Recent Developments in Toransition Metal-Catalyzed Polymerization. II. Investigation of the Distribution of Isospecificity of Active Sites on the MgCl2-Supported Ziegler Catalyst by Temperature Rising Elution Fractionation Analysis.

• MATSUOKA Hitoshi

  Tsukuba Research Laboratory, Tokuyama Corporation

• NISHIYAMA Isa

  Japan Science and Technology Corporation

• NAKATANI Hisayuki

  Center for New Materials, Japan Advanced Institute of Science and Technology

• LIU Boping

  School of Materials Science, Japan Advanced Institute of Science and Technology

• TERANO Minoru

  School of Materials Science, Japan Advanced Institute of Science and Technology

Bibliographic Information

Other Title

• 遷移金属触媒重合の新展開　ＩＩ　　昇温溶離分別法を用いたＭｇＣｌ２担持型Ｚｉｅｇｌｅｒ触媒におけるイソ特異的活性点の特性分布解析
• ショウオン ヨウリ ブンベツホウ オ モチイタ MgCl2 タンジガタ Ziegler ショクバイ ニ オケル イソ トクイテキ カッセイテン ノ トクセイ ブンプ カイセキ

Abstract

The distribution and transformation of isospecificity of active sites of MgCl₂-supported Ziegler catalyst were investigated on the basis of the isotacticity distribution of the polypropenes (PPs) analyzed using the temperature rising elution fractionation method (TREF). PPs were prepared by the stopped-flow method using various MgCl₂-supported Ziegler catalyst systems. The result of the electron donor-free catalyst system shows that the highly isospecific active sites derived from the highest isotactic fraction (elution temperature by TREF is over 112°C) exist in this catalyst system. The isospecificity of active sites in the donor-free catalyst might be originated from surface monolayer multinuclear titanium species, namely “Island” of titanium species. Addition of internal donor can transfer a significant amount of aspecific active sites as well as the second highest isospecific sites into the highest isospecific active sites. Whereas, addition of external electron donor converted some part of aspecific active sites into the second highest isospecific active sites, but showed no effect on the highest isospecific active sites.

Journal

• KOBUNSHI RONBUNSHU

  KOBUNSHI RONBUNSHU 59 (6), 402-405, 2002

  The Society of Polymer Science, Japan

Keywords

• MgCl<SUB>2</SUB>-Supported Ziegler Catalyst
• Isospecificity of Active Site
• Propene Polymerization
• Electron Donor Compound
• Stopped-Flow Method
• Temperature Rising Eution Fractionation Method

Details

• CRID: 1390001206522080384
• NII Article ID: 10008834639
• NII Book ID: AN00085011
• DOI: 10.1295/koron.59.402
• ISSN: 18815685
• ISSN: 03862186
• NDL BIB ID: 6200569
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6200569
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed