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Volumn 41, Issue 20, 2008, Pages 7306-7315

Highly ACtive catalysts for the ring-opening polymerization of ethylene oxide and propylene oxide based on products of alkylaluminum compounds with bulky tetraphenol ligands

Author keywords

[No Author keywords available]

Indexed keywords

2 PROPANOLS; ACTIVE CATALYSTS; ATACTIC; BENZYL ALCOHOLS; CHAIN TRANSFERS; DIBENZOTHIOPHENE; DINUCLEAR; ETHYLENE OXIDES; INSERTION PROCESSES; MECHANISTIC INVESTIGATIONS; PHENOL GROUPS; PHENOL HYDROXYL GROUPS; PROPYLENE OXIDES; RING-OPENING POLYMERIZATIONS; TRIETHYLAMINE; TRIISOBUTYL ALUMINUMS;

EID: 55649083753     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma801468u     Document Type: Article
Times cited : (31)

References (48)
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    • Turner, H. W, Dales, G. C, VanErden, L, van Beek, J. A. M, to Symyx Technologies Inc, U.S. Patent No. 6,306,658
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    • Vandenberg demonstrated that addition of 0.05-0.5 equiv of Lewis base brought significant activity improvement for TiBA-catalyzed polymerization of EO, while using 0.25 and 0.5 equiv of Lewis base gave highest activity (ref. 4). We confirmed Vandenberg's finding by testing TiBA as catalysts for EO polymerization in a glass reactor in the presence of various Lewis bases; and found that excess (> 0.5 equiv) base resulted in a loss of activity. Therefore, we used 0.5 equiv of Lewis base in this work.
    • Vandenberg demonstrated that addition of 0.05-0.5 equiv of Lewis base brought significant activity improvement for TiBA-catalyzed polymerization of EO, while using 0.25 and 0.5 equiv of Lewis base gave highest activity (ref. 4). We confirmed Vandenberg's finding by testing TiBA as catalysts for EO polymerization in a glass reactor in the presence of various Lewis bases; and found that excess (> 0.5 equiv) base resulted in a loss of activity. Therefore, we used 0.5 equiv of Lewis base in this work.
  • 44
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    • The ratio of productivities for TiBA- and DEAC-based catalysts based on bulky ligands such as 7e is probably even larger than is shown in Figure 2 because the runs were made at 5 μmol A1. At this catalyst concentration, the productivities of TiBA-based catalysts with very bulky ligands are underestimated, as can be seen in Table 5.
    • The ratio of productivities for TiBA- and DEAC-based catalysts based on bulky ligands such as 7e is probably even larger than is shown in Figure 2 because the runs were made at 5 μmol A1. At this catalyst concentration, the productivities of TiBA-based catalysts with very bulky ligands are underestimated, as can be seen in Table 5.


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