Syndiospecifîc styrene polymerization and efficient ethylene/styrene copolymerization catalyzed by cyclopentadienyD(aryloxy)titanium(IV) complexes-MAO system

Macromolecules

Volumn 33, Issue 22, 2000, Pages 8122-8124

  Nomura, Kotohiro ^a   Komatsu, Takashi ^a   Imanishi, Yukio ^a  

^a NARA INSTITUTE OF SCIENCE AND TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

CATALYST ACTIVITY; COMPOSITION EFFECTS; COPOLYMERIZATION; ETHYLENE; MOLECULAR WEIGHT DISTRIBUTION; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; PHASE COMPOSITION; TITANIUM COMPOUNDS;

CYCLOPENTADIENYL ARYLOXYTITANIUM; METHYLALUMINOXANE;

STYRENE;

EID: 0034292023     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma0011284     Document Type: Article

References (43)

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37. For experimental details, see the Supporting Information.
38. Effect of substituents on cyclopentadienyl group in ethylene polymerization13 (Al'Bus/PhsCBCCeFsh cocatalyst): 5a (2220 kg of PE/(mol of Ti h)) > 4a (653) > 2a (258), 3a (215) > la (77). The effect in 1-hexene polymerization (MAO cocatalyst):23 5a (970 kg of polymer/(mol of Ti h)) > 3a (184) > 2a (89) > la (63) > 4a (26).
39. Molecular weight and molecular weight distribution of the resultant copolymers were measured by gel permeation chromatography (Tosoh HLC-8121GPC/HT) with polystyrene gel column (TSK gel GMHnR-H HT x 2) at 140 °C using o-dichlorobenzene containing 0.05 w/v % 2,6-di-
40. Reaction conditions: styrène, 5.0 mL; catalyst, 0.5 /
41. For a related example, CpTiCl2(O-2,6-Me2C6H3) (5b) exhibited a higher activity (139 kg of sPS/(mol of Ti h)) than 5a under the same conditions in run 1. The resultant polymer has high molecular weight (Mw = 131 x 104) with broad molecular weight distributions (MJMn = 4.81). This result also suggests that the electronic and steric factors of both aryloxy and cyclopentadienyl groups play a role in this catalysis.
42. To control the monomer conversion less than 10%, we terminated the reaction at the initial stage. The resultant polymer was separated by boiling acetone and then by boiling THF. For more details, see the Supporting Information.
43. 7b