A method for the prediction of metallocene-type catalyst activity in olefin (co)polymerisation reactions
✍ Scribed by Paul J. J. Pieters; Johannes A. M. van Beek; Maurits F. H. van Tol
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 283 KB
- Volume
- 16
- Category
- Article
- ISSN
- 1022-1336
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The use of ultraviolet/visible spectroscopy (UV‐Vis) for the prediction of metallocene catalyst potential for the polymerisation of olefins is described. Upon addition of methylaluminoxane (MAO) to rac‐[C~2~H~4~(1‐indenyl)~2~ZrCl~2~] ([Al]/[Zr] = 200) the ligand‐to‐metal charge transfer band shows a hypsochromic shift while a bathochromic shift is observed when more MAO is added ([Al]/[Zr] = 2000). These shifts can be explained by assuming that methylation of the zirconocene by MAO occurs in the case of [Al]/[Zr] = 200 while a cationic complex, the active catalytic system, is formed upon addition of more MAO, e.g., [Al]/[Zr] = 2000.