Tailor-made block copolymers of l-, d- and rac -lactides and ε-caprolactone via one-pot sequential ring opening polymerization by pyridylamidozinc(ii) catalysts

Three-coordinated Zn(ii) complexes bearing sterically encumbered bidentate monoanionic [ , ] pyridylamido ligands efficiently catalyze the ring opening polymerization of lactide (LA) and ε-caprolactone (CL). Owing to the polymerization controlled nature and high rate, precise stereodiblock poly(LLA-...

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Bibliographic Details
Published in:RSC advances 2019-10, Vol.9 (56), p.32771-32779
Main Authors: D'Auria, Ilaria, D'Alterio, Massimo Christian, Tedesco, Consiglia, Pellecchia, Claudio
Format: Article
Language:English
Subjects:
Block copolymers
Chemistry
Crystallography
Isotacticity
NMR
Nuclear magnetic resonance
Polymerization
Ring opening polymerization
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Summary:Three-coordinated Zn(ii) complexes bearing sterically encumbered bidentate monoanionic [ , ] pyridylamido ligands efficiently catalyze the ring opening polymerization of lactide (LA) and ε-caprolactone (CL). Owing to the polymerization controlled nature and high rate, precise stereodiblock poly(LLA- -DLA) with different block lengths can be easily produced by one-pot sequential monomer addition at room temperature in short reaction times. NMR, SEC and DSC analyses confirm the production of highly isotactic diblock copolymers which crystallize in the high melting stereocomplex phase. Stereo-triblock and tetrablock copolymers of l-LA, d-LA and -LA have been synthesized similarly. Finally, a diblock poly(CL- -LA) has been easily obtained by sequential addition of ε-caprolactone and lactide under mild conditions.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra07133d