Efficient Molecular Weight Control with Trialkylaluminum in Ethylene/Norbornene Copolymerization by [Ph_2C(Flu)(3-MeCp)]ZrCl_2/Methylaluminoxane Catalyst

• Tada, Tomoyuki

• Cai, Zhengguo

• Nakayama, Yuushou

• Shiono, Takeshi

抄録

Ethylene/norbornene copolymerizations were conducted with [Ph_2C(Flu)(3-RCp)]ZrCl_2 [R: Me (1) or Me_3Si (2)], which give alternating EN copolymers. The activity of 1 in the absence of R_3Al was approximately twice that of 2 and increased further upon addition of R_3Al. Et_3Al increased the activity most effectively, and the M^^-_n of the produced polymer decreased from 100 000 to 25 000 g.mol^<-1>. On the other hand, the M^^-_n value increased upon addition of (Bu_3Al)-Bu-i from 100 000 to 209 000 g.mol^<-1> accompanied by an approximate to 2.5-fold increase of activity. Consequently, 1 was found to be one of the most promising complexes for the synthesis of alternating EN copolymers, of which M^^-_n value was efficiently controlled by the kind and the amount of R_3Al added.

収録刊行物

• Macromolecular Chemistry and Physics

  Macromolecular Chemistry and Physics 211 (19), 2132-2137, 2010

  Wiley-VCH Verlag GmbH

キーワード

• chain transfer
• copolymerization
• ethylene
• metallocene catalysts
• norbornene
• polyolefins
• synthesis

詳細情報

• CRID: 1050859215939407872
• NII論文ID: 120002753659
• NII書誌ID: AA10984295
• Web Site: http://ir.lib.hiroshima-u.ac.jp/00030776
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles