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In situ 1 H‐ and 27 AL‐NMR studies on metallocene catalyst systems—Catalysts for olefin polymerization
Author(s) -
Zhang Zhongyue,
Duan Xiaofang,
Zheng Ying,
Wang Jingzun,
Tu Guangzhong,
Hong Shaoliang
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000725)77:4<890::aid-app24>3.0.co;2-y
Subject(s) - hydrolysis , chemistry , polymer chemistry , catalysis , nuclear magnetic resonance spectroscopy , polymerization , proton nmr , in situ , carbon 13 nmr , nmr spectra database , organic chemistry , spectral line , polymer , physics , astronomy
The process of partial hydrolysis reaction of TMA with water and the interaction of zirconocene dichloride (Cp 2 ZrCl 2 ) with TMA, MAO, and the in situ partially hydrolyzed products of TMA were studied by in situ 1 H‐ and 27 Al‐NMR spectroscopy. The 1 H‐NMR spectra of MAO samples and the in situ hydrolyzed products of TMA with water under different conditions are different. A new peak at δ = −0.58 ppm in 1 H‐NMR spectra is observed, and is supposed to be due to the methyl resonance of MAO with low molecular weight. Alkylation reaction is observed between Cp 2 ZrCl 2 and TMA, MAO, and the in situ hydrolyzed products of TMA, and TMA is supposed to be the actual alkylating agent. 27 Al‐NMR studies show that MAO is tetra‐coordinated. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 890–897, 2000