In situ1H- and 27AL-NMR studies on metallocene catalyst systems—Catalysts for olefin polymerization
✍ Scribed by Zhongyue Zhang; Xiaofang Duan; Ying Zheng; Jingzun Wang; Guangzhong Tu; Shaoliang Hong
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 199 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
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 ␦ ϭ Ϫ0.58 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.