Three-coordinated Zn(II) complexes bearing sterically encumbered bidentate monoanionic [N,N ] pyridylamido ligands efficiently catalyze the ring opening polymerization of lactide (LA) and 3- caprolactone (CL). Owing to the polymerization controlled nature and high rate, precise stereodiblock poly(LLA-b-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 rac-LA have been synthesized similarly. Finally, a diblock poly(CL-b-LA) has been easily obtained by sequential addition of 3- caprolactone and lactide under mild conditions.

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

D'Auria I.
Investigation
;
Tedesco C.
Investigation
;
Pellecchia C.
Writing – Original Draft Preparation
2019

Abstract

Three-coordinated Zn(II) complexes bearing sterically encumbered bidentate monoanionic [N,N ] pyridylamido ligands efficiently catalyze the ring opening polymerization of lactide (LA) and 3- caprolactone (CL). Owing to the polymerization controlled nature and high rate, precise stereodiblock poly(LLA-b-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 rac-LA have been synthesized similarly. Finally, a diblock poly(CL-b-LA) has been easily obtained by sequential addition of 3- caprolactone and lactide under mild conditions.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4729886
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 16
social impact