Polymerization of propylene with [t-BuNSiMe2Ind]TiMe 2-MAO catalyst systems
Journal of Molecular Catalysis A: Chemical 231 巻 1-2 号
241-246 頁
2005-04 発行
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JMolCatalA231_241.pdf
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種類 :
全文
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タイトル ( eng ) |
Polymerization of propylene with [t-BuNSiMe2Ind]TiMe 2-MAO catalyst systems
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作成者 |
Nishii Kei
Ikeda Tomiki
Akita Munetaka
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収録物名 |
Journal of Molecular Catalysis A: Chemical
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巻 | 231 |
号 | 1-2 |
開始ページ | 241 |
終了ページ | 246 |
著者キーワード |
Isotactic
Metallocene catalysts
Poly(propylene) (PP)
Quasi-living polymerization
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内容記述 |
ansa-Indenylamidodimethyltitanium complex ([t-BuNSiMe2Ind] TiMe2: 1) was synthesized by one-pot reactions starting from the ligand, MeLi and TiCl4. The structure of 1 was determined by X-ray crystallography and the results obtained revealed that the indenyl ligand coordinate to titanium in an η4-tendency. Propylene polymerization was conducted with 1 in toluene or heptane as solvent at 0°C in the presence of dried methylaluminoxane (MAO) or dried modified MAO (MMAO), which was prepared from the toluene solutions of MAO or MMAO by removing free trialkylaluminium contained. Polymerization behavior was investigated from the consumption rate of propylene in a semi-batch system. The dried MAO/toluene system showed the highest activity without any deactivation. The produced polymer in the dried MAO/toluene system had the highest molecular weight and narrowest molecular weight distribution. The number-average molecular weight of the polymer increased almost linearly with increasing polymerization time accompanied by narrowing molecular weight distribution from 1.42 to 1.37 and the number of polymer chains was almost constant. Thus, it was found that quasi-living polymerization of propylene proceeded. The 13C NMR measurement indicated that 1-dried MAO/toluene produced poly(propylene) with isotactic triad of 40%.0
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NDC分類 |
化学 [ 430 ]
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言語 |
英語
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資源タイプ | 学術雑誌論文 |
出版者 |
Elsevier
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発行日 | 2005-04 |
権利情報 |
Copyright (c) 2005 Elsevier B.V
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出版タイプ | Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版) |
アクセス権 | オープンアクセス |
収録物識別子 |
[ISSN] 1381-1169
[DOI] http://dx.doi.org/10.1016/j.molcata.2004.12.035
~の異版である
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