Journal
POLYMERS
Volume 9, Issue 4, Pages -Publisher
MDPI AG
DOI: 10.3390/polym9040131
Keywords
constrained geometry catalysts; propylene; living polymerization; stereospecificity
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Funding
- National Natural Science Foundation of China [21174026]
- program for New Century Excellent Talents in University
- Program for Prefessor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Fundamental Research Funds for the Central Universities
- Shanghai Municipal Education Commission and Shanghai Education Development Foundation
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A series of ansa-silylene(fluorenyl)(amido) titanium complexes (1a-1c, 2a, and 2b) bearing various substituents on the amido and fluorenyl ligands are synthesized and characterized by elemental analysis, H-1 NMR, and single crystal X-ray analysis. The coordination mode of the fluorenyl ligand to the titanium metal is eta(3) manner in each complex. The propylene polymerization is conducted with these complexes at 0 and 25 degrees C in a semi batch-type method, respectively. The catalytic activity of 1a-1c bearing cumyl-amido ligand is much higher than that of 2a and 2b bearing naphthyl group in amido ligand. High molecular weight polypropylenes are obtained with narrow molecular weight distribution, suggesting a living nature of these catalytic systems at 0 degrees C. The polymers produced are statistically atactic, regardless of the structure of the complex and the polymerization temperature.
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