping good processability (MFR value). The mechanical properties are changed from thermoplastic elastomer to plastic by changing the weight ratio of the soft/hard segment, as well as the morphologies of the sea/islandstructure.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 82 (9), 382-388, 2009

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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