Journal
POLYMERS
Volume 8, Issue 2, Pages -Publisher
MDPI AG
DOI: 10.3390/polym8020031
Keywords
zirconium; post-metallocene; styrene polymerization; [OSSO]-type ligand; isotactic
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan [23750034]
- Japan Petroleum Institute
- Tokuyama Science Foundation
- JSPS fellowship for young scientists
- Grants-in-Aid for Scientific Research [25410035, 15K17866, 15H00919] Funding Source: KAKEN
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[OSSO]-type dibenzyl zirconium(IV) complexes 9 and 10 possessing aryl substituents ortho to the phenoxide moieties (ortho substituents, phenyl and 2,6-dimethylphenyl (Dmp)) were synthesized and characterized. Upon activation with dMAO (dried methylaluminoxane), complex 9 was found to promote highly isospecific styrene polymerizations ([mm] = 97.5%-99%) with high molecular weights M-w up to 181,000 gmmol(-1). When the Dmp-substituted pre-catalyst 10/dMAO system was used, the highest activity, over 7700 gmmol(10)(-1)h(-1), was recorded involving the formation of precisely isospecific polystyrenes of [mm] more than 99%.
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