Lewis acid/base modulation in β-diiminate zinc-catalyzed switchable ring-opening polymerization of rac-lactide

Two β-diiminate zinc complexes were prepared and found to show high activity and well-controlled catalytic behavior in the ring-opening polymerization of rac -lactide. Coordination of the Lewis acid to the zinc complexes completely terminated the polymerization. The coordinated Lewis acid was easily...

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Bibliographic Details
Published in:Science China. Chemistry 2019-04, Vol.62 (4), p.475-478
Main Authors: Zhang, Pan, Zhao, Minhui, Pang, Wenmin, Chen, Changle
Format: Article
Language:English
Subjects:
Acids
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Lewis acid
Lewis base
Ligands
Nickel
Polymerization
Polymers
Ring opening polymerization
Science
Zinc
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Summary:Two β-diiminate zinc complexes were prepared and found to show high activity and well-controlled catalytic behavior in the ring-opening polymerization of rac -lactide. Coordination of the Lewis acid to the zinc complexes completely terminated the polymerization. The coordinated Lewis acid was easily cleaved by using a Lewis base, so that the polymerization could resume. Thus, switchable polymerization could be realized by the subsequent addition of a Lewis acid and a Lewis base. This work provides a new strategy to control the ring-opening polymerization of rac -lactide.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-018-9414-3