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Living Polymerization of Lactide Using Titanium Alkoxide Catalysts
Author(s) -
Kim Youngjo,
Verkade John G.
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200550610
Subject(s) - lactide , alkoxide , polymerization , ring opening polymerization , homonuclear molecule , polymer chemistry , tacticity , materials science , titanium , catalysis , living polymerization , polymer , chemistry , radical polymerization , organic chemistry , molecule , composite material , metallurgy
Several titanium isopropoxides have facilitated the ring opening polymerization of l ‐lactide (LA) and rac ‐lactide in toluene solution at various polymerization temperatures via a coordination insertion mechanism. Depending on catalysts, the controlled/living poly( l ‐lactide), or the heterotactic‐biased poly( rac ‐lactide) were obtained. The stereochemical microstructure of polylactide (PLA) was determined from homonuclear decoupled 1 H NMR spectral studies. Such spectra of PLA derived from rac ‐LA featured the characteristic five‐methine resonance pattern, whereas corresponding spectra derived from l ‐LA exhibited only one methine peak.