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Alkaline Earth Metal‐Mediated Highly Iso‐selective Ring‐Opening Polymerization of rac ‐Lactide
Author(s) -
Bhattacharjee Jayeeta,
Harinath Adimulam,
Sarkar Alok,
Panda Tarun K.
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201901751
Subject(s) - polymerization , lactide , catalysis , ring opening polymerization , borane , metal , polymer chemistry , chemistry , alkaline earth metal , ligand (biochemistry) , materials science , polymer , organic chemistry , biochemistry , receptor
Alkaline earth (Ae) metal complexes of the aminophosphine borane ligand are highly active and iso‐selective catalysts for the ring‐opening polymerization (ROP) of rac ‐lactide (LA). The polymerization reactions are well controlled and produce polylactides with molecular weights that are precise and narrowly distributed. Kinetic studies reveal that the ROP of rac ‐LA catalyzed by all Ae metal complexes had a first‐order dependency on LA concentration as well as catalyst concentration. A plausible reaction mechanism for Ae metal complex‐mediated ROP of rac ‐LA is discussed, based on controlled kinetic experiments and molecular chain mobility.