A Highly Active Catalyst Composed of ansa-Fluorenylamidodimethyltitanium Derivative for Propene Polymerization

作者：Shiono Takeshi^*; Harada Ryotaro; Cai Zhengguo; Nakayama Yuushou

来源：Topics in Catalysis, 2009, 52(6-7): 675-680.

DOI：10.1007/s11244-009-9215-3

• Constrained geometry catalyst
• Single-site catalyst
• Propene polymerization
• Living polymerization
• Syndiospecific

Me(2)Si(C(29)H(36))(N (t) Bu)TiMe(2) (4; C(29)H(36), octamethyloctahydrodibenzofluorenyl) was synthesized and characterized by elemental analysis, (1)H NMR and single crystal X-ray analysis. The complex was applied for propene polymerization using dried modified methylaluminoxane (dMMAO) as a cocatalyst at 0 A degrees C by a semi-batch method. The catalytic system showed the activity of 11,400 kg-polymer mol-Ti(-1) h(-1), which was too high to control the polymerization. Batch-wise polymerizations were then conducted by changing the amount of propene in feed. The polymerizations proceeded quantitatively, and the number-average molecular weight increased linearly against the polymer yield with keeping the number of polymer chains constant although the polydispersity indices were broader than that expected in a living polymerization. The results of postpolymerization indicated the smooth chain transfer after the monomer consumption.

• 出版日期2009-6