In:
Polymers, MDPI AG, Vol. 12, No. 10 ( 2020-10-15), p. 2365-
Kurzfassung:
Chiral 4,8-diphenyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (DiPh-TBD) was synthesized and applied to a ring-opening polymerization of rac-lactide (rac-LA). The chiral DiPh-TBD promoted the synthesis of isotactic enriched polylactides (PLAs) with controlled molecular weight and narrow molecular weight distributions under mild, metal-free conditions. When the [rac-LA] /[Cat.] ratio was 100/1, full monomer conversion was achieved within only 1 min and a moderate probability of 0.67 meso dyads (Pm) was obtained at room temperature. A chain-end control mechanism (CEC) was found to be responsible for the isoselectivity based on the homodecoupled 1H NMR spectrum, the chiral HPLC measurement, and kinetic studies.
Materialart:
Online-Ressource
ISSN:
2073-4360
DOI:
10.3390/polym12102365
Sprache:
Englisch
Verlag:
MDPI AG
Publikationsdatum:
2020
ZDB Id:
2527146-5