Study of metallocene supported on porous and nonporous silica for the polymerization of ethylene
β Scribed by R. Quijada; R. Rojas; L. Alzamora; J. Retuert; F.M. Rabagliati
- Book ID
- 110383711
- Publisher
- Springer US
- Year
- 1997
- Tongue
- English
- Weight
- 269 KB
- Volume
- 46
- Category
- Article
- ISSN
- 1011-372X
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π SIMILAR VOLUMES
## Abstract Four supported metallocene catalysts were synthesized directly on silica [Si(CpZrCp), Si(CpZrInd), Si(IndZrCp), and Si(IndZrInd)]. The first ligand was chemically tethered to silica (internal ligand) while the second was free from silica (external ligand). The polymerization of ethylene
## Abstract Ethylene was polymerized at 5 bar in a stirred powder bed reactor with silica supported __rac__βMe~2~Si[Ind]~2~ZrCl~2~/methylaluminoxane (MAO) at temperatures between 40Β°C and 80Β°C using NaCl as support bed and triethylaluminium (TEA) as a scavenger for impurities. For this fixed recipe
In the present work Et(IndH 4 ) 2 ZrCl 2 was immobilized on silica previously modified with different chemical compounds, namely VOCl 3 , SnCl 4 , Bu 3 SnH, Me 2 SiHCl, polymethylhydrosiloxane (PMHS) and such systems were compared to methylaluminoxane (MAO) pretreated systems. Bu 3 SnH-modified sili