Zwitterionic Copolymerization: Synthesis of Cyclic Gradient Copolymers

How to get rich fast: The zwitterionic copolymerization of δ‐valerolactone (VL) and ε‐caprolactone (CL) provides an expedient route to cyclic gradient copolymers. The faster ring‐opening of VL relative to CL with N‐heterocyclic carbenes, coupled with sufficiently long lifetimes of the growing zwitte...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2011-07, Vol.50 (28), p.6388-6391
Main Authors: Shin, Eun Ji, Brown, Hayley A., Gonzalez, Silvia, Jeong, Wonhee, Hedrick, James L., Waymouth, Robert M.
Format: Article
Language:English
Subjects:
block copolymers
copolymerization
lactones
ring-opening polymerization
zwitterions
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Summary:How to get rich fast: The zwitterionic copolymerization of δ‐valerolactone (VL) and ε‐caprolactone (CL) provides an expedient route to cyclic gradient copolymers. The faster ring‐opening of VL relative to CL with N‐heterocyclic carbenes, coupled with sufficiently long lifetimes of the growing zwitterions leads to a polymer structure comprised of VL‐rich sequences that transition to CL‐rich sequences in a cyclic macromolecule (see scheme).
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201101853