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Living Polymerization of Lactide Using Titanium Alkoxide Catalysts
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2005
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Coordination Insertion MechanismMacromolecular ChemistryEngineeringOrganic ChemistryChemistryPolymersChemical EngineeringStereochemical MicrostructurePolymer ChemistryMaterials ScienceFunctional MaterialsCatalysisPolymer AnalysisPolymer SynthesisPolymer SciencePolymer CharacterizationPolymerization KineticsPolymer ReactionOpening Polymerization
Abstract 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.