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- Title
Aluminum Initiators Supported by Asymmetric [ONNO′]-Type Salan Ligands for the Ring-Opening Polymerization of rac-Lactide.
- Authors
Sumrit, Pattarawut; Hormnirun, Pimpa
- Abstract
A novel series of aluminum complexes supported by asymmetric [ONNO′]-type Salan ligands ( 1-4) is successfully synthesized. Polylactides (PLAs) with molecular weights close to the theoretical values and narrow polydispersity indices (PDIs) can be obtained. Kinetic studies reveal first-order polymerization kinetics and a linear relationship between the molecular weight and the percentage conversion. Complexes 1-4 display heteroselective polymerization to give heterotactic-enriched PLAs with Pr values ranging from 0.64 to 0.74. The character of the ligand substituents from the two different phenolic rings and the complex fluxionality arising from the ligand interconversion are suggested to be responsible for the different levels of stereoselectivity and activity.
- Subjects
RING-opening polymerization; LACTIDES; LIGANDS (Chemistry); ALUMINUM compounds; POLYDISPERSE polymers; STEREOSELECTIVE reactions
- Publication
Macromolecular Chemistry & Physics, 2013, Vol 214, Issue 16, p1845
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201300333