Journal
POLYMERS
Volume 10, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/polym10101075
Keywords
C-1-symmetric; titanium complex; propylene polymerization; stereospecific
Categories
Funding
- National Natural Science Foundation of China [21174026]
- program for New Century Excellent Talents in University
- Program for Prefessor (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Shanghai Education Development Foundation
- Fundamental Research Funds for the Central Universities
- Jiaxing Technology innovation Team-Cleaner Production of Leather Processing and Fabric Dyeing Finishing
- Shu Guang project
- Shanghai Municipal Education Commission
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A C-1-symmetric (methylphenyl)silylene-bridged (fluorenyl)(naphthylamido) titanium complex (1) and (diphenyl)silylene-bridged (fluorenyl)(naphthylamido) titanium complex (2) were synthesized and characterized by H-1 NMR, element analysis, and X-ray crystal analysis. The coordination mode of the fluorenyl ligand to the titanium metal is an eta(3) manner in each complex. These complexes were applied for propylene polymerization using dried modified methyaluminoxane (dMMAO) as a cocatalyst under different propylene pressures in a semi batch-type method. The catalytic activity was strongly dependent on the structure of the complex and the propylene pressure, where complex 1 exhibited the highest activity (600 kg mol(-1).h(-1)) under a propylene pressure of 8.0 atm to produce high molecular weight polypropylene. The polypropylenes obtained were syndiotactic-rich with an rr value of 0.50, indicating that the silylene bridge was not efficient for the isospecificity of a constrained geometry catalyst (CGC). The mechanical properties of the resulting polymers depended on their microstructure.
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