文献类型：期刊文献

英文题名：Some mixed cyclopentadienyl-indenyl zirconium complexes with PhCH₂ or PhCH₂CH₂ substituents in ethylene polymerization

作者：Zhang, Y; Huang, JL; Yang, XX; Zhang, J; Qian, YL

机构：[1]E China Univ Sci & Technol, Organomet Chem Lab, Shanghai 200237, Peoples R China

年份：2005

卷号：43

期号：6

起止页码：1261

外文期刊名：JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000227223900012)】；

语种：英文

外文关键词：catalysts; cyclopentadienyl; ethylene polymerization; indenyl; metallocene; catalysts; metallocene complexes; NMR; polyethylene (PE); zirconium

摘要：(RCp)(R'Ind)ZrCl2 complexes 1-6 (Cp = cyclopentadienyl; Ind = indenyl; 1, R = PhCH2 and R' = H; 2, R = PhCH2 and R' = PhCH2; 3, R =PhCH2CH2 and R' = H; 4, R = PhCH2CH, and R' = PhCH,; 5, R = o-Me-PhCH2CH2 and R' = H; 6, R = o-Me--PhCH2, and R' = H) were synthesized and characterized with H-1 NMR, elemental analysis, mass spectrometry, and infrared spectroscopy. Their catalytic behaviors were compared with those of (Et3SiCp)(PhCH2CH2Cp)ZrCl2, (PhCH2Cp)(2)ZrCl2 (PhCH2Cp)(2)ZrCl2, (o-Me-PhCH2CH2CP)(2)ZrCl2, and (Ind)(2)ZrCl2 in ethylene polymerization in the presence of methylaluminoxane. Complex 5 showed high activity up to 2.43 X 10(6) g of polyethylene (PE)/mol of Zr h, and complex 4 produced PE with bimodal molecular weight distributions. The methyl group at the 2-position of phenyl in complex 5 increased the activity greatly. The relationships between the polymerization results and the structures were analyzed with NMR spectral data. (C) 2005 Wiley Periodicals, Inc.