Living Polymerization of Lactide Using Titanium Alkoxide Catalysts |
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| Authors: | Youngjo Kim John G Verkade |
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| Institution: | 1. Department of Chemistry and Basic Science Research Institute, Chungbuk National University, Cheongju, Chungbuk 361-763 Korea, Fax: +82-43-267-2279;2. Department of Chemistry, Iowa State University, Ames, IA 50014, USA |
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| 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 1H 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. |
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| Keywords: | living polymerization polylactide ring opening polymerization tacticity titanium |
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