Efficient ethylene/norbornene copolymerization by (aryloxo)(indenyl)titanium(IV) complexes-MAO catalyst system

Macromolecules

Volumn 36, Issue 11, 2003, Pages 3797-3799

  Nomura, Kotohiro ^a   Tsubota, Miki ^a   Fujiki, Michiya ^a  

^a NARA INSTITUTE OF SCIENCE AND TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ARYLOXOINDENYLTITANIUM COMPLEXES; NORBORNENE;

CATALYSIS; CATALYST ACTIVITY; CATALYSTS; COPOLYMERIZATION; CRYSTAL MICROSTRUCTURE; ETHYLENE; GLASS TRANSITION; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; SYNTHESIS (CHEMICAL); TEMPERATURE;

METALLORGANIC POLYMERS;

EID: 0038408491     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma034215f     Document Type: Article

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29. Some of these results were introduced at the 1st Mitsui Chemicals International Symposium on Catalysis Science (MICS2003, Chiba, Japan, March 2003).
30. 2. This result may also support our initial assumption. Hasan, T.; Nishii, K.; Shiono, T.; Ikeda, T. Macromolecules 2002, 35, 8933.
31. Nomura, K.; et al. Unpublished results and some results are shown in the Supporting Information.
32. For experimental details, see the Supporting Information.
33. To control NBE conversion less than 10%, we terminated the reaction at the initial stage.
34. 13C NMR spectra established previously by Tritto et al.
35. For more detailed results by 1-3-MAO catalysts, see the Supporting Information.
36. Polymerization conditions were the same as those in run 17, except that 10.0 μmol of 1, 7.0 mmol of MAO (Al/Ti = 700), and the reaction was performed for 120 min. Yield: 8.6 mg (activity = 0.43 kg of polymer/(mol of Ti h)).
37. 2-d-MAO catalyst systems. Detailed results and related references are introduced in the Supporting Information.
38. g values and NBE contents was obtained for the copolymer by 1-5-MAO catalysts, probably due to that the resultant copolymer (especially NBE repeat units) possessed no stereoregularity with random incorporation.
39. n = 1.6) when the polymerization was performed under the same conditions as in run 18, except that ethylene pressure was 1 atm (1, 10.0 μmol; Al/Ti = 500, time, 60 min).
40. + were 13.18 and 14.67 kcal/mol. In addition, the coordination mode of ethylene at the optimized structure by 1a was perpendicular to both the indenyl ring and the alkyl chain that should require another barrier for insertion, whereas the coordination mode of norbornene by 1b was parallel to both the indenyl ring and the alkyl chain. We assume that these may be the origin of the observed notable difference between 1 and 2.