Atactic polymerization of propylene catalyzed by mono(η5-cyclopentadienyl)titanium tribenzyloxide combined with methylaluminoxane
✍ Scribed by Qing Wu; Zhong Ye; Qinghai Gao; Shangan Lin
- Book ID
- 101269585
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 132 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0887-624X
No coin nor oath required. For personal study only.
✦ Synopsis
Propylene has been polymerized with mono( h 5 -cyclopentadienyl)titanium tribenzyloxide activated with methylaluminoxane (MAO). It was found that the content of residual trimethylaluminium (TMA) in MAO has a determinative effect on the polymerization. An excess of TMA in the catalyst system reduces the Ti species to inactive lower valent states. The catalyst system gives medium molecular-weight atactic polypropylene (M v Å 2-7 1 10 4 ) with narrow molecular weight distribution (M w / M n Å 1.4-1.8). The polymer has a stereoirregular structure described by Bernoullian statistics. Statistical analysis of the regiotriad distribution of the polypropylene chains indicates a regioblock microstructure.